Synthesis and study of dense materials in the Zr–Al–C system

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Abstract

The initial powders Zr, Al, C and Zr, Al, Sc were used for the synthesis of MAX phases of the composition Zr2AlC and Zr3AlC2. The highest content (50.4 vol%) of the MAX phase Zr3AlC2 was obtained using the initial powders Zr/Al/Zr in the ratio of components 1:1.5:2 with the addition of 5 vol% Al. The optimal temperature for the synthesis of a material based on the MAX phase Zr2AlC is 1525° C, a material based on Zr3AlC2 is 1575°C. The structure of the synthesized MAX materials obtained includes elongated grains of the composition Zr2AlC and Zr3AlC2, which determines their high strength. Zirconium carbide, as an intermediate phase, is always present in the final products. Due to the large evaporation of aluminum, the ZrO2 phase is also present in the synthesis products. Excess aluminum contributes to the greatest formation of Zr2AlC and Zr3AlC2 phases during synthesis.

About the authors

I. E Arlashkin

St. Petersburg State Institute of Technology (Technical University);I.V. Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Sciences

Email: iarlashkin@mail.ru

S. N Perevislov

I.V. Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Sciences

V. L Stolyarova

I.V. Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Sciences;St. Petersburg State University

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