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Ag-MoS2復合材料電磨損表面膜結(jié)構和形成機理研究
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Structure and Formation Mechanism of Surface Film of Ag-MoS2 Composite during Electrical Sliding Wear
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Supported by National Natural Science Foundation of China (50741003); Key Project of Science and Technology of Ministry of Education of China (107066) and Anhui Provincial Natural Science Foundation (070414181)

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    摘要:

    采用粉末冶金方法制備了Ag-MoS2復合材料。初壓壓力300 MPa，在H2保護氣氛下燒結(jié)并保溫1 h，經(jīng)500 MPa壓力的復壓過程制得復合材料，用XRD對燒結(jié)后的材料進行了物相分析。對材料進行電磨損實驗，并對磨損后的材料表面進行XPS分析。結(jié)果表明，復合材料在燒結(jié)過程中Ag基體和MoS2并未發(fā)生化學反應，而在磨損過程中，由于電流和化學作用，材料表面產(chǎn)生了MoO3，MoO2，同時由粘著作用從對磨環(huán)轉(zhuǎn)移到電刷表面的銅與大氣分子發(fā)生化學反應產(chǎn)生了Cu2O, CuO and Cu2S。表面膜的存在降低了材料的摩擦系數(shù)，影響著材料的電磨損性能。

    Abstract:

    Ag-MoS2 composite brushes were fabricated by means of powder metallurgy process. The composite was detected by the method of XRD after sintering, and the worn surface of the brush was analyzed by XPS after the wearing experiments with current. Results showed that the components of the composite didn’t change during sintering, but the surface components of it changed upon wearing and some matters such as MoO3 and MoO2 were produced. At the same time, Cu2O, CuO and Cu2S were detected due to the adhesion transfer of elemental Cu from the slipping ring to the brush surface and the reaction between the elemental Cu and the ambient air molecules. During electrical sliding wearing, the surface film can reduce the friction coefficient and be beneficial to the frictional performance of the material

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李 庶,鳳 儀,楊茜婷,陳淑嫻,王 娟. Ag-MoS2復合材料電磨損表面膜結(jié)構和形成機理研究[J].稀有金屬材料與工程,2009,38(11):1881~1885.[Li Shu, Feng Yi, Yang Xiting, Chen Shuxian, Wang Juan. Structure and Formation Mechanism of Surface Film of Ag-MoS2 Composite during Electrical Sliding Wear[J]. Rare Metal Materials and Engineering,2009,38(11):1881~1885.]
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  • 收稿日期:2009-02-14
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