Mechanical properties and plasma erosion resistance of BN_p/Al₂O₃-SiO₂ composite ceramics

Abstract

Al₂O₃-SiO₂ system ceramic matrix composites with different volume fractions (10%–60%) of hexagonal BN particulates (BN_p) were prepared by hot-press sintering technique. Phase components, microstructure, mechanical properties and plasma erosion resistance were also investigated. With the increase of h-BN_p content, relative density and Vickers’ hardness of the composite ceramics decrease, while the flexural strength, elastic modulus and fracture toughness increase and then decrease. The plasma erosion resistance linearly deteriorated with the increase of BN_p content which is mainly determined by the density, crystal structure and atomic number of the elements.

Keywords

BN-Al₂O₃-SiO₂ composite ceramics / microstructures / mechanical properties / plasma erosion resistance

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