Influence of microstructure gradient on the elastic modulus and hardness of B4C-CrB2 ceramics produced by reactive hot pressing
D.V. Dik, A.A. Filippov, N.Yu. Burkhinova
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: boron carbide, chromium diboride, nanofiber carbon, hot pressing, microhardness, elastic modulus}
Abstract
Functionally graded B4C-CrB2 material with a CrB2 concentration gradient along the thickness equal to 5, 15, and 25 % was produced by reactive hot pressing of a mixture of boron carbide, chromium oxide, and a carbon material with high specific surface area. A general view of the microstructure and the size distribution of chromium diboride particles in each layer are presented. The change in mechanical properties with an increase in the CrB2 concentration is shown to be non-monotonic due to the features of boron carbide reduction.
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