| 摘要: |
| 将尺寸均匀的亚微米聚苯乙烯球（Φ 750 nm）自组装排列于硅基板表面，形成具有不同表面形貌特征的单层阵列薄膜。研究发现基板表面的微球在载荷作用下可发生滚动，实现滑动摩擦向滚动摩擦的转变，从而明显减小摩擦力，且聚苯乙烯球自身的弹性变形也是摩擦力减小的重要因素。3种典型样品即密排球阵列、非密排球阵列和硅基板的摩擦性能呈现明显的表面形貌依存性。其中非密排球阵列呈现最佳摩擦性能，在1 200 μN载荷下，非密排球阵列的摩擦因数为0.056，分别是密排球阵列和硅基板摩擦因数的73% 和63%。 |
| 关键词: 滚动 微纳米摩擦 表面形貌 |
| DOI： |
| 分类号: |
| 基金项目:国家重点基础研究发展计划（973计划）（2011CB707603） |
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| Topography-dependent Tribological Behavior of Sub-micron Polystyrene-sphere Arrays under Ultra Light Loads |
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QU Jiao, GE Shi-rong
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a. Institute of Tribology and Reliability Engineering, Mechanistic College, China University of Mining and Technology, b. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu
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| Abstract: |
| In this work, the uniform submicron polystyrene spheres (750 nm in diameter) have been arrayed on the surface of a Si substrate to form a monolayer film with various topographies. The spheres on the substrate can significantly reduce the friction force, mainly due to their rolling and elastic deformation. The tribological behavior of the samples, including closepacked and nonclosepacked sphere arrays and Si substrate, exhibits a significant topographydependence. The nonclosepacked arrays exhibit the best tribological performance, and its friction coefficient is 0.056 at the load of 1 200 μN, which is 73% and 63% that of closepacked arrays and Si substrate respectively. |
| Key words: rolling micro/nanoscale friction topography |
