(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；
2 五邑大学 化学与环境工程系， 江门 529020)
摘 要: 用点接触显微镜在纳米尺度上研究了碳化硼材料的磨损特性， 考察了热压碳化硼及经1073K预氧化处理1h的两种试样的磨损深度随载荷、 磨损次数、 扫描速度等的变化关系。 结果表明: 未经预氧化的碳化硼试样的磨损深度很小，而经过预氧化处理的碳化硼试样的磨损深度远远大于未经氧化的试样；两者的磨损深度均随载荷的增加而显著增加；未经氧化的碳化硼试样由于其在纵向上的结构是均匀的， 磨损深度随磨损次数的增加呈线性增加，经氧化处理的碳化硼试样的磨损深度随磨损次数的增加呈现两段线性关系， 可推断表层的H3BO3膜厚度为120~140nm； 这两种试样的磨损深度均与扫描速度无明显关系。
关键字: 碳化硼；纳米摩擦；磨损深度；预氧化
（1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;
2. Department of Chemistry & Environment Engineering, Wuyi University,
Jiangmen 529020, China）
Abstract:The wear characteristics of boron carbide without and with pre-oxidation at 1073K for 1h were investigated with point contact microscope (PCM). The results show that boron carbide without pre-oxidation possesses excellent wear resistant capability. On the contrary, the wear depth of oxidized sample is much more deeper than that of without pre-oxidation one. For both samples, with and without pre-oxidation, the wear depth increases remarkably as the normal load rises, and the scanning speed has no notable effect on wear depth. The wear depth of the sample without oxidation increases linearly with scanning cycles, inferring that the sample is uniform longitudinally. The relation between the wear depth and scanning cycles on oxidized sample infers that the thickness of H3BO3 surface film is about 120-140nm.
Key words: boron carbide; nano tribology; wear depth; pre-oxidation
