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Tytuł:
Processing and Characterization of Fe-Cu-Ni Sinters Prepared by Ball Milling and Hot Pressing
Autorzy:
Borowiecka-Jamrozek, J.
Powiązania:
https://bibliotekanauki.pl/articles/354394.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
matrix
diamond
hot pressing
diamond tools
Opis:
The main objective of the present work was to determine the effect of powder composition on microstructure and properties of iron-base materials used as matrices in diamond impregnated tools. The Fe-Cu-Ni powders premixed and ball-milled for 30 hours, were used for the experiments. The influence of manufacturing process parameters on microstructure and mechanical properties of produced sinters was investigated. Sintering was done by hot-pressing technique in graphite mould. The powders were consolidated to a virtually pore-free condition during 3 minutes hold at 35 MPa and 900°C. Investigations of the sintered materials included: density, hardness, static tensile test and X-ray diffraction (XRD) analysis. Microstructural and fractographic observations were also made with a scanning electron microscope (SEM). The obtained results indicate that the sintered parts have a high density, close to the theoretical value, good plasticity, relatively high hardness and yield strength, and are characterized by a coarse-grained microstructure.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1157-1161
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LMO Ceramics Microstructure
Autorzy:
Bruś, B.
Zarycka, A.
Powiązania:
https://bibliotekanauki.pl/articles/350959.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LMO
microstructure
hot pressing
free sintering
Opis:
The aim of this work was to characterize the microstructure of LMO type ceramics. The ceramics obtained by the free sintering at two temperatures 1473 K and 1573 K and two sintering times 6 and 12 h was the test material. One series was also obtained by the hot pressing method for a comparison. In all the cases the material synthesis was conducted by the solid-state reaction method at 1173 for 24 h. Photographs of the specimen fractures were taken by a scanning electron microscope to characterize the microstructure of the ceramics obtained in a more detailed way. The VISILOG 4 system, enabling to calculate a lot of parameters characterizing the material microstructure, such as e.g.: a number of grains on the unit area, an average grain size, shape indexes of the grains in question, was used as well. It allows determining a grain size distribution, and a frequency of presence of grains with the specific shape index. By analyzing a set of the parameters obtained an influence of the technological conditions on the microstructure of the material in question, and on its properties and applicability at the same time can be determined.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 857-862
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sintered FeCuRe Alloys Produced from Commercially Available Powders
Autorzy:
Borowiecka-Jamrozek, J.
Powiązania:
https://bibliotekanauki.pl/articles/353762.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sintered alloy
matrix powder
hot pressing
diamond impregnated tools
Opis:
This paper discusses the mechanical properties of materials fabricated from commercially available powders designed for use as a metal matrix of diamond-impregnated composites. The powders with the catalogue numbers CSA and CSA800 produced in China were tested under laboratory conditions. The specimens were fabricated in a graphite mould using hot pressing. The materials were analysed for density, porosity, hardness and static tensile strength. A scanning electron microscope (SEM) was employed to observe the microstructure and fracture surfaces of the specimens. The experimental data was used to determine how the chemical composition of the powders and the process parameters affected the microstructure and properties of the materials. The properties of the sintered materials produced from the Chinese powders were compared with the properties reported for specimens fabricated from cobalt powder (Co SMS). Even though the hot pressed CSA and CSA800 powders had inferior mechanical properties to their cobalt analogue, they seem well-suited for general-purpose diamond-impregnated tools with less demanding applications.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1713-1720
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and thermal properties of tungsten carbide – graphite nanoparticles nanocomposites
Autorzy:
Kornaus, K.
Gubernat, A.
Zientara, D.
Rutkowski, P.
Stobierski, L.
Powiązania:
https://bibliotekanauki.pl/articles/779930.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
graphene
composites
thermal and mechanical properties
tungsten carbide
hot pressing
Opis:
Previous studies concerning pure tungsten carbide polycrystalline materials revealed that nanolayers of graphite located between WC grains improve its thermal properties. What is more, pressure-induced orientation of graphene nano platelets (GNP) in hot pressed silicon nitride-graphene composites results in anisotropy of thermal conductivity. Aim of this study was to investigate if addition of GNP to WC will improve its thermal properties. For this purpose, tungsten carbide with 0.5–6 wt.% of GNP(12)-additive underwent hot pressing. The microstructure observations performed by SEM microscopy. The anisotropy was determined via ultrasonic measurements. The following mechanical properties were evaluated: Vickers hardness, bending strength, fracture toughness KIc. The influence of GNP(12) addition on oxidation resistance and thermal conductivity was examined. It was possible to manufacture hot-pressed WC-graphene composites with oriented GNP(12) particles, however, the addition of graphene decreased both thermal and mechanical properties of the material.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 2; 84-88
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An influence of mechanical mixing and hot-pressing on properties of NiAl/Al2O3 composite
Wpływ mechanicznego mieszania oraz parametrów spiekania pod ciśnieniem na właściwości kompozytu NiAl/ Al2O3
Autorzy:
Kaliński, D.
