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Tytuł:
Densification and Magnetic Properties of Fe Powder Compacts According to Heat-Treatment Conditions
Autorzy:
Yoo, Hyo-Sang
Kim, Yong-Ho
Kim, Cheol-Woo
Son, Hyeon-Taek
Powiązania:
https://bibliotekanauki.pl/articles/2203721.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fe powder
heat-treatment
microstructure
density
Opis:
In this study, the effects of heat-treatment conditions of Fe powder compacts on densification, microstructure, strength and magnetic properties were investigated. The prepared Fe powder was compressed in a mold of diameter 20 mm at a pressure of 800 MPa for 30 sec. This Fe powder compact was heat-treated under different atmospheres (air and 90% Ar + 10% H2 and heat-treatment temperatures (300 and 700℃). The Fe powder compacts heat-treated in an Ar+H2 mixed gas atmosphere showed a denser microstructure and higher density than the Fe powder compacts heat-treated in an air atmosphere. Oxygen content in the heat-treatment conditions played a significant role in the improvement of the densification and magnetic properties.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 47--50
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Mechanical Alloying Parameters on Phase Formation in Al-Cu-Fe Powder
Autorzy:
Mitka, M.
Lityńska-Dobrzyńska, L.
Góral, A.
Maziarz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1375540.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.20.Ev
61.44.Br
61.05.cp
68.37.Hk
Opis:
In the present study the effect of mechanical alloying parameters on phase formation in $Al_{62}Cu_{25.5}Fe_{12.5}$ (at.%) alloy was investigated. Mixtures of Al, Cu and Fe powder with different particles size were ball milled in Fritsch 5 Pulverisette planetary mill using tungsten carbide vials and balls. The milling was performed with the rotation speed 250 and 300 rpm up to 40 h. Stearic acid or hexane were used as process control agent (PCA). The microstructure of the powders prepared with different milling parameters was investigated using X-ray diffraction and scanning electron microscopy. It was found that increase of the rotation speed as well as decrease of particle size of initial Al powder particles accelerates the formation of homogeneous microstructure of the powder. The mixture of icosahedral quasicrystal and β-Al(Cu, Fe) cubic phase has been obtained for the powders milled at 300 rpm up to 20 h. Prolonged milling time results in transformation to single ordered β phase.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 984-987
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Sintered Fe₅₀Co₅₀ Powder Cores
Autorzy:
Olekšáková, D.
Kollár, P.
Füzer, J.
Onderko, F.
Dobák, S.
Viňáš, J.
Fáberová, M.
Bureš, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032708.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Vv
85.70.-w
75.50.Bb
Opis:
We investigated coercivity, total losses and complex permeability of sintered Fe-Co powder cores to detect magnetization processes performing in ac magnetic field. The Fe-Co solid solution alloy powders with 50:50 wt% ratio were prepared by 1, 15, and 20 h alloyed mixture of pure chemical elements in planetary ball mill. The resulting powder was subsequently sintered into a disk form. The compaction was performed at a pressure of 800 MPa for 5 min at temperatures of 400°C, 500°C and 600°C in vacuum oxidation protective atmosphere, with pressure of 5×10¯³ Pa. The best magnetic properties exhibit sample prepared from 1 h alloyed powder, compacted at 600°C.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 807-809
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consolidation of Nanocrystalline Nd-Fe-B Powder by Hydrostatic Extrusion at High Temperature
Autorzy:
Gizynski, T.
Kaszuwara, W.
Kulczyk, M.
Leonowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030247.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ww
Opis:
Hydrostatic extrusion is a modern method of shaping material microstructure and properties. Hydrostatic extrusion can also be successfully used for consolidation of hard magnetic powders. The effect of extrusion temperature, within the range of 700-800°C, on the magnetic properties of the bulk, final product was studied. A commercial MQU-F42 powder, dedicated to hot pressing, was placed in copper capsules and initially cold compacted up to 60% of the theoretical density. Subsequently, the billet was heated in an oven to temperatures 700 and 800°C, respectively and subjected to hydrostatic extrusion. The extruded product had a form of a copper rod, with the Nd-Fe-B core, having 96% of theoretical density (true strain 1.85 after extrusion at 800°C). The extrusion process led to deterioration of the coercivity, for which coarsening of the Nd₂Fe₁₄B grains was blamed. In order to prove this hypothesis, the starting powder was annealed in a temperature range of 550-900°C for various times. The crystallite size, measured after annealing by the X-ray diffraction method, showed that with extension of time and elevation of the temperature the crystallite size increases, however the dominating parameter is the temperature. Correlation of the crystallite size with temperature indicates that when the crystallites are larger than 80 nm the magnetic properties dramatically decrease. Additionally, after HE at 800°C micrometric size Nd-rich phase appear in the microstructure. The Nd is squeezed from the grain boundary of the Nd₂Fe₁₄B phase leading to non-isolated grains, which also contributes to the deterioration of the coercivity.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1260-1263
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Properties of Magnets Obtained by Hydrostatic Extrusion of Nd-Fe-B Powder
Autorzy:
Gizynski, T.
