通过添加固体润滑剂h-BN,采用真空热压烧结工艺制备TiB2/WC/h-BN自润滑陶瓷材料,对其密度和力学性能进行测试,并采用XRD和SEM对材料的物相和显微结构进行分析.结果表明:TiB2/WC/h-BN自润滑陶瓷材料的相对密度为97.5％,抗弯强度、断裂韧性和维氏硬度分别为652MPa、4.5MPa·m1/2和14.8GPa.片状结构的固体润滑剂h-BN颗粒保存完整,分布均匀,而且可有效抑制基体TiB2晶粒的长大.材料的断裂模式是穿晶/沿晶断裂的混合型,以穿晶断裂为主.材料的增韧机理以裂纹偏转和裂纹桥联为主.TiB2/WC/h-BN自润滑陶瓷材料的摩擦因数低于0.3,与其他添加h-BN的自润滑陶瓷材料相比,具有良好的力学性能和摩擦性能.
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