Combined Effects of Structural Transformation and Hydrogen Passivation on the Frictional Behaviors of Hydrogenated Amorphous Carbon Films
Combined Effects of Structural Transformation and Hydrogen Passivation on the Frictional Behaviors of Hydrogenated Amorphous Carbon Films
复制标题
结构转变和氢钝化对氢化非晶碳膜摩擦行为的联合影响
DOI：
10.1021/acs.jpcc.5b04533
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发表时间：
2015-07-16
影响因子：
3.7
通讯作者：
Wang, Hui
中科院分区：
文献类型：
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作者：
Chen, Yi-Nan;Ma, Tian-Bao;Wang, Hui
通过分子动力学（MD）模拟研究了氢化非晶碳（a-C:H）薄膜在单粗糙体接触下的摩擦学行为。研究发现氢浓度和法向载荷在 a-C:H 薄膜的摩擦行为中起着至关重要的作用。由于氢浓度较低，a-C:H 薄膜即使在非常低的法向载荷 (1.75 nN) 下也表现出高粘附力和摩擦力。在所有研究的氢浓度下，在 a-C:H 薄膜中都观察到 sp3 到 sp2 的再杂化，并且随着法向负载的增加，这种现象大大增强。在高法向载荷下，局部观察到纳米晶石墨烯类层状结构的形成，通常在瞬时接触区域下方，充当润滑剂，表现出由于压缩和剪切过程的综合作用而导致的局部石墨化。当氢浓度较高时，摩擦力随正常载荷呈线性增加，具有更高的承载能力。氢原子在薄膜表面积累...
Tribological behaviors of hydrogenated amorphous carbon (a-C:H) films under single asperity contact are investigated by molecular dynamics (MD) simulations. Hydrogen concentration and normal load are found to play essential roles in the frictional behavior of a-C:H films. With low hydrogen concentration, the a-C:H film shows high adhesion and friction even at very low normal loads (1.75 nN). The sp3-to-sp2 rehybridization is observed in the a-C:H films with all studied hydrogen concentrations, which is greatly enhanced with increasing normal load. At high normal loads, formation of nanocrystalline graphene-like lamellar structures is observed locally, usually beneath the instantaneous contact area, acting as a lubricating agent, demonstrating local graphitization due to combined effects of the compression and shear process. With high hydrogen concentration, the friction shows a linear increase along with the normal load and higher load bearing capability. Hydrogen atoms accumulate on the film surface duri...