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首页> 外文会议>American Society of Mechanical Engineers(ASME)/Society of Tribologists and Lubrication Engineers(STLE) International Joint Tribology Conference; 20071022-24; San Diego,CA(US) >EFFECT OF TRIBOCHEMICAL INTERACTIONS ON FRICTION AND WEAR OF HIGHLY HYDROGENATED DLC FILMS
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EFFECT OF TRIBOCHEMICAL INTERACTIONS ON FRICTION AND WEAR OF HIGHLY HYDROGENATED DLC FILMS

机译：摩擦相互作用对高加氢DLC薄膜摩擦磨损的影响

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摘要

In this paper, we attempted to elucidate the nature and extent of tribochemical interactions between sliding surfaces of highly-hydrogenated diamondlike carbon (DLC) films (containing about 40 at.% hydrogen) and correlated these findings with their friction and wear behaviors in dry and humid nitrogen environments. For the tribochemical studies, we used a time-of-flight secondary ion mass spectrometer (ToF-SIMS) in 2- and 3-D imaging modes, while for tribological tests, we used a ball-on-disk machine that was operated under a 5 N load and at sliding velocities of 0.2 to 0.3 m/s. In dry nitrogen, the DLC films provided a friction coefficient of ≈ 0.007, but in humid nitrogen, the friction coefficient 3 to 4 times higher. 3-D surface profilometry and optical microscopy did not reveal much wear on sliding ball and disk surfaces after the tests regardless of the test environment, but the 2- and 3-D ToF-SIMS images of the same surfaces revealed very rich tribochemistry for films tested in humid nitrogen but not much chemistry for those films tested in dry nitrogen. Complementary x-ray photoelectron spectroscopy of these sliding surfaces showed similar results further confirming extensive tribo-oxidation (in the forms of both C-0 and C=O) of DLC surfaces tested in humid nitrogen but no major chemical changes in DLC films tested in dry nitrogen. Based on the results of surface analytical and tribological studies, we concluded that superlow friction behavior of highly hydrogenated DLC films was perhaps due to the hydrogen termination of their surface carbon atoms, while the much higher friction coefficients observed in humid nitrogen was primarily due to tribo-oxidation and/or oxygen termination of these surfaces.
机译：在本文中，我们试图阐明高度氢化的类金刚石碳（DLC）膜（含氢约40 at。％）的滑动表面之间的摩擦化学相互作用的性质和程度，并将这些发现与其在干燥和干燥状态下的摩擦和磨损行为相关联。潮湿的氮气环境。对于摩擦化学研究，我们使用飞行时间二次离子质谱仪（ToF-SIMS）进行2和3D成像模式，而对于摩擦学测试，我们使用了在5 N负载，滑动速度为0.2到0.3 m / s。在干燥的氮气中，DLC薄膜的摩擦系数约为0.007，而在潮湿的氮气中，摩擦系数则高3至4倍。无论测试环境如何，在进行测试后，3-D表面轮廓测定法和光学显微镜均未显示出滑动球和磁盘表面的磨损，但相同表面的2-D和3-D ToF-SIMS图像显示出非常丰富的薄膜摩擦化学在潮湿的氮气中测试的薄膜，但对于在干燥的氮气中测试的薄膜没有太多化学反应。这些滑动表面的互补X射线光电子能谱显示了相似的结果，进一步证实了在潮湿的氮气中测试的DLC表面发生了广泛的摩擦氧化（以C-0和C = O的形式），但在测试的DLC膜中没有发生重大化学变化干燥氮气。根据表面分析和摩擦学研究的结果，我们得出结论，高度氢化的DLC膜的超低摩擦行为可能是由于其表面碳原子的氢封端，而在潮湿的氮气中观察到的高得多的摩擦系数则主要是由于摩擦-这些表面的氧化和/或氧终止。

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