Kaszuwara, W.
Pawlik, P.
Kulczyk, M.
Leonowicz, M.
Michalski, B.
Powiązania:
https://bibliotekanauki.pl/articles/1387955.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ww
Opis:
Nd-Fe-B MQ powder was initially densified in a copper capsule to reach about 60% of the theoretical density. Subsequently, three various processes of hydrostatic extrusion were conducted at room temperature. The values of true strain, obtained during the all three stages, were 1.38, 0.89, 0.94, respectively. The investigation performed showed that the coercivity of the material decreases as the strain increases. Decrease of the remanence was observed only for the highest strains. Size of the particles was strongly reduced during the extrusion processes. X-ray diffraction did not show changes in the phase structure of the material. The Mössbauer study, of the sample extruded within all the three stages, showed existence of the Nd₂Fe₁₄B phase and 16% of other phase. Analysis of magnetization versus temperature confirmed that the additional phase was ferromagnetic.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 626-628
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imaging of Magnetic Domains and Domain Walls in Spherical Fe-Si Powder Using Magnetic Force Microscopy
Autorzy:
Strečková, M.
Baťková, M.
Baťko, I.
Hadraba, H.
Bureš, R.
Powiązania:
https://bibliotekanauki.pl/articles/1367241.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.60.Ch
75.70.Kw
Opis:
The commercial Fe-Si powder, produced by Högänes Corporation, represents promising soft magnetic material for technological applications. The powder consists of spherical particles with diameter up to 150 μm. Internal microstructure of the powder is formed by grains of diameter of about 30 μm. Each separate grain has a random orientation of the easy magnetization axis and is sufficiently large to split into several magnetic domains. A comparative study of the atomic force microscopy (AFM) topography and the corresponding magnetic force microscopy (MFM) images was employed in order to examine the correlation between the grain size, boundaries of grains and characterization of the magnetic domains, which gives us an important knowledge about possible behavior of particles under the influence of the external magnetic field and further utilization of the spherical Fe-Si particles in electrotechnical industry. The grain size and the crystallographic orientation of grains were analyzed by the electron backscattering diffraction (EBSD) technique.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 92-93
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon Co-Deposition During Gas Reduction of Water-Atomized Fe-Cr-Mo Powder
Autorzy:
Ali, B.
Choi, S. H.
Seo, S. J.
Maeng, D. Y.
Lee, C. G.
Kim, T. S.
Park, K. T.
Powiązania:
https://bibliotekanauki.pl/articles/352709.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
water atomization
Fe-based powder
oxide reduction
powder metallurgy
sinter-hardening alloys
Opis:
The water atomization of iron powder with a composition of Fe-3Cr-0.5Mo (wt.%) at 1600°C and 150 bar creates an oxide layer, which in this study was reduced using a mixture of methane (CH4) and argon (Ar) gas. The lowest oxygen content was achieved with a 100 cc/min flow rate of CH4, but this also resulted in a co-deposition of carbon due to the cracking of CH4. This carbon can be used directly to create high-quality, sinter hardenable steel, thereby eliminating the need for an additional mixing step prior to sintering. An exponential relationship was found to exist between the CH4 gas flow rate and carbon content of the powder, meaning that its composition can be easily controlled to suit a variety of different applications.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1119-1124
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Transition Metals on Quasicrystalline Phase Formation in Mechanically Alloyed Al65Cu20Fe15 Powder
Autorzy:
Mitka, M.
Kalita, D.
Góral, A.
Lityńska-Dobrzyńska, L.
