Friction and Wear Mechanisms of Tungsten-Carbon Systems: A Comparison of Dry and Lubricated Conditions
Friction and Wear Mechanisms of Tungsten-Carbon Systems: A Comparison of Dry and Lubricated Conditions
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DOI：
10.1021/am4010094
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发表时间：
2013-07-15
影响因子：
9.5
通讯作者：
Dienwiebel, Martin
中科院分区：
文献类型：
--
作者：
Stoyanov, Pantcho;Stemmer, Priska;Dienwiebel, Martin
采用实验和模拟相结合的方法研究了钨/碳化钨滑动系统中剪切机械混合第三体（TB）的展开。实验中，使用在线摩擦计研究了干滑动和润滑滑动的地形演变和摩擦响应。非原位x射线光电子能谱、透射电镜和截面聚焦离子束对表面结构和化学变化的分析表明，钨与碳化钨的干滑动导致钨表面塑性变形，导致晶粒细化，并在WC表面形成机械混合层。用十六烷作为润滑剂滑动，由于耗散的摩擦功率低得多，导致不太明显的第三体形成。滑动偶的分子动力学模拟预测了表面附近的化学变化，与实验观察到的界面过程一致。最后，在线地形测量表明，在滑动过程中，粗糙度的演变与摩擦阻力之间存在良好的相关性。
The unfolding of a sheared mechanically mixed third-body (TB) in tungsten/tungsten carbide sliding systems is studied using a combination of experiments and simulations Experimentally, the topographical evolution and the friction response, for both dry and lubricated sliding, are investigated using an online tribometer. Ex situ X-ray photoelectron spectroscopy, transmission electron microscopy, and cross-sectional focused ion beam analysis of the structural and chemical changes near the surfaces show that dry sliding of tungsten against tungsten carbide results in plastic deformation of the tungsten surface, leading to grain refinement, and the formation of a mechanically mixed layer on the WC counterface. Sliding with hexadecane as a lubricant results in a less pronounced third-body formation due to much lower dissipated frictional power. Molecular dynamics simulations of the sliding couples predict chemical changes near the surface in agreement with the interfacial processes observed experimentally. Finally, online topography measurements demonstrate an excellent correlation between the evolution of the roughness and the frictional resistance during sliding.