Chmielewski, M.
Pietrzak, K.
Choręgiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/354230.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
materiały konstrukcyjne
mieszanie
kompozyty
intermetallics
composite materials
mechanical mixing
hot pressing
mechanical properties
Opis:
Intermetallic phases of the Ni-Al type belong to the group of modern constructional materials which have numerous advantageous properties such as high melting temperature, low density, high resistance to high-temperature oxidation (to about 1200 degree Celsjus), high mechanical strength, high fatigue strength, and high tensile and compressive strength (also at elevated temperatures). Intermetallic compounds have however also drawbacks in that they are quite brittle at room temperature which makes their mechanical processing very difficult and restricts their application range. These drawbacks can be obviated by modifying their chemical composition. Improving the properties of NiAl-based materials can be achieved by creating the composite with the matrix made of an intermetallic phase NiAl reinforced with ceramic (Al2O3) particles. This paper is concerned with the mechanical and physical properties (bending strength, fracture toughness, hardness, and Young modulus) and also the microstructure of NiAl/Al2O3 composite. The composite materials were produced by the hot-pressed method using the NiAl/20%Al2O3 (vol.%) powder mixtures. The composite thus produced had a high density of about 99% of the theoretical value and a high bending strength. The bending strength of the NiAl/20vol.%Al2O3 composite was higher by about 80% (635 MPa) than that of the pure NiAl phase (345 MPa). The experiments included also the examination of the effect of the rotational speed of the mill and the duration of the mixing process upon the size and distribution of grains, the microstructure, and phase composition of the composite powder mixtures obtained.
Fazy międzymetaliczne typu Ni-Al należą do grupy nowoczesnych materiałów konstrukcyjnych, charakteryzujących się m.in: wysoką temperaturą topnienia, niską gęstością, wysoką odpornością na utlenianie w wysokich temperaturach (do około 1200 stopni Celsjusza), wysokim modułem sprężystości- stabilnym ze wzrostem temperatury, wysoka wytrzymałością, wysoką odpornością na ścieranie, wysoką wytrzymałością zmęczeniową, wysoką wytrzymałością na rozciąganie i ściskanie (również w wysokich temperaturach). Związki międzymetaliczne mają jednak wady, są dość kruche w temperaturze pokojowej - co znacznie utrudnia m.in. ich obróbkę mechaniczną i zawęża zakres zastosowań. Jednym ze sposobów wyeliminowania tych wad jest modyfikacja ich składu chemicznego. Poprawę właściwości materiałów na bazie NiAl można osiągnąć m.in. poprzez wytworzenie kompozytu na osnowie NiAl umocnionego cząsteczkami Al2O3. W artykule zaprezentowano wyniki prac dotyczących opracowania warunków procesu mechanicznego mieszania mieszanin proszków związek międzymetaliczny (NiAl) - ceramika (Al2O3), a następnie ich spiekania. Przyjęte parametry mieszania i spiekania pozwoliły otrzymać kompozyt charakteryzujący sie odpowiednia gęstością, bliską teoretycznej (99.9%) oraz wysoką wytrzymałością. Wytrzymałość na zginanie kompozytu NiAl/20%obj.Al2O3 była o 80% (635 MPa) wyższą od wytrzymałości czystej fazy NiAl (345 MPa).
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 3; 696-702
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:
Effect Of Hot Pressing On The Electrochemical Properties Of Ti-Ni Alloy
Wpływ prasowania na gorąco na właściwości elektrochemiczne stopu Ti-Ni
Autorzy:
Balcerzak, M.
Jurczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/353286.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical alloying
hot pressing
SEM
XRD
electrochemical measurements
stopowanie mechaniczne
prasowanie na gorąco
pomiary elektrochemiczne
Opis:
Ti2Ni alloy pellets were produced by mechanical alloying and hot pressing at 750°C for 0.5 h in vacuum. X-ray diffraction analysis showed that, after 8 h of milling, a starting mixture of elements mostly decomposed into an amorphous phase. Obtained powders and flakes have cleavage fracture morphology with huge number of dimples with different sizes. Hot pressing of materials caused formation of Ti2Ni main phase. Porosity of pellets strongly depended on size of agglomerates and pressure of pressing. Ti2Ni pellets were used as negative electrodes for Ni-MHx batteries. Maximum measured discharge capacity of studied materials was 220 mAh/g. Electrochemical properties resulted from size of agglomerates, degree of oxidation and pressure of pressing.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1335-1340
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Sinters Produced from Commercially Available Powder Mixtures
Autorzy:
Borowiecka-Jamrozek, J.
Lachowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/382036.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite
diamond
metal matrix
sinter
hot pressing
kompozyt
diament
osnowa metalowa
spiek
prasowanie na gorąco
Opis:
This paper discusses the mechanical properties of a material fabricated from commercially available metal powder mixtures designed for use as a metal matrix of diamond impregnated composites. The mixtures with the catalogue numbers CSA and CSA800 provided by a Chinese producer are suitable for experimental laboratory testing. The specimens were fabricated in a graphite mould using hot pressing. The material was tested for density, porosity, hardness, and tensile strength under static loading. A scanning electron microscope (SEM) was used to analyze the microstructure and cleavage fracture of broken specimens. It was essential to determine how the chemical composition and the fabrication process affected the microstructure and properties of the material. The properties of the sinters were compared with those of hot pressed specimens fabricated from sub-micron size cobalt powder (Cobalt SMS). Although the as-consolidated material is inferior to cobalt, it displays a favourable combination of hardness, yield strength and ductility, and seems to have a great potential for moderate and general purpose applications.
Źródło:
Archives of Foundry Engineering; 2016, 16, 4; 37-40
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detonation-Sprayed WC-12%Co and WC-17%Co Diamond-Impregnated Segments
Natryskiwanie detonacyjne powłok WC-12%Co i WC-17%Co na spieki metaliczno-diamentowe
Autorzy:
Borowiecka-Jamrozek, J.
Powiązania:
https://bibliotekanauki.pl/articles/356612.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cobalt
sinter
hot pressing
diamond impregnated tools
kobalt
spiek
prasowanie na gorąco
narzędzia diamentowe impregnowane
Opis:
This paper presents results of investigations of WC-12%Co and WC-17%Co coatings detonation sprayed on a sintered cobalt substrate. The main objective of the present work was to establish a new production route of sandwich type diamond-impregnated segments for circular sawing of stone and other construction materials. Unalloyed cobalt was chosen as the substrate material. Prior to coating the specimens were made by means of hot pressing of Extrafine cobalt powder in a graphite mould. The segments were then coated with WC-Co. The effects of the coating process on the thickness, microhardness, microstructure and wear resistance of the deposits were investigated. The properties of the coatings were established by performing the following tests: a microstructure analysis, a point analysis of chemical composition and a linear analysis, a phase composition, a microhardness tests and abrasion resistance.
W pracy przedstawiono wyniki badań detonacyjnego nanoszenia powłok WC-12%Co WC-17%Co na spieki kobaltu. Badania prowadzono w celu opracowania nowej technologii wytwarzania trójwarstwowych segmentów metaliczno-diamentowych typu sandwich przeznaczonych do produkcji tarczowych pił diamentowych i innych materiałów budowlanych. Próbki do badań otrzymano z proszków kobaltu gatunku Extrafine technika prasowania na gorąco w grafitowej matrycy, a następnie na ich powierzchnie natryskano powłoki WC-Co. Badano wpływ parametrów procesu natryskiwania na grubość, mikrotwardość, mikrostrukturę i odporność na zużycie ścierne uzyskanych powłok. Przeprowadzono następujące badania uzyskanych powłok: obserwacje mikrostruktury, analizę punktową i liniową składu chemicznego; analizę składu fazowego, pomiar mikrotwardości oraz badanie odporności powłok na zużycie ścierne.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1327-1330
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Microstructure, Electrical and Mechanical Properties of Hot Pressing Cr-50 Mass% Ni Alloys Fabricated by Addition of Various Ratios of Nanosized Ni Powders
Autorzy:
Huang, Jhong-Ren
Chang, Shih-Hsien
Liao, Cheng-Liang
Powiązania:
https://bibliotekanauki.pl/articles/2125538.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical conductivity
hot pressing
transverse rupture strength
nanosized nickel powders
Cr-50 mass% Ni alloy
Opis:
In this work, nanosized Ni (nNi) powders of 50 nm are mixed with Cr and Ni submicron-powders (600 nm) to fabricate Cr-50 mass% Ni alloys by vacuum hot pressing. In order to evaluate the influence of the nanosized Ni powders, different amounts of nanosized Ni powders are added to produce the Cr-(50-x) mass% Ni-x mass% nNi alloys (x = 0, 10, 20, and 30). The hot pressing was maintained at 1275°C, 48 MPa for 1 h. The microstructure evaluation, mechanical, and electrical properties were performed. The results reveal that mechanical and electrical properties are enhanced when increasing the nNi addition. The Cr-20 mass% Ni-30 mass% nNi presents the highest relative density of 96.53% and the electrical conductivity of 2.18×104 Scm-1, moreover, the hardness and transverse rupture strength values increase to 76.1 HRA and 1217 MPa, respectively. Moreover, a more homogeneous microstructure and a decrease in the mean grain size to 3.15 μm are acquired. Significantly, this fabrication procedure (adding 30 mass% nanosized nickel powders) results in the optimal microstructure, electrical and mechanical properties of submicron-structured Cr-(50-x) mass% Ni-x mass% nNi alloys.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 955--961
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Presence of Oxygen in Ti-Al-C MAX Phases-Based Materials and their Stability in Oxidizing Environment at Elevated Temperatures
Autorzy:
Prikhna, T.