Powiązania:
https://bibliotekanauki.pl/articles/351525.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical alloying
quasicrystal
Al-Cu-Fe
transition metals
Opis:
The effect of replacing iron with transition metals (M = Mn, Cr, Co) on the microstructure of mechanically alloyed Al65 Cu20 Fe15 quasicrystalline powder was examined by X-ray diffraction and transmission electron microscopy methods. Powders of various compositions were milled in a high-energy planetary ball mill up to 30 hours at a rotation speed 350 rpm using WC milling media. The amount of the fourth additions was constant in all powders and Fe atoms were replaced with Mn, Cr or Co in a 1:1 ratio, while the content of the Al and Cu was selected in two ways: they remained the same as in the initial ternary Al65 Cu20 Fe15 alloy or changed to obtain e/a ratio = 1.75 (optimal for icosahedral quasicrystalline phase). Quasicrystalline phase formed in the quaternary Al65 Cu20 Fe7.5 M7.5 powders, whereas in the second group of compositions only crystalline phases were identified.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1129-1133
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Post-Heat Treatment on Microstructure and Mechanical Properties of Cu-Fe-Co Powder Alloy Fabricated by Hot Pressing
Autorzy:
Çelik, E.
Aslan, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/353200.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
diamond cutting tools
Cu-Fe-Co alloy
powder metallurgy
hot pressing
heat treatment
Opis:
In this study, the powder mixture which consists of Cu-Fe-Co was produced by using the method of hot pressing technique. In addition, effect of heat treatment process on microstructure and mechanical properties of this alloy was investigated. Following the hot pressing process applied on the samples, heat treatment was carried out at 950°C for two different dwelling times (90 and 180 minutes). Measured density values were considered as physical characteristics, while hardness and fracture strength values were considered as mechanical characteristics. It was observed that porosity rates of hot pressed samples were decreased by increasing of temperature and pressing parameters. In this study it was observed that Cu was spread in matrix and filled the micro porosities. Hardness values were determined to be decreased as a result of grain growth after heat treatment process. That 4 fold increased elongation % values which were achieved by TRS experiments were observed as well.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 371-377
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterization of Fe/$SiO_{2}$ Powder Composites Using Impregnation Method
Autorzy:
Kabátová, M.
Füzer, J.
Füzerová, J.
Dudrová, E.
Kollár, P.
Powiązania:
https://bibliotekanauki.pl/articles/1367476.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
77.84.Lf
75.60.Ej
Opis:
Fe/$SiO_{2}$ powder composite materials based on irregularly and/or spherically shaped iron powder particles with an addition of $SiO_{2}$ nanopowder were prepared in two ways, (i) by mixing the Fe/$SiO_{2}$ powder with 1.0 wt.% of Shellac dissolved in ethanol and (ii) by vacuum/pressure impregnation of low-temperature sintered Fe/$SiO_{2}$ components with shellac dissolved in ethanol and with thermoplast SL450. $SiO_{2}$ was implemented either as nanopowder or by sol-gel coating. Vacuum/pressure impregnation (VPI) of pre-sintered samples was performed in a steel container. The influence of iron particle shape and processing conditions on the electro-insulating layer was microscopically evaluated and correlated with the values of the electrical resistivity and coercivity. It has been found that the continuity, distribution and thickness of insulating phase is strongly controlled by the shape of iron particles. Using the VPI procedure, the irregular surface of iron particles may cause discontinuities of insulating layer, while the spherical iron particles are well covered with continuous evenly distributed insulating layer.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 134-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Application of a Ball-milled Fe-Cu-Ni Powder Mixture to Fabricate Sintered Diamond Tools
Autorzy:
Borowiecka-Jamrożek, J.
Konstanty, J.
Lachowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/383184.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
mechanical properties
sintered diamond tools
powder mixtures
hot pressing
metalografia
właściwości mechaniczne
narzędzia diamentowe
prasowanie na gorąco
Opis:
This article discusses results of an analysis of mechanical properties of a sintered material obtained from a mixture of elemental iron, copper and nickel powders ball milled for 60 hours. The powder consolidation was performed by hot pressing in a graphite mould. The hot pressing was carried out for 3 minutes at 900 °C and under a pressure of 35 MPa. The sintered specimens were tested for density, porosity, hardness and tensile strength. Their microstructures and fracture surfaces were also examined using a scanning electron microscope (SEM). The study was conducted in order to determine the suitability of the sintered material for the manufacture of metal-bonded diamond tools. It was important to assess the effects of chemical composition and microstructure of the sintered material on its mechanical properties, which were compared with those of conventional metal bond material produced from a hot-pressed SMS grade cobalt powder. Although the studied material shows slightly lower strength and ductility as compared with cobalt, its hardness and offset yield strength are sufficiently high to meet the criteria for less demanding applications.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 5-8
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adhesion of the powder flame sprayed coatings using Fe-Cr-Co-Mo powder
Autorzy:
Rzeźnikiewicz, A.
Cetnarowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/115133.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
natryskiwanie płomieniowo-proszkowe
powłoka natryskiwana
siła przyczepności
modyfikacja powierzchni
powder flame spraying
spraying coating
adhesion strength
surface modification
Opis:
The aim of the research was to assess the adhesion of the powder flame sprayed coatings to the previously prepared substrate. The spraying tests were carried out using Rototec 51000 base powders which was Ni-Al-Mo alloys, then coated with an outer coating made of Rototec 19404, which is an alloy Fe-Cr-Co-Mo. The coatings were tested for adhesion in accordance with the PN-EN ISO 14916:2017 standard and also topography tests of sprayed coatings using scanning electron microscopy.
Źródło:
Welding Technology Review; 2018, 90, 11; 16-19
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics Of The Porous Body Sintered By Nano-Sized Fe-Cr-Al Alloy Powder
Charakterystyka porowatego korpusu spiekanego z nanometrycznego proszku stopu Fe-Cr-Al
Autorzy:
Lee, S.-I.
Lee, S.-H.
Gu, B.-U.
Lee, D.-W.
Kim, B.-K.
Powiązania:
https://bibliotekanauki.pl/articles/356635.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fe-Cr-Al powder
metallic sponges
sintering temperature
oxidation resistance
proszek Fe-Cr-Al
proszek nanometryczny
temperatura spiekania
odporność na utlenianie
Opis:
Porous metal with uniform honeycomb structure was successfully produced by sintering using Fe-Cr-Al nano powder, which was prepared by the pulsed wire evaporation (PWE) in ethanol. Its process consisted of the several steps; 1) coating on the surface of polyurethane sponge with the liquid droplets generated from the ethanol-based slurry where the Fe-Cr-Al nano powders were uniformly dispersed, 2) heat treatment of debinding to remove the polyurethane sponge and 3) sintering of the porous green body formed by Fe-Cr-Al nano powders. The strut thickness of porous Fe-Cr-Al was increased by the increase of spraying times in ESP step. Also, The shrinkages and the oxidation resistance of the sintered porous body was increased with increase of sintering temperature. The optimal sintering temperature was shown to 1450°C in views to maximize the oxidation resistance and sinterability.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1275-1279
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Al-Fe sinters made by the powder metallurgy route
Charakterystyka spieków Al-Fe wytworzonych metodą metalurgii proszków
Autorzy:
Majchrowska, M.
Lasek, K.
Nowak, M.
Pałka, P.
Sułkowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/264175.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Al/Fe sinters
powder metallurgy
interface
intermetallic compounds
microstructure
spieki Al/Fe
metalurgia proszków
interfejs
związki międzymetaliczne
mikrostruktura
Opis:
The Al/Fe material was prepared by the powder metallurgy route with an additional intermediate stage which was a centrifuge of powder mixture. The application of the centrifuge stage was applied to obtain circular phase distribution of Al-rich phases in a sintered material. Iron powder with a particle size under 100 μm and aluminum powder with a particle size of about 25 μm, were used as starting materials. To determine the effect of centrifuging time on the distribution of Fe-Al particles, scanning electron microscopy (SEM, EDS) and XRD techniques were used. Microstructure observations show the influence of the centrifuging time on the distribution of Fe particles. It was observed that a longer centrifuging time caused changes in the ratio concentration of elements and allowed the growth of the intermetallic phase at the interface between solid Al and Fe particles.
Spiekane materiały Al/Fe wytwarzano metodą metalurgii proszków z wprowadzeniem etapu pośredniego w postaci odwirowania mieszaniny proszku. Etap wirowania miał na celu uzyskanie kulistego rozkładu faz bogatych w Al w spiekanym materiale. Proszek żelaza o wielkości cząstek poniżej 100 μm i proszek aluminium o wielkości cząstek około 25 μm zastosowano jako materiały wyjściowe. W celu określenia wpływu czasu wirowania mieszanki na rozkład faz w wytworzonym materiale zastosowano techniki skaningowej mikroskopii elektronowej (SEM, EDS) i dyfraktometrii rentgenowskiej (XRD). Obserwacje mikrostruktury wykazały istotny wpływ czasu wirowania na mikrostrukturę uzyskanych spieków. Zaobserwowano, że dłuższy czas wirowania spowodował zmianę stosunku stężenia pierwiastków i pozwolił na wzrost fazy międzymetalicznej na granicy faz między stałymi cząstkami Al i Fe. Badania mikrotwardości obszarów spiekanego materiału świadczą o zwiększeniu twardości w obszarach nowo utworzonych faz międzymetalicznych.
