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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:
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:
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:
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:
Determination of Ignition Sensitivity of Selected Heat Powders
Autorzy:
Czajka, B.
Styczyński, S.
Tabat, S.
Szal, D.
Wachowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/357966.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
heat powder
ignition sensitivity
Fe-KClO4
EDS test
Opis:
Ignition sensitivity is one of the factors defning the characteristics of high calorifc mixture with low emission of gaseous product. It was found that Zr-BaCrO4 mixture is sensitive to ignition by electric spark energy of 0.82 J, whereas activation of Fe-KClO4 mixture depends on the iron powder employed and the composition of its surface oxide layers. Energy required for the activation of high calorifc mixture in form of powder designated as FeK, FeR or FeE is equal to 0.08, 0.59 and 1.1 J, while in the form of pellet 6.92, 10.2 and 14.1 J. Activation of Fe-KClO4 mixture with a strip of heat paper as well as with the electric spark has revealed that the mixture containing iron powder obtained by atomization method (FeA) is not active.
Źródło:
Central European Journal of Energetic Materials; 2011, 8, 1; 3-13
1733-7178
Pojawia się w:
Central European Journal of Energetic 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:
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:
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:
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:
Microstructure and Magnetic Properties of NdFeB Sintered Magnets Diffusion-Treated with Cu/Al Mixed Dyco Alloy-Powder
Autorzy:
Lee, M.-W.
Bae, K.-H.
Lee, S.-R.
Kim, H.-J.
Jang, T.-S.
Powiązania:
https://bibliotekanauki.pl/articles/353351.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Nd-Fe-B sintered magnets
grain boundary diffusion process
low melting point element
DyCo alloy-powder diffusion
Opis:
We investigated the microstructural and magnetic property changes of DyCo, Cu + DyCo, and Al + DyCo diffusion-treated NdFeB sintered magnets. The coercivity of all diffusion treated magnet was increased at 880ºC of 1st post annealing(PA), by 6.1 kOe in Cu and 7.0 kOe in Al mixed DyCo coated magnets, whereas this increment was found to be relatively low (3.9 kOe) in the magnet coated with DyCo only. The diffusivity and diffusion depth of Dy were increased in those magnets which were treated with Cu or Al mixed DyCo, mainly due to comparatively easy diffusion path provided by Cu and Al because of their solubility with Ndrich grain boundary phase. The formation of Cu/Al-rich grain boundary phase might have enhanced the diffusivity of Dy-atoms. Moreover, relatively a large number of Dy atoms reached into the magnet and mostly segregated at the interface of Nd2 Fe14 B and grain boundary phases covering Nd2 Fe14 B grains so that the core-shell type structures were developed. The formation of highly anisotropic (Nd, Dy)2Fe14B phase layer, which acted as the shell in the core-shell type structure so as to prevent the reverse domain movement, was the cause of enhancing the coercivity of diffusion treated NdFeB magnets. Segregation of cobalt in Nd-rich TJP followed by the formation of Co-rich phase was beneficial for the coercivity enhancement, resulting in the stabilization of the metastable c-Nd2O3 phase.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1263-1266
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of the Surface of the Iron Powder as an Ingredient of the High Calorific Mixture
Autorzy:
Czajka, B.
Wachowski, L.
Łapiński, A.
Rzodkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/358561.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
iron powder
Fe-KClO4 mixture
Raman spectroscopy (RS)
ellipsometry
thermo-programmed reduction (TPR)
thermogravimetric analysis
TG/DTA
Opis:
Textural properties of iron powders obtained by reduction of iron(II) compounds and by electrolysis were determined. Their specific surfaces were 0.38 and 0.43 m2g-1 respectively, and the prevailing grain sizes amounted to 10 and 43 ?m respectively. Total content of the determined metallic impurities was 0.055 wt.% in the preparation obtained by the electrolysis while in the preparation obtained by reduction it was 0.025 wt.%. It was proved that in initial samples the α-Fe2O3 phase occurred in the outer oxide layer present on the surface of Fe grains, and below this phase a layer of magnetite was found, the thickness of which was considerably greater in iron obtained by electrolysis. Measurements of selected properties showed that modification of the iron powder surface carried out by reduction with dihydrogen led to decreasing the linear rate of burning of the high calorific mixture Fe/KClO4 but it did not affect its calorific value. Moreover, it was found that modification of the iron powder surface resulted in lowering the temperature of ignition of the analysed mixture and decreasing the quantity of the released oxygen generated by decomposition of the oxidant, which did not react with the iron powder.