Ostash, O.
Sverdun, V.
Karpets, M.
Zimych, T.
Ivasyshin, A.
Cabioc'h, T.
Chartier, P.
Dub, S.
Javorska, L.
Podgurska, V.
Figel, P.
Cyboroń, J.
Moshchil, V.
Kovylaev, V.
Ponomaryov, S.
Romaka, V.
Serbenyuk, T.
Starostina, A.
Powiązania:
https://bibliotekanauki.pl/articles/1029693.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Ti-Al-C MAX phases
high- temperature resistance in air and hydrogen
hot pressing
bending strength
Opis:
The Ti₃AlC₂-, (Ti,Nb)₃AlC₂- and Ti₂AlC-based materials turned out to be more resistant than Crofer JDA steel in oxidizing atmosphere as 1000 h long tests at 600°C have shown. But the amounts of oxygen absorbed by the materials during testing were different. The Ti₂AlC-based material demonstrated the lowest oxygen uptake, (Ti,Nb)₃AlC₂-based absorbed a somewhat higher amount and the highest amount was absorbed by Ti₃AlC₂-based material. Scanning electron microscopy and the Auger study witnessed that amounts of oxygen in the MAX phases before the exposure in air were as well different: the approximate stoichiometries of the matrix phases of materials were Ti_{3.1-3.2}AlC_{2-2.2}, Ti_{1.9-4}Nb_{0.06-0.1}AlC_{1.6-2.2}O_{0.1-1.2} and Ti_{2.3-3.6}AlC_{1-1.9}O_{0.2-0.6}, respectively. The higher amount of oxygen present in the MAX phase structures may be the reason for higher resistance to oxidation during long-term heating in air at elevated temperature. The studied materials demonstrated high stabilities in hydrogen atmosphere as well. The bending strength of the Ti₃AlC₂- and (Ti,Nb)₃AlC₂-based materials after keeping at 600°C in air and hydrogen increased by 10-15%, but the highest absolute value of bending strength before and after being kept in air and hydrogen demonstrated the Ti₂AlC-based material (about 590 MPa).
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 789-793
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and properties of hot-pressed molybdenum-alumina composites
Spiekane kompozyty molibden-Al2O3 - struktura i właściwości
Autorzy:
Chmielewski, M.
Dutkiewicz, J.
Kaliński, D.
Lityńska-Dobrzyńska, L.
Pietrzak, K.
Strojny-Nędza, A.
Powiązania:
https://bibliotekanauki.pl/articles/354228.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
materiały ceramiczne
kompozyty ceramiczno-metalowe
technika spiekania
ceramic-metal composites
hot pressing
microstructure
interface
mechanical properties
Opis:
Brittleness is the main technical limitation on a wide use of advanced ceramic materials. To overcome this problem, ceramic-metal composites are commonly applied. A principal advantage of ceramic-metal composite materials is their higher resistance to brittle fracture. An increase of fracture toughness depends on the type, amount, size and shape of a metallic component. The metallic phase can additionally modify physical, mechanical and thermal properties of materials. The results of experiments concerning a manufacturing process of Mo-Al2O3 composite materials obtained by the hot pressing method were presented. Two powder mixtures with different volume fraction of aluminium oxide were prepared in a planetary ball mill. The hot pressing process allowed to obtain well-densified metal matrix composites (˜99% of a theoretical density). Microstructural observations of sinters were conducted using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. Very stable bonding between metal and ceramic grains was observed. Complex investigations of the physical and mechanical properties of obtained molybdenum-alumina composite materials seem to be very promising from an application point of view.
