ZrB₂/SiC ceramic granules with uniform a size and spherical shape were prepared by spray drying technology. ZrB₂/SiC ceramic granules were added into ceramic matrix, and ZrB₂/SiC/Si₃N₄ ceramic tool materials with double composite architectures were prepared by spark plasma sintering technology. The mechanical properties from room temperature to 1100°C were measured. The hardness, flexural strength and fracture toughness at room temperature are 18.0 GPa, 589.0 MPa and 5.93 MPa m^1/2, respectively. While the fracture toughness at 1100°C reach 6.1 MPa m^1/2 increase by 74.3% compared with the ceramic tool material without double composite architectures. At high temperature, the improvement of fracture toughness is due to the addition of ZrB₂/SiC ceramic granules that deflect the cracks and propagates along the boundary between the granules and the matrix, which greatly increase the path during the crack propagation process, thereby improving the fracture toughness of the ceramic tool material.

采用喷雾干燥技术制备了粒径均匀、球形的ZrB ₂ /SiC陶瓷颗粒。在陶瓷基体中加入ZrB ₂ /SiC陶瓷颗粒，采用放电等离子烧结技术制备了ZrB ₂ /SiC/Si ₃ N ₄双重复合结构陶瓷刀具材料。测量了从室温到 1100°C 的机械性能。室温下的硬度、弯曲强度和断裂韧性分别为18.0 GPa、589.0 MPa和5.93 MPa m ^1/2。而在 1100°C 下的断裂韧性达到 6.1 MPa m ^1/2与没有双复合结构的陶瓷刀具材料相比，增加了 74.3%。在高温下，断裂韧性的提高是由于ZrB ₂ /SiC陶瓷颗粒的加入使裂纹偏转并沿颗粒与基体的边界传播，大大增加了裂纹扩展过程中的路径，从而提高了陶瓷刀具材料的断裂韧性。