Źródło:
Central European Journal of Energetic Materials; 2008, 5, 3-4; 87-102
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of strain rate on microstructure and mechanical behavior of P/M feal
Wpływ prędkości odkształcenia na strukturę i charakter plastycznego płynięcia stopu FeAl otrzymanego metodą metalurgii proszków
Autorzy:
Śleboda, T.
Powiązania:
https://bibliotekanauki.pl/articles/950798.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
stopy Fe-Al
struktura
odkształcenie plastyczne
prędkość odkształcenia
metalurgia proszków
FeAl alloys
microstructural evolution
mechanical behavior
strain rate
powder metallurgy
Opis:
As part of a broader study of the thermomechanical processing of P/M FeAl alloys, this research is focused on the influence of processing strain rate on the microstructural evolution and mechanical behavior of the processed materials. For the purposes of this study, water atomized FeAl powder was consolidated by hot pressing resulting in fully dense products. The consolidated P/M samples were thermomechanically processed in compression at 800 and 900oC at strain rates of 0.1 s-1 and 10 s-1, to a true strain of 1. The influence of thermomechanical processing parameters on the material flow and microstructural development of investigated alloy was analyzed. Considerable strain rate sensitivity of investigated alloy was observed, specially with reference to microstructural development.
W niniejszej pracy przedstawiono wybrane wyniki badań wpływu prędkości odkształcenia na rozwój mikrostruktury oraz charakter odkształcenia plastycznego stopu z grupy FeAl. W badaniach zastosowano rozpylany wodą proszek stopu. W pełni zagęszczone poprzez prasowanie na gorąco próbki z proszków poddano próbie ściskania w temperaturach 800°C oraz 900°C przy prędkościach odkształcenia równych 0.1 s(-1) oraz 10 s(-1), do wartości odkształcenia rzeczywistego równej 1. W materiałach odkształconych w temperaturze 800°C rozdrobnienie mikrostruktury nastąpiło tylko przy większej prędkości odkształcenia (10 s(-1) ), natomiast w temperaturze 900°C materiał uległ rekrystalizacji niezależnie od prędkości odkształcenia. Badania wykazały stosunkowo dużą czułość stopu na prędkość odkształcenia, szczególnie w odniesieniu do zmian strukturalnych związanych z procesami rekrystalizacji.
Źródło:
Metallurgy and Foundry Engineering; 2008, 34, 2; 133-138
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iron-bearing phases affecting the colour of upper Neogene clayey sediments from Dymaczewo Stare, west-central Poland
Autorzy:
Klęsk, Jakub
Błachowski, Artur
Diduszko, Ryszard
Kruszewski, Łukasz
Widera, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2204349.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
mineral composition
powder X-ray diffraction
PXRD
iron minerals
57Fe Mössbauer spectroscopy
57Fe- MS
Poznań clays
Mio-Pliocene
skład mineralny
proszkowa dyfrakcja rentgenowska
minerały żelaza
spektroskopia Mössbauera
iły poznańskie
Opis:
The present paper investigates the colour dependence of mineral compositions in clay-rich sedimentary strata, mainly clayey silts, the emphasis being on iron-bearing minerals (rather than clay minerals) by using powder X-ray diffraction (PXRD) and 57Fe Mössbauer spectroscopy (57Fe-MS). The PXRD-based phase analysis has demonstrated the variable compositions of samples, consisting of, inter alia, quartz, calcite or gypsum, and admixtures of potassium feldspars and plagioclase. Hematite + goethite (sample D1, dark red), goethite (sample D2, pinkish brown), poorly crystalline goethite (sample D3, orange) and jarosite (sample D4, yellow) have been distinguished. A very low jarosite content was detected in sample D5 (light grey); this did not affect its colour. The potential yellow/brown shades in sample D6 (dark grey), coming from trace amounts of jarosite, are masked by macroscopically visible organic matter. In the case of the two last-named samples (D5 and D6), with trace amounts of Fe-bearing minerals, it is most likely that the organic matter was effective in influencing the light and dark grey colour of the sediment, respectively.
