Abstract: TiB2/TiCN composite ceramic tool material toughened by fiber was prepared by vacuum hot pressing sintering, and the Al2O3 fiber content and layer thickness ratio of gradient structure were optimized. The Vickers hardness, flexural strength and fracture toughness of T3-1 gradient composite ceramic tool material with layer thickness ratio of 1 were (20.57±0.22) GPa, (938.47±15.3) MPa, and (9.37±0.23) MPa·m1/2, respectively. Compared with the homogeneous composite ceramic tool material TBA7 with the best Al2O3 fiber content, the Vickers hardness, flexural strength and fracture toughness increased by 5%, 10.84% and 11.15%, respectively. The residual compressive stress and Al2O3 fiber produced in the surface layer of the gradient structure with appropriate layer thickness ratio further refined the matrix grain. The mixed fracture mode of transgranular fracture in the surface layer and intergranular fracture in the middle layer improved the mechanical properties, and the pull-out of the fiber and the dimples produced enhanced the strength and toughness of the material. The mechanical properties of the material were improved by the joint toughening of gradient structure and fiber.
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