Production of cast materials based on Cr2AlC MAX phase by SHS metallurgy using coupled chemical reaction
https://doi.org/10.17073/1997-308X-2019-4-14-20
Abstract
It is known that materials based on MAX phases have great potential for aerospace, automotive and industrial applications due to a unique combination of features offered by both metals and ceramics with high mechanical, chemical, thermal and electrical properties. This paper provides the results obtained by the SHS metallurgy of Cr–Al–C materials with different ratios between the MAX-Cr2AlC phase, carbides and chromium aluminides. Experiments were carried out in a 3-liter SHS reactor at an initial pressure of inert gas (Ar) of 5 MPa. The synthesis process was carried out based on coupled chemical reactions: weakly exothermic (heat acceptor) – Cr2O3/3Al/C and strongly exothermic (heat donor) – 3CaO2/2Al. The obtained experimental results have a good correlation with previously performed thermodynamic calculations. It is shown that varying the composition of the initial mixtures can significantly influence the calculated and experimental synthesis parameters as well as the phase composition and microstructure of final products. The paper establishes optimal conditions for material synthesis providing a maximum output of the Cr2AlC MAX phase in the ingot composition. A determining factor influencing the Cr2AlC content in the final product is the time of liquid phase presence under synthesis conditions. It is shown that the maximum content of the Cr2AlC MAX phase and the target product yield is achieved at the highly exothermic additive (3CaO2/2Al) content of 30 % in the initial mixture.
About the Authors
V. A. Gorshkov
Merzhanov Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences (ISMAN)
Russian Federation
Russian Federation
Dr. Sci. (Tech.), leading researcher of Laboratory «SHS melts and cast materials», Merzhanov Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences (ISMAN).
142432, Moscow region, Chernogolovka, Acad. Osip’yan str., 8.
P. A. Miloserdov
Merzhanov Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences (ISMAN)
Russian Federation
Russian Federation
Cand. Sci. (Tech.), senior researcher of Laboratory «SHS melts and cast materials», ISMAN.
142432, Moscow region, Chernogolovka, Acad. Osip’yan str., 8.
N. Yu. Khomenko
Merzhanov Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences (ISMAN)
Russian Federation
Russian Federation
Junior researcher of Laboratory of X-ray investigation, ISMAN.
142432, Moscow region, Chernogolovka, Acad. Osip’yan str., 8.
N. V. Sachkova
Merzhanov Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences (ISMAN)
Russian Federation
Russian Federation
Researcher of Laboratory of materials science, ISMAN.
142432, Moscow region, Chernogolovka, Acad. Osip’yan str., 8.
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Review
For citations:
Gorshkov V.A., Miloserdov P.A., Khomenko N.Yu., Sachkova N.V. Production of cast materials based on Cr2AlC MAX phase by SHS metallurgy using coupled chemical reaction. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2019;(4):14-20. (In Russ.) https://doi.org/10.17073/1997-308X-2019-4-14-20
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