(1. 中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083；
2 五邑大學(xué) 化學(xué)與環(huán)境工程系， 江門 529020)
摘 要: 用點(diǎn)接觸顯微鏡在納米尺度上研究了碳化硼材料的磨損特性， 考察了熱壓碳化硼及經(jīng)1073K預(yù)氧化處理1h的兩種試樣的磨損深度隨載荷、 磨損次數(shù)、 掃描速度等的變化關(guān)系。 結(jié)果表明: 未經(jīng)預(yù)氧化的碳化硼試樣的磨損深度很小，而經(jīng)過預(yù)氧化處理的碳化硼試樣的磨損深度遠(yuǎn)遠(yuǎn)大于未經(jīng)氧化的試樣；兩者的磨損深度均隨載荷的增加而顯著增加；未經(jīng)氧化的碳化硼試樣由于其在縱向上的結(jié)構(gòu)是均勻的， 磨損深度隨磨損次數(shù)的增加呈線性增加，經(jīng)氧化處理的碳化硼試樣的磨損深度隨磨損次數(shù)的增加呈現(xiàn)兩段線性關(guān)系， 可推斷表層的H3BO3膜厚度為120~140nm； 這兩種試樣的磨損深度均與掃描速度無明顯關(guān)系。
關(guān)鍵字: 碳化硼；納米摩擦；磨損深度；預(yù)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