Główna przyczyną ograniczenia stosowalności zaawansowanych materiałów ceramicznych jest ich kruchość. W celu pokonania tego problemu powszechnie stosuje sie kompozyty ceramiczno-metalowe, których zaletą jest wyższa odporność na kruche pękanie w porównaniu z materiałami ceramicznymi. Zależy ona od wielu czynników m.in. rodzaju, ilości, wielkości oraz kształtu zastosowanego metalu. Ostatecznym zmianom ulegają równiez inne właściwości tj. fizyczne, mechaniczne, termiczne. W pracy przedstawiono wyniki technologicznych prób otrzymywania materiałów kompozytowych Mo-Al2O3 przy wykorzystaniu techniki spiekania pod ciśnieniem. Mieszaniny proszków o różnych udziałach objętosciowych fazy ceramicznej przygotowano w planetarnym młynku kulowym. Ostateczny proces zageszczania pozwolił uzyskac materiały o wysokiej gestości względnej (powyżej 99% gęstości teoretycznej). Analizowano mikrostrukturę spieków z wykorzystaniem skaningowej i transmisyjnej mikroskopii elektronowej. Stwierdzono występowanie bardzo dobrego połączenia fazy ceramicznej z osnową metalową. Przeprowadzono szeroką analizą właściwosci fizycznych i mechanicznych uzyskanych kompozytów, co powinno pozwolić na rozszerzenie możliwości aplikacyjnych opracowanych tworzyw.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 3; 686-693
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Thermomechanical Model of an Elastic Particle in a Metallic Matrix
Autorzy:
Lachowski, J.
Borowiecka-Jamrozek, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/381688.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical properties
synthetic diamond
hot pressing
silicon precipitate
właściwości mechaniczne
diament syntetyczny
prasowanie na gorąco
osad krzemowy
Opis:
This paper deals with numerical and analytical modelling of a diamond or silicon particle embedded in a metallic matrix. The numerical model of an elastic particle in a metallic matrix was created using the Abaqus software. Truncated octahedron-shaped and spherical-shaped diamond particles were considered. The numerical analysis involved determining the effect of temperature on the elastic and plastic parameters of the matrix material. The analytical model was developed for a spherical particle in a metallic matrix. The comparison of the numerical results with the analytical data indicates that the mechanical parameters responsible for the retention of diamond particles in a metal matrix are: the elastic energy of the particle, the elastic energy of the matrix and the radius of the plastic zone around the particle. An Al-based alloy containing 5% of Si and 2% of Cu was selected to study the mechanical behaviour of silicon precipitates embedded in the aluminium matrix. The model proposed to describe an elastic particle in a metallic matrix can be used to analyze other materials with inclusions or precipitates.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 79-83
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Engineering structure and properties of materials used as a matrix in diamond impregnated tools
Kształtowanie struktury i własności materiałów stosowanych jako osnowa w narzędziach metaliczno-diamentowych
Autorzy:
Borowiecka-Jamrozek, J.
Powiązania:
https://bibliotekanauki.pl/articles/350930.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
narzędzia metaliczno-diamentowe
kobalt
prasowanie na gorąco
własności mechaniczne
PM diamond tools
cobalt
hot pressing
mechanical properties
Opis:
The paper presents mechanical properties of materials used as matrices in diamond impregnated tools. Several powder metallurgy materials were manufactured by the hot press process from various combinations of cobalt (Co SMS, Co Extrafine, Co 400mesh), carbonyl iron (Fe CN) and tungsten (WP30) powders. After consolidation the specimens were tested for density, hardness and tensile properties. The fracture surfaces and materials' microstructure were observed using the Jeol JSM- 5400 scanning electron microscope and the Leica DM4000 light microscope. The main objective of the work was to determine the effects of the mean particle size of cobalt as well as additions of iron and tungsten on properties of the as-consolidated material.
W pracy przedstawiono wyniki badań własności mechanicznych materiałów stosowanych na osnowy narzędzi metaliczno-diamentowych. Badano spieki wykonane metodą prasowania na gorąco z proszków: kobaltu (Co SMS, Co Extrafine, Co 400mesh), zelaza karbonylkowego (Fe CN) i wolframu (WP30). Badania obejmowały: pomiar gęstości, twardości i statyczną próbę rozciągania. Dokonano również obserwacji mikrostruktury przy użyciu świetlnego mikroskopu Leica DM4000 i przełomów przy zastosowaniu elektronowego mikroskopu skanningowego Jeol JSM-5400. Badania prowadzono w celu okreslenia wpływu wielkości cząstek proszku kobaltu oraz dodatku wolframu i żelazana własności otrzymanych spieków.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 1; 5-8
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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

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