Źródło:
Metallurgy and Foundry Engineering; 2018, 44, 4; 195-203
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manufacturing And High Temperature Oxidation Properties Of Electro-Sprayed Fe-24.5% Cr-5%Al Powder Porous Metal
Wytwarzanie i wysokotemperaturowe utlenianie elektro-rozpylanego porowatego proszku Fe-24.5% Cr-5%Al
Autorzy:
Lee, K-A.
Oh, J-S.
Kong, Y-M.
Kim, B-K.
Powiązania:
https://bibliotekanauki.pl/articles/350912.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder porous metal
electro-spray process
electric wire explosion
Fe-24Cr-5Al
high temperature oxidation
porowaty proszek metalu
elektrorozpylanie
utlenianie wysokotemperaturowe
Opis:
Fe-Cr-Al based Powder porous metals were manufactured using a new electro-spray process, and the microstructures and high-temperature oxidation properties were examined. The porous materials were obtained at different sintering temperatures (1350°C, 1400°C, 1450°C, and 1500°C and with different pore sizes (500 μm, 450 μm, and 200 μm). High-temperature oxidation experiments (TGA, Thermal Gravimetry Analysis) were conducted for 24 hours at 1000°C in a 79% N2+ 21% O2, 100 mL/min. atmosphere. The Fe-Cr-Al powder porous metals manufactured through the electro-spray process showed more-excellent oxidation resistance as sintering temperature and pore size increased. In addition, the fact that the densities and surface areas of the abovementioned powder porous metals had the largest effects on the metal’s oxidation properties could be identified.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1169-1173
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Evolution of Sinter-Forged Fe-Cr-Mo-C Alloy Depending on Cu Addition
Autorzy:
Oh, Min Chul
Kim, Moontae
Lee, Jisung
Ahn, Byungmin
Powiązania:
https://bibliotekanauki.pl/articles/355446.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Astaloy CrL
Fe-based alloy
pre-alloyed powder
powder forging
microstructure
Opis:
Pre-alloyed Astaloy CrLTM (Fe-1.5 wt% Cr-0.2 wt% Mo), a commercial Fe-based alloy powder for high strength powder metallurgy products, was sintered and hot forged with additions of 0.5 wt% C and 0~2 wt% Cu. To investigate the influence of various Cu contents, the microstructural evolution was characterized using density measurements, scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). Transverse rupture strength (TRS) was measured for each composition and processing stage. The correlation between Cu additions and properties of sinter-forged Fe-Cr-Mo-C alloy was discussed in detail.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 539-542
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Powder Size on the Microstructure and Magnetic Properties of Nd-Fe-B Magnet Alloy
Autorzy:
Cho, Ju-Young
Abbas, Sardar Farhat
Choa, Yong-Ho
Kim, Taek-Soo
Powiązania:
https://bibliotekanauki.pl/articles/353634.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Nd-Fe-B
gas atomization
powder size
crystal orientation
hot deformation
Opis:
Rare earth Nd-Fe-B, a widely used magnet composition, was synthesized in a shape of powders using gas atomization, a rapid solidification based process. The microstructure and properties were investigated in accordance with solidification rate and densification. Detailed microstructural characterization was performed by using scanning electron microscope (SEM) and the structural properties were measured by using X-ray diffraction. Iron in the form of α-Fe phase was observed in powder of about 30 μm. It was expected that fraction of Nd2 Fe14 B phase increased rapidly with decrease in powder size, on the other hand that of α-Fe phase was decreased. Nd-rich phase diffused from grain boundary to particle boundary after hot deformation due to capillary action. The coercivity of the alloy decreased with increase in powder size. After hot deformation, Nd2 Fe14 B phase tend to align to c-axis.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 623-626
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Particle Size of a Powder upon the Properties and Microstructure of Boron-modified Fe-Ni-Mo-Cu Sinters
Autorzy:
Karwan-Baczewska, Joanna
Perek-Nowak, Małgorzata
Majchrowska, Magdalena
Rosso, Mario
Powiązania:
https://bibliotekanauki.pl/articles/2201983.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
processing
powder metallurgy
Distaloy SA powder
activated sintering
particle fraction
Opis:
The article discusses the effect of different particle fractions of prealloyed iron powder on the microstructure, density and hardness of sintered material. Each particle fraction (apart from 160–200 µm, which is a trace fraction) was modified with boron, its contents being, respectively, 0.2 wt.%, 0.4 wt.% and 0.6 wt.%. Next, the powder mixtures were pressed under a pressure of 600 MPa, and the final compacts were subject to sintering at 1200°C for 60 min in a hydrogen atmosphere. It was observed that the higher values of density and hardness were found in samples made from finer fractions of powder. A higher homogeneity of the microstructure and the highest degree of compactness was obtained in sinters from powder of 40–56 µm particle size, with 0.4 wt.% boron. Due to the use of small particle fractions of prealloyed powder, a higher degree of compactness in sinters was obtained with lower boron content. Also indicated was which particle fraction of Fe-Ni-Mo-Cu powder should be applied to obtain density in sinters with boron addition equal to almost 100% of the relative density of the analyzed alloy. The presented studies have both scientific and technological aspects.
