Gradient and non-gradient SiCw toughened boride based composite ceramic material and preparation method thereof

The invention relates to a gradient and non-gradient SiCw toughened boride based composite ceramic material and a preparation method thereof. The composite ceramic material is prepared from boride MB2serving as a matrix as well as 10%-30% silicon carbide particles SiCp in volume fraction and 10%-20% of silicon carbide whiskers SiCw in volume fraction serving as toughening phases. The composite ceramic material is prepared through steps as follows: the raw materials are subjected to reaction and hot pressing sintering, a boride matrix phase is synthesized in situ at 900-1200 DEG C, SiCp and SiCw toughening phases are generated in situ at 1400-1600 DEG C, and the dense boride based composite ceramic material is prepared through pressure sintering at 1800-2000 DEG C. With the adoption of thepreparation method, the toughening phases in the matrix are distributed uniformly, chemical compatibility of the matrix and the toughening phases is good, binding force is strong, so that the material has excellent comprehens