Źródło:
Geologos; 2022, 28, 2; 129--139
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Wear Resistant Iron-Base Matrix Materials For The Fabrication Of Sintered Diamond Tools
Nowe, odporne na zużycie ścierne materiały na bazie żelaza przeznaczone do produkcji spieków narzędziowych metaliczno-diamentowych
Autorzy:
Konstanty, J.
Romański, A.
Baczek, E.
Tyrala, D.
Powiązania:
https://bibliotekanauki.pl/articles/355118.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ball milling
sintered diamond tools
matrix powder
Fe-Ni-Cu-Sn-C
Fe-Mn-Cu-Sn-C
hot pressing
mielenie kulowe
spieki narzędziowe metaliczno-diamentowe
materiały spiekowe
prasowanie na gorąco
Opis:
The possibility of the use of inexpensive iron-base powders in the production of sintered diamond tools is again explored. Ball-milled Fe-Ni-Cu-Sn-C and Fe-Mn-Cu-Sn-C powders were consolidated to a virtually pore-free condition by hot pressing at 900°C. The resultant materials are characterised by a combination of high Knoop hardness, 260-440 and yield strength, 780-1350 MPa, and resistance to abrasion. These properties can be significantly modified by changing the milling time.
W artykule zamieszczono wyniki badań nad możliwością zastosowania tanich proszków na bazie żelaza do produkcji spiekanych narzędzi metaliczno-diamentowych. Mielone proszki Fe-Ni-Cu-Sn-C i Fe-Mn-Cu-Sn-C poddano prasowaniu na gorąco w temperaturze 900°C. Otrzymane spieki posiadają gęstość zbliżoną do teoretycznej, wysoką twardość (260-400 HK0.5), granicę plastyczności (780-1350 MPa) oraz dużą odporność na zużycie ścierne. Wymienione własności są w dużym stopniu uzależnione od czasu mielenia proszków wyjściowych.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 633-637
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect Of DyMn Alloy-Powder Addition On Microstructure And Magnetic Properties Of NdFeB Sintered Magnets
Wpływ dodatku proszku DyMn na mikrostrukturę i właściwości magnetyczne spiekanych magnesów NdFeB
Autorzy:
Lee, M.-W.
Dhakal, D. R.
Kim, T. H.
Lee, S. R.
Kim, H. J.
Jang, T. S.
Powiązania:
https://bibliotekanauki.pl/articles/357010.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Nd-Fe-B sintered magnets
DyMn-alloy powder
coercivity
low melting point element
magnesy spiekane
proszek DyMn
koercja
elementy o niskiej temperaturze topnienia
Opis:
Micostructural change and corresponding effect on coercivity of a NdFeB sintered magnet mixed with small amount of DyMn powder was investigated. In the sintered magnet mixed with the DyMn alloy-powder Dy-rich shell was formed at outer layer of the main grains, while Mn was mostly concentrated at Nd-rich triple junction phase (TJP), lowering melting temperature of the Nd-rich phase that eventually improved the microstructural characteristics of the gain boundary phase. The coercivity of a magnet increased more than 3.5 kOe by the mixing of the DyMn alloy-powder.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1407-1409
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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