Źródło:
Journal of Casting & Materials Engineering; 2023, 7, 1; 1--8
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Powder Particle Biencapsulation with Ni-P Layer on Local Corrosion of Bonded Nd-(Fe,Co)-B Magnetic Material
Bienkapsulacja cząstek proszku powłokami Ni-P jako sposób poprawy odporności wiązanych magnesów Nd-(Fe,Co)-B na korozję lokalną
Autorzy:
Klimecka-Tatar, D.
Pawłowska, G.
Sozańska, M.
Powiązania:
https://bibliotekanauki.pl/articles/352049.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Nd-Fe-B bonded magnets
biencapsulation
local corrosion
Ni-P layers
magnes wiązany
bienkapsulacja
korozja
powłoki Ni-P
Opis:
Effect of the Nd-(Fe,Co)-B powder particle biencapsulation with Ni-P layer on bonded magnetic materials corrosion behaviour has been investigated. Bonded magnets were prepared from single-phase, nanocrystalline magnetic Nd11 Fe77 Co5 B6 powder. Powder particles before consolidation were preliminary etched and then coated with bilayer (powder biencapsulation). The powder surface was coated as a first with autocatalytic applied Ni-P layer during 5, 15 and 30 minutes in Ni(II) containing bath and the second layer was thermosetting epoxy-resin. Impact of the used biencapsulation process was rated on the basis of polarization curves recorded in phosphate environment with addition of chloric ions. It has been established that the used biencapsulation method satisfactorily isolate individual particles of the powder and consequently, significantly inhibits corrosion processes of the final material, especially in passivating environment containing Cl-.
W pracy zaprezentowano wyniki badań nad wpływem bienkapsulacji cząstek proszku powłokami Ni-P/żywica epoksy-dowan na odporność korozyjną magnesów wiązanych. Materiały magnetyczne zostały przygotowane z jednofazowego, na-nokrystalicznego proszku Nd11 Fe77 Co5 B6. Cząstki proszku przed konsolidacją były wstępnie trawione, a następnie pokryte podwójną warstwą (bienkapsulacja proszku). Powierzchnia proszku w pierwszej kolejności została poddana 5 i 30 minutowemu autokatalitycznemu nanoszeniu warstw Ni-P. Drugą warstwę stanowił materiał spoiwa, czyli żywica epoksydowa. Dokonano oceny wpływu zastosowanej metody bienkapsulacji na odporność na korozję lokalną na podstawie krzywych polaryzacji zarejestrowanych w środowisku fosforanowym (0,5M, pH = 3) z dodatkiem jonów chlorowy. Stwierdzono, że zastosowane metody bienkapsulacji zadowalająco izolują pojedyncze cząstki proszku, a co za tym idzie, hamują proces korozji materiału końcowego, zwłaszcza w środowisku pasywującym zawierającym Cl- .
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 1; 153-157
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of Fe-Ni-Al-Si Alloys Produced by Powder Metallurgy
Autorzy:
Novák, P.
Mejzlíková, L.
Hošek, V.
Martínek, M.
Marek, I.
Michalcová, A.
Powiązania:
https://bibliotekanauki.pl/articles/1418514.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Dk
62.20.Qp
Opis:
Reactive sintering powder metallurgy is a simple alternative to conventional melting and powder metallurgy processes. During this process, pressed powder mixture of pure metals or other precursors is transformed into bulk intermediary phases by thermally activated in situ reaction. This process was previously tested on Fe-Al and Fe-Al-Si alloys. Positive effect of silicon on the reactive sintering behaviour was determined, leading to the development of novel carbon-free high-silicon FeAl20Si20 alloy (given in wt%). In this work, the effect of nickel on the pressureless reactive sintering of Fe-Al-Si pressed powder mixtures was studied. To explain the nickel influence, differential thermal analysis was utilized. Microstructure, phase composition and porosity of the FeAl20Si20Nix (x = 0, 5, 10, 20 wt%) alloys was described. Hardness, wear resistance, high-temperature oxidation resistance and thermal stability were evaluated as functions of nickel content. Results showed that porosity decreases with growing nickel content down to less than 3 vol.%. Oxidation rate of these alloys is more than 10 times lower than that of original FeAl20Si20 alloy. Thermal stability and abrasive wear resistance of these alloys is also superior to Fe-Al and Fe-Al-Si materials.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 524-527
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Mechanical Activation on the in situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB
Autorzy:
Huynh, X.-K.
