Nb2AlC MAX phase synthesis by SHS metallurgy
https://doi.org/10.17073/1997-308X-2019-2-42-48
Abstract
A cast material based on the Nb2AlC MAX phase was obtained by SHS metallurgy. Synthesis was carried out from the Nb2O5– Al–C mixture with a high-energy CaO2–Al additive. Thermodynamic calculation results correlate well with experimental data. It was found that the CaO2–Al additive content has a substantial effect on the thermodynamic parameters and phase composition of the final product. It was shown that synthesis from the specified mixtures passed in a stationary mode with steady combustion wave. Increasing the additive content leads to increasing combustion rate (from 6 to 12 mm/s), and product yield to ingot increases (from 30 to 47 %) up to 15 wt.% of the additive and then decreases. Variation in the composition of initial mixtures can provide a significant impact on both synthesis parameters and final product phase composition. Optimal conditions of material synthesis to ensure maximum yield of the Nb2AlC MAX phase in the ingot composition were determined. The liquid phase lifetime during synthesis is a determining factor influencing the Nb2AlC content in the final product. It is shown that the maximum Nb2AlC phase amount (67 wt.%) is reached with 15 wt.% of the high-energy additive in the initial charge.
About the Authors
I. D. Kovalev
Institute of Structural Macrokinetics and Materials, Russian Academy of Sciences (ISMAN)
Russian Federation
Russian Federation
Cand. Sci. (Phys.-Math.), Researcher, Laboratory of X-Ray diffraction studies
142432, Moscow reg., Chernogolovka, Acad. Osipyan str., 8
P. A. Miloserdov
Institute of Structural Macrokinetics and Materials, Russian Academy of Sciences (ISMAN)
Russian Federation
Russian Federation
Cand. Sci. (Tech.), Researcher, Laboratory of SHS melts and cast materials
142432, Moscow reg., Chernogolovka, Acad. Osipyan str., 8
V. A. Gorshkov
Institute of Structural Macrokinetics and Materials, Russian Academy of Sciences (ISMAN)
Russian Federation
Russian Federation
Dr. Sci. (Phys.-Math.), Leading researcher, Laboratory of SHS melts and cast materials
142432, Moscow reg., Chernogolovka, Acad. Osipyan str., 8
D. Yu. Kovalev
Institute of Structural Macrokinetics and Materials, Russian Academy of Sciences (ISMAN)
Russian Federation
Russian Federation
Cand. Sci. (Tech.), Head of Laboratory of X-Ray diffraction studies
142432, Moscow reg., Chernogolovka, Acad. Osipyan str., 8
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Review
For citations:
Kovalev I.D., Miloserdov P.A., Gorshkov V.A., Kovalev D.Yu. Nb2AlC MAX phase synthesis by SHS metallurgy. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2019;(2):42-48. (In Russ.) https://doi.org/10.17073/1997-308X-2019-2-42-48
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