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纳米高岭土作为润滑添加剂的减摩行为

DOI: 10.7521/j.issn.0454-5648.2014.04.14

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Abstract:

将经油酸改性的纳米高岭土用作润滑添加剂,利用四球摩擦试验机研究了其在#40机油中的减摩行为。利用扫描电子显微镜、X射线光电子能谱仪、Fourier变换红外光谱仪、Raman光谱仪、比表面积测定仪和热重分析仪等手段对摩擦接触面和摩擦前后纳米颗粒的性质进行表征。结果表明润滑油中的纳米颗粒粘附在摩擦接触面上,并与摩擦副发生摩擦化学反应,最终在摩擦接触面上生成富含Si、Al、Fe、O和C等元素化合物的自修复保护膜,阻止摩擦副间直接接触,从而降低摩擦、减少磨损;尤其当纳米颗粒在基础油中的质量分数为1.0%时,摩擦副的平均摩擦系数和磨斑直径最小,与纯基础油时相比,分别降低了约23%和16%,且表面更为平整、犁沟更浅。与摩擦前相比,摩擦后的纳米高岭土性质(如颗粒尺寸、晶体结构等)也有所变化。另外,讨论了在润滑油中纳米高岭土的减摩原理。

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