Kim, B.-W.
Kim, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/355844.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical activation
in situ formation
TiB2 particulate
Fe-matrix
specific ball-milling energy
Opis:
The in situ formation of TiB2 particulates via an interface reaction between Ti and FeB powders was studied. The effects of mechanical activation by high-energy milling on the decomposition of TiH2 and the interface reactions between Ti and FeB powders to form TiB2 were investigated. Powder mixtures were fabricated using planetary ball-milling under various milling conditions. The specific ball-milling energy was calculated from the measured electrical power consumption during milling process. High specific milling energy (152.6 kJ/g) resulted in a size reduction and homogeneous dispersion of constituent powders. This resulted in a decrease in the decomposition temperature of TiH2 and an increase in the formation reaction of TiB2 particulates in the Fe matrix, resulting in a homogeneous microstructure of nanoscale TiB2 evenly distributed within the Fe matrix. In contrast, the powder mixture milled with low specific milling energy (36.5 kJ/g) showed an inhomogeneous microstructure composed of relatively large Fe-Fe2 B particles surrounded by a thin layer of Fe-TiB2 within a finely dispersed Fe-TiB2 matrix region.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1393-1398
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Adding Iron Powder From Plasma Cutting on the Microstructure, Mechanical Properties of the Composite Based on Aluminum Powder Matrix Made Using Powder Metallurgy
Autorzy:
Wędrychowicz, M.
Bydałek, A. W.
Migas, P.
Skrzekut, T.
Noga, P.
Madej, P.
Kałasznikow, A.
Powiązania:
https://bibliotekanauki.pl/articles/2049543.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Fe composite
iron powder
plasma cutting
aluminum matrix composites
powder metallurgy
mechanical properties
Opis:
The paper presents the results of research on the effect of added iron powder from plasma cutting on the mechanical properties and structure of a composite rod based on aluminum powder. The iron powder came from plasma cutting of steel elements and was handed over by the enterprise “AK Anatol” from Żary. One of the ways to dispose of it is to use it as a filler in aluminum composite rods. Research shows that Fe can be distributed in aluminum evenly, and increase in mechanical properties is achieved at the expense of only a slight increase in density. The proposed system does not reduce the amount of waste produced by plasma cutting but finds a use for some of it. The sintering point of the powder required a strongly reducing atmosphere (Po2 < 10-50 atm) which seems virtually unachievable under laboratory conditions. The reinforcing mechanism is related to the fragmentation of the matrix aggregate particles and the uniform distribution of Fe particles in the aluminum matrix.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 273-279
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of Iron and Aluminium Powder Pressing on the Course of Shrinkage and Properties of the Fe40Al Phase Obtained by Reaction Sintering
Autorzy:
Berendt-Marchel, M.
Siemiaszko, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/2048785.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
intermetallic
powder metallurgy
reaction sintering
mechanical properties
Opis:
The effect of the compaction rate on the structure, microstructure and properties of Fe-Al sinters obtained during the SHS reaction is presented in this paper. It was found that increasing the uniaxial pressing pressure led to the increase of the contact area between iron and aluminium particles, which improved the conduction and lowered heat losses during the self-propagating high-temperature synthesis (SHS) reaction and thus result with a sintered material with an improved phase homogeneity. On the other hand, an increase in the pressing pressure causes air be trapped in the pores and later on reacts with iron and aluminium to form oxides. In this work, the shrinkage course was analysed at six different pressing pressures: 50, 100, 150, 200, 300 and 400 MPa. The green compacts were then subjected to the PAIS process (pressure-assisted induction sintering) at a temperature of 1000°C under a load of 100 kN for 5 min. Such prepared samples were subjected to density, porosity, and microhardness (HV0.1) measurements. X-ray diffraction phase analysis and SEM observations were performed together with EDS chemical composition measurements. For studied chemical composition of the samples and sample geometry, 200 MPa compacting pressure was found to be optimal in order to obtain the best sample homogeneity.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 121-126
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of wear mechanisms in sintered Fe-1.5 Wt % Cu alloys
Charakterystyka mechanizmów zużycia spiekanych stopów Fe-1.5Cu
Autorzy:
Mazahery, A.
