Boride-silicon carbide-boron carbide ternary ceramic-base composite material and preparation method thereof

Abstract

The invention relates to a boride-silicon carbide-boron carbide ternary ceramic matrix composite material and a production method thereof. The invention relates to a ternary ceramic matrix composite material and a production method thereof, and solves the problem of poor toughness of the existing ultrahigh temperature ceramic materials. The inventive boride-silicon carbide-boron carbide ternary ceramic matrix composite material is made from, by volume percentages, 50%-80% of borides, 10%-30% of silicon carbide and 5%-30% of boron carbide. The production method comprises the following steps: (1) wet mixing and sieving; and (2) hot-press sintering. The maximal bending strength of the boride-silicon carbide-boron carbide ternary ceramic matrix composite material reaches 890 MPa, and the maximal fracture toughness thereof reaches 7.1 MPa/m<2>.

Description

technical field [0001] The invention relates to a ternary ceramic matrix composite material and a preparation method thereof. Background technique [0002] Boride ceramic materials can maintain good physical and chemical stability in high-temperature environments and reaction atmospheres, and their melting points exceed 3000 °C. Due to their excellent physical properties (high melting point, thermal conductivity, elastic modulus, and excellent chemical stability), boride ceramic materials have become the most promising candidate materials for key parts of modern aircraft, and have a wide range of applications in the aerospace field. Application prospect. [0003] Although boride ceramic materials have many advantages, their low strength and fracture toughness have not been well resolved, which is one of the key factors limiting their excellent performance. The conventional method is to add a second phase component to the boride matrix to achieve the effect of toughening an...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the defect of low toughness existing in the existing ultra-high temperature ceramic materials, and provides a boride-silicon carbide-boron carbide ternary ceramic matrix composite material and its preparation method