In order to improve the mechanical property of self-lubricating ceramic cutting tool, (W,Ti)C based ceramic composites with the additions of nano-sized CaF₂ solid lubricants were produced by vacuum hot pressing. Results showed that nano-sized CaF₂ was mainly located in matrix grains and formed the intragranular self-lubricating nanostructure. The optimal mechanical properties were achieved at 1650 °C and 15 min. The flexural strength, hardness and fracture toughness reaches the maximum of 497 MPa, 16.3GPa and 6.48 MPa·m^1/2, respectively. Compared with the ceramic composite without CaF₂, the fracture toughness was increased by 13.0%. Dry machining tests of hardened 40Cr steel were performed with these ceramic cutting tools. It indicated that with the additions of nano-sized CaF₂ as solid lubricant, the main cutting force and cutting temperature were reduced by 13.2% and 26.9%, the average friction coefficient of rake face was reduced from 0.59 to 0.32. SEM micrograph showed that a self-tribofilm was consistently formed on the rake wear area which has a good self-lubricating effect.

为提高自润滑陶瓷刀具的力学性能，采用真空热压法制备添加纳米CaF ₂固体润滑剂的(W,Ti)C基陶瓷复合材料。结果表明，纳米尺寸的CaF ₂主要位于基体晶粒中，形成了晶内自润滑纳米结构。最佳机械性能是在 1650 °C 和 15 分钟时实现的。弯曲强度、硬度和断裂韧性分别达到最大值497 MPa、16.3GPa和6.48 MPa·m ^1/2。与不含CaF ₂的陶瓷复合材料相比，断裂韧性提高了13.0%。使用这些陶瓷刀具对硬化的 40Cr 钢进行干加工试验。结果表明，加入纳米级CaF ₂作为固体润滑剂后，主切削力和切削温度分别降低了13.2%和26.9%，前刀面平均摩擦系数从0.59降低到0.32。SEM显微照片表明，在前刀磨损区域一致形成自摩擦膜，具有良好的自润滑效果。