Shabani, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/354551.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
właściwości tribologiczne
proszki spiekane
porowatość
tribological properties
powder processing
porosity
Opis:
In this research, increasing amount of ultimate tensile strength and hardness in sintered Fe-1.5 Wt % Cu alloys is observed with increasing the density. The influence of different applied pressure of 300, 450, 600 and 750 MPa on porosity and wear behavior has been also studied. Cross-section micrographs of worn surfaces show that the pores are closed by plastic deformation or oxides and metallic particles after the wear test. According to the wear test results, specimens with 14 vol. % porosity are more wear resistant than the specimens with low porosity values of 11 vol. %. Thus, oxidation wear and surface plastic deformation are the main wear mechanisms identified in this investigation. Abrasion wear was also characterized as the result of abrasive debris agglomeration and the asperities of the pins.
Obserwowano wzrost wytrzymałości na rozciąganie i twardości spiekanych stopów Fe-1.5Cu (% wag) wraz ze wzrostem ich gęstości. Badano także wpływ różnych wartości ciśnienia 300, 450, 600 i 750 MPa na porowatość i zużycie stopów. Mikrofotografie przekrojów zużytych powierzchni pokazują, że po teście zużycia pory są zamknięte wskutek odkształcenia plastycznego lub przez tlenki i cząstki metaliczne. Według wyników badań zużycia próbki o porowatości 14% są bardziej odporne na zużycie niż próbki o niższej porowatości 11%. Utlenianie i odkształcenie plastyczne powierzchni to główne mechanizmy zużycia zidentyfikowane w tej pracy. Stwierdzono także, że ścieranie jest wynikiem aglomeracji ściernych drobin i nierówności pinów.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 1; 93-103
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odporne na zużycie powłoki eutektyczne układu Fe-Mn-C-B-Si-Ni-Cr otrzymane metodą napawania z wykorzystaniem drutów proszkowych
Wear resistance of eutectic coating of system Fe-Mn-C-B-Si-Ni-Cr obtained by welding method with use wire powder
Autorzy:
Pashechko, M.
Kindraczuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/395262.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
powłoki eutektyczne
druty proszkowe
napawanie
eutectic coating
wire powder
welding method
Opis:
W artykule omówiono właściwości tribologiczne powłoki eutektycznej na bazie układu Fe-Mn-C-B-Si-Ni-Cr otrzymanej metodą napawania łukowego w osłonie gazowej GMA z użyciem drutu proszkowego. Badanie przeprowadzono dla próbek z powłoką eutektyczną w układzie trzpień-tarcza podczas ruchu ślizgowego na sucho dla prędkości 0,4 m/s przy przyłożonych obciążeniach 3, 7 i 10 MPa. Materiał przeciwpróbki stal C 45. Po tarciu strukturę i rozkład atomów na powierzchni powłoki eutektycznej badano z użyciem skaningowego mikroskopu elektronowego SEM. Na podstawie uzyskanych wyników badań zaproponowano mechanizm zużycia opracowanych materiałów kompozytowych eutektycznych. W procesie tarcia występuje segregacja atomów C, B i Si na powierzchniu tarcia, spowodowana termodyfuzją, aktywizowana cyklicznym rozgrzewaniem powierzchni tarcia. Wskutek tribosyntezy powstają fazy nanokrystaliczne, które powodują zwiększenie odporności na zużycie kompozytów eutektycznych. Mechanizm tarcia jest utleniający.
Wear resistance of eutectic coating of system Fe-Mn-C-B-Si-Ni-Cr obtained by welding method with use wire powder was studied. The coating were obtained by gas metal arc welding GMA with use of wire powder. Pin-on-disk dry sliding wear tests at sliding speeds 0,4 m/s and under loads 3, 7, 10 MPa were conducted for pin specimens with eutectic coatings. Material of counter-sample was steel C 45. After friction structure and distribution of atoms in the eutectic coatings due to wear was studied by scanning electron microscopy (SEM). Segregation of the C, B and Si caused of the thermal diffusion, activated by of the friction heating of the friction surface. Tribosyntese arise as a result of nanocrystalline phase, which increase the wear resistance of composites eutectic. The mechanism of friction is oxidizing
Źródło:
Postępy Nauki i Techniki; 2010, 5; 156-161
2080-4075
Pojawia się w:
Postępy Nauki i Techniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 45

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