| abstract |
The invention provides a silicon carbide composite ceramic material and a preparation method and application thereof, belonging to the technical field of ceramic materials, comprising the following steps: (1) ball milling and mixing silicon carbide particles, silicon carbide whiskers and rare earth oxides to obtain a mixture (2) The mixture obtained in the step (1) is mixed with an acid solution and then subjected to pressure sintering to obtain a silicon carbide composite ceramic material; the pressure sintering includes low temperature pressure sintering and high temperature pressure sintering in sequence. In the present invention, silicon carbide whiskers and rare earth oxides are added to the silicon carbide particles, wherein the silicon carbide whiskers can improve the toughness of the composite material, the rare earth oxide can improve the sintering activity, reduce the sintering temperature, and at the same time improve the compactness and hardness of the composite material . The results of the examples show that the relative density of the composite material prepared by the present invention is 98.9%, the hardness is 1750HV10, and the fracture toughness is 7.52MPa·m 1/2 . |