Temat: MAX phases - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A Comparative Study of the Feasibility of Cellular MAX Phase Preforms Formation by Microwave-Assisted SHS and SPS Techniques
Autorzy:: Dmitruk, A.
Lagos, M.
Naplocha, K.
Egizabal, P.
Powiązania:: https://bibliotekanauki.pl/articles/352206.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: MAX phases
SHS synthesis
microwave
SPS
porous preform
Opis:: Two methods were evaluated in terms of manufacturing of MAX phase preforms characterized with open porosity: microwave-assisted self-propagating high-temperature synthesis (SHS) and spark plasma sintering (SPS). The main purpose of fabrication of such open-porous preforms is that they can be successfully applied as a reinforcement in metal matrix composite (MMC) materials. In order to simulate the most similar conditions to microwave-assisted SHS, the sintering time of SPS was significantly reduced and the pressure was maintained at a minimum value. The chosen approach allows these two methods to be compared in terms of structure homogeneity, complete reactive charge conversion and energy effectivity. Study was performed in Ti-Al-C system, in which the samples were compacted from elemental powders of Ti, Al, C in molar ratio of 2:1:1. Manufactured materials after syntheses were subjected to SEM, XRD and STEM analyses in order to investigate their microstructures and chemical compositions. As was concluded, only microwave-assisted SHS synthesis allows the creation of MAX phases in the studied system. SPS technique led only to the formation of intermetallic secondary phases. The fabrication of MAX phases’ foams by microwave-assisted SHS presents some interesting advantages compared to conventional manufacturing methods. This work presents the characterization of foams obtained by microwave-assisted SHS comparing the results with materials produced by SPS. The analysis of SPS products for different sintering temperatures provided the better insight into the synthesis of MAX phases, supporting the established mechanism. Dissimilarities in the heating mechanisms that lead to the differing synthesis products were also discussed.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 2; 575-582
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A Novel Theoretical Study of Elastic and Electronic Properties of M₂CdC (M = Zr, Hf, and Ta) MAX Phases
Autorzy:: Mebrek, M.
Mokaddem, A.
Doumi, B.
Yakoubi, A.
Mir, A.
Powiązania:: https://bibliotekanauki.pl/articles/1030613.pdf
Data publikacji:: 2018-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: MAX phases
ab initio
structural properties
electronic properties
elastic properties
crystal structure
Opis:: In this study, we have investigated the structural, electronic, and elastic properties of the M₂CdC (M = Ta, Zr, and Hf) MAX phases, using the first-principle methods based on the density functional theory. The calculated formation energies revealed that these compounds are thermodynamically stable in the hexagonal MAX phase. The stability is confirmed by the elastic constants and the conditions of mechanical stability criterion. Also, we have determined the bulk and shear modules of the Young modulus and the Poisson coefficient. The band structures indicate that the three materials are electrically conductive. The chemical bond in M₂CdC is covalent-ionic in nature with the presence of metallic character. For the density of states the hybridization peak between M d and C p occurs in the lower energy range. We have found that there is no gap for these materials due to the existence of a maximum peak of DOS around Fermi level.
Źródło:: Acta Physica Polonica A; 2018, 133, 1; 76-81
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Processing And Properties Of MAX Phases – Based Materials Using SHS Technique
Wytwarzanie oraz właściwości tworzyw typu MAX otrzymywanych za pomocą techniki SHS
Autorzy:: Chlubny, L.
Lis, J.
Chabior, K.
Chachlowska, P.
Kapusta, C.
Powiązania:: https://bibliotekanauki.pl/articles/353375.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: MAX phases
SHS
hot-pressing
Ti2AlC
Ti3AlC2
fazy MAX
prasowanie na gorąco
Opis:: Authors present results of works on the interesting new group of advanced ceramics called MAX phases – Ti-based ternary carbides and nitrides. They have an original layered structure involved highly anisotropic properties laying between ceramics and metals, with high elastic modulus, low hardness, very high fracture toughness and high electrical and heat conductivity. Using Self-Propagating High-Temperature Synthesis (SHS) in the combustion regime it is possible to prepare MAX phases-rich powders that can be used as the precursors for preparation of dense MAX polycrystals by presureless sintering or hot-pressing. Different novel Ti-based phases with layered structures, namely: Ti₃AlC₂ and Ti₂AlC have been synthesized in a combustion regime. The possibility of controlling of combustion phenomena for obtaining near single-phase products is discussed in details as well as some of properties of the materials tested as structure and functional ceramics.
Autorzy przedstawiają wyniki badań nad nową interesującą grupą zaawansowanych materiałów ceramicznych nazywanych fazami MAX – potrójnymi węglikami i azotkami tytanowymi. Posiadają one oryginalną strukturę warstwową, z której wynikają silnie anizotropowe właściwości (wysokie moduły sprężystości, niska twardość, bardzo wysoka odporność na kruche pękanie, dobre właściwości elektryczne i cieplne) umiejscawiające je pomiędzy ceramiką a metalami. Dzięki zastosowaniu Samorozwijającej się Syntezy Wysokotemperaturowej SHS możliwe było otrzymywanie bogatych w fazy MAX proszków, mogących służyć jako prekursory w preparatyce gęstych polikryształów za pomocą spiekania pod ciśnieniem lub swobodnego. Przeprowadzone zostały syntezy dwóch materiałów warstwowych: Ti₃AlC₂ i Ti₂AlC. W artykule przedstawiono możliwości kontrolowania procesu spalania w celu uzyskania niemal jednofazowych produktów a także przedstawiono niektóre właściwości badanych materiałów pod kątem zastosowania jako materiały funkcjonalne i strukturalne.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 2A; 859-863
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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