The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter
The Run-in Process for Stable Friction Fade-Out and Tribofilm Analyses by SEM and Nano-Indenter
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DOI：
10.2474/trol.12.274
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发表时间：
2017
期刊：
影响因子：
1
通讯作者：
M. Nosaka;Yushi Morisaki;Tomo Fujiwara;Hideaki Tokai;M. Kawaguchi;Takahisa Kato
中科院分区：
文献类型：
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作者：
M. Nosaka;Yushi Morisaki;Tomo Fujiwara;Hideaki Tokai;M. Kawaguchi;Takahisa Kato
作者在以前的报告中指出，当ZrO 2（Y PSZ：氧化钇部分稳定的氧化锆）销与类金刚石碳（DLC）膜在H2气体环境中在63.7N的重载荷下滑动时，摩擦系数达到0.0001的水平（摩擦衰减，FFO）。实验还表明，当H2气流与少量水-醇蒸汽混合时，FFO持续时间较长。在ZrO 2表面的接触区域形成了摩擦膜，认为水-醇蒸气使摩擦膜变得牢固。在本研究中，为实现更稳定的FFO的运行过程中进行了研究，通过不同的运行模式组成的负载升压和水-醇蒸气的添加，并实现了稳定的FFO持续几个小时的可重复性。然后，在摩擦磨损开始前后，用SEM观察了ZrO 2表面的接触面积，并测量了摩擦膜的纳米压痕硬度。它将被示出，由具有低熔化温度，低电导率和低纳米压痕硬度的烃类，如烃聚合物制成的物质形成在摩擦膜上，这表明在滑动表面处的烃类气体的演变。
It was shown in previous reports by authors that friction coefficients of the level of 0.0001 were achieved when ZrO 2 (Y-PSZ: yttria partially stabilized zirconia) pins were slid against diamond-like carbon (DLC) films in H 2 -gas environment under heavy applied load of 63.7 N (friction fade-out, FFO). It was also shown that FFO continued long when the main H 2 -gas flow was mixed with a small amount of aqueous-alcohol vapor. A tribofilm was formed at the contact area of ZrO 2 surface, and it was considered that the aqueous-alcohol vapor made the tribofilm strong. In the present research, the run-in process for achieving more stable FFO is investigated by varying the run-in pattern consisting of load step-up and aqueous-alcohol vapor addition, and the stable FFO continuing several hours is realized reproducibly. Then, before and after the FFO onset, the contact area on ZrO 2 surface is observed by SEM, and nano-indentation hardness of tribofilm is measured. It will be shown that a substance made of hydrocarbons with low melting temperature, low electrical conductivity and low nano-indentation hardness such as hydrocarbon polymers is formed on the tribofilm, suggesting the evolution of hydrocarbon gas at the sliding surface.