Role of Third Bodies in Friction Behavior of Diamond-like Nanocomposite Coatings Studied by In Situ Tribometry
Role of Third Bodies in Friction Behavior of Diamond-like Nanocomposite Coatings Studied by In Situ Tribometry
复制标题
DOI：
10.1080/10402000208982561
复制
发表时间：
2002-01
影响因子：
2.1
通讯作者：
Thomas W. Scharf;I. L. Singer
中科院分区：
文献类型：
--
作者：
Thomas W. Scharf;I. L. Singer
使用自制的原位摩擦磨损试验机研究了非晶态类金刚石纳米复合材料 (DLN) 涂层 (C:H:Si:0) 在低速干滑动接触中的摩擦和磨损行为。测试是在干燥（∼4% RH）和潮湿（35 至 52% RH）空气中以 0.7 和 1.1 GPa 的接触应力对蓝宝石和钢半球进行往复滑动。原位目视观察确定了第三体过程如何影响 DLN 涂层的摩擦行为。对于所有测试条件，在第一个循环期间，蓝宝石半球上开始形成转移膜，并且在转移膜的进一步形成期间摩擦系数下降。视频分析显示大部分滑动发生在半球上的转移膜和 DLN 涂层之间。这种速度调节模式（界面滑动）导致稳态摩擦系数在 0.03 到 0.05 之间，在高应力和低相对湿度下获得较低的值。当转移膜破裂时，摩擦力开始峰值 (0.1 ≤ μ ≤ 0.5)；在峰值期间，第三物体的剪切也有助于速度调节，因为碎片在半球和轨道之间附着、分离和再循环。随后，由于转移膜的重组和破裂，摩擦系数分别在低值和高值之间波动。
The friction and wear behavior of amorphous diamond-like nanocomposite (DLN) coatings (C:H:Si:0) in low speed, dry sliding contact has been investigated using a home-built in situ tribometer. Tests were performed under reciprocating sliding against sapphire and steel hemispheres in dry (∼4% RH) and moist (35 to 52% RH) air at contact stresses of 0.7 and 1.1 GPa. In situ visual observations identified how third body processes affected the friction behavior of DLN coatings. For all test conditions, a transfer film began to form on the sapphire hemisphere during the first cycle, and the coefficient of friction dropped during further buildup of the transfer film. Video analysis showed most of the sliding motion took place between the transfer film on the hemisphere and the DLN coating. This velocity accommodation mode, interfacial sliding, was responsible for steady-state friction coefficients between 0.03 and 0.05 with lower values obtained at high stress and low RH. When the transfer film broke up the friction began to spike (0.1 ≤ μ ≤ 0.5); during the spikes, shearing of third bodies also contributed to velocity accommodation, as debris attached, detached and recirculated between the hemisphere and the track. Subsequently, the friction coefficient fluctuated between low and high values due to reformation and breakup of the transfer film, respectively.