▎ 摘　　要

Graphene oxide coated silicon nitride coated powder was prepared by electrostatic self-assembly technique. Microstructure analysis shows that GO is uniformly coated on the surface of silicon nitride and evenly dispersed in the matrix material. The microstructure analysis and performance tests were carried out on ceramic tools with different volume contents of Si3N4@GO coated powder. The results show that when the content of Si3N4@GO is 7. 94 vol%, the comprehensive mechanical properties of Al2O3/WB2/(Si3N4@GO) ceramic tool materials are the best, with the Vickers hardness, flexural strength and fracture toughness 18.7GPa, 740 MPa and 8.2MPa.m(1/2), respectively. Compared with the Al2O3/WB2 ceramic tool material, the ceramic tool with Si3N4@GO coated powder increased the flexural strength and fracture toughness by 30.3% and 36.7%.