Friction and wear characteristics of hydrogenated diamond-like carbon films formed on the roughened stainless steel surface
Friction and wear characteristics of hydrogenated diamond-like carbon films formed on the roughened stainless steel surface
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DOI：
10.1016/j.wear.2010.03.013
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发表时间：
2010-05
期刊：
影响因子：
5
通讯作者：
A. Suzuki;Yusuke Aiyama;Maiko Tokoro;H. Sekiguchi;M. Masuko
中科院分区：
文献类型：
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作者：
A. Suzuki;Yusuke Aiyama;Maiko Tokoro;H. Sekiguchi;M. Masuko
利用球盘式摩擦磨损试验机研究了氢化类金刚石薄膜表面粗糙度对薄膜在空气和水环境中摩擦磨损性能的影响。采用等离子体增强化学气相沉积法在经氩等离子体溅射刻蚀的粗糙不锈钢基体上沉积类金刚石薄膜。沉积在光滑不锈钢基体上的类金刚石薄膜在空气和水环境中都表现出不稳定的摩擦行为。最终摩擦系数值在空气中为0.10至0.15，在水中为0.15至0.20。光滑的DLC膜在水中摩擦时，DLC膜从不锈钢基体上发生了大面积的线状脱层。在空气环境中，没有观察到大规模的分层，但可以看到DLC膜的磨损。水润滑条件下不锈钢球表面形成的磨痕比空气润滑条件下形成的磨痕大。与光滑的DLC膜相比，具有粗糙表面的DLC膜表现出稳定的摩擦行为。在水和空气环境中的摩擦系数分别约为0.1和0.2。对于粗糙的DLC膜，没有观察到大规模的DLC膜分层。虽然通过粗糙化DLC膜的表面来改善摩擦特性，但是随着DLC膜的表面粗糙度的增加，在球表面上形成的磨损疤痕变得更大。在粘度与水相近的正癸烷中的摩擦磨损试验结果表明，DLC膜的摩擦磨损行为不仅受流体动力学效应的影响，而且受DLC膜与水的相互作用的影响。DLC膜在水环境中通过摩擦化学反应由疏水性转变为亲水性。DLC膜在水润滑条件下的低摩擦磨损是由于DLC膜的结晶化所致。
The effects of the surface roughness of hydrogenated diamond-like carbon (DLC) films on friction and wear properties have been studied using a ball-on-disk type tribometer in air and water environments. Rough DLC films were formed by depositing DLC with the plasma-enhanced chemical vapor deposition method on roughened stainless steel substrate prepared by argon plasma sputter etching. DLC films deposited on a smooth stainless steel substrate showed unstable friction behavior in both air and water environments. The final friction coefficient values ranged from 0.10 to 0.15 in air and 0.15 to 0.20 in water. Line-shaped large-scale delamination of DLC film from stainless steel substrate was observed for smooth DLC films rubbed in water. In an air environment, large-scale delamination was not observed, but wear of the DLC film could be seen. The wear scar formed on the stainless steel ball under water lubrication was larger than that formed in air environment. In contrast to smooth DLC film, DLC films having a rough surface showed stable frictional behavior. The friction coefficients in water and air environments were approximately 0.1 and 0.2, respectively. No large-scale delamination of DLC film was observed for rough DLC films. Although friction characteristics were improved by roughing the surface of the DLC films, the wear scars forming on the ball surface became larger with increases in the surface roughness of the DLC film. From the results of the tribotest in n-decane, which has almost the same viscosity as water, it was suggested that not only the hydrodynamic effect but also the interaction between DLC films and water affect the friction and wear behavior. DLC films changed from hydrophobic to hydrophilic by tribochemical reaction in water environment. The low friction and wear of DLC films under water lubrication is considered to be caused by hydrophilication of the DLC films.