Friction coefficient and sliding wear of AlTiN coating under various lubrication conditions
Friction coefficient and sliding wear of AlTiN coating under various lubrication conditions
复制标题
DOI：
10.1016/j.wear.2013.03.050
复制
发表时间：
2013-07-15
期刊：
影响因子：
5
通讯作者：
Kim, Dave (Dae-Wook)
中科院分区：
文献类型：
--
作者：
Wang, Xin;Kwon, Parick Y.;Kim, Dave (Dae-Wook)
AlTiN 涂层因在环境空气下的摩擦测试中具有高摩擦系数和高磨损率而闻名。在本研究中，使用 WC/6%Co 球在球和涂层之间进行相对振荡运动的球盘摩擦测试来检查 AlTiN (Al:Ti =3:2) 涂层的摩擦和磨损行为。测试在各种润滑条件下进行：环境空气、除湿空气、自来水、去离子水、油和丙酮。使用扫描电子显微镜 (SEM) 图片来捕捉磨损轨迹。结果表明，AlTiN涂层的高摩擦系数是由于在磨损轨迹上形成摩擦膜而引起的，这种现象仅发生在含水或水蒸气的环境下。对于不存在水的其他条件，在磨损轨迹上没有观察到摩擦膜并且获得低摩擦系数。对于形成摩擦膜的情况，摩擦膜的去除导致摩擦系数恢复到摩擦膜形成之前存在的低值。能量色散 X 射线光谱 (EDX) 已用于分析摩擦膜和磨损碎片的成分。结果表明，摩擦膜主要由Al、Ti、W、C、Co和O组成。然而，摩擦膜中O的浓度远高于仅由金属氧化物预期的浓度。据信，摩擦膜中的高 O 浓度是由磨损碎片与环境中的水或水蒸气相互作用引起的。这被认为是形成摩擦膜的基本要求。磨损轨迹末端堆积的磨屑主要具有超细粒度。 AlTiN 涂层的典型磨损被认为是由剥落、犁耕和氧化引起的。然而，AlTiN涂层在去离子水润滑条件下磨损得更快，这与腐蚀磨损有关。 (C) 2013 Elsevier B.V. 保留所有权利。
AlTiN coatings are known for having a high friction coefficient and a high wear rate during tribo-testing under ambient air. In this study, the friction and wear behavior of AlTiN (Al:Ti =3:2) coating is examined using a ball-on-disk tribo-test with a WC/6%Co ball in an oscillatory relative motion between the ball and the coating. The tests are conducted under various lubrication conditions: ambient air, dehumidified air, tap water, deionized water, oil and acetone. Scanning electron microscope (SEM) pictures were used to capture the wear track. The results indicated that the high friction coefficient of AlTiN coating was caused by the formation of a tribo-film on the wear track, which only occurred under the environments containing water or water vapor. For the other conditions without the presence of water, the tribo-film was not observed on the wear track and low friction coefficients were obtained. For the cases in which a tribo-film formed, the removal of the tribo-film caused friction coefficient to revert back to the low value that existed before the tribo-film formation. Energy-dispersive X-ray spectroscopy (EDX) has been used to analyze the composition of the tribo-film and wear debris. The results showed that the tribo-film was mainly composed of Al, Ti, W, C, Co and O. However, the O concentration in the tribo-film was much higher than the concentration expected solely from the metal oxides. It is believed that the high O concentration in the tribo-film was caused by the interaction of wear debris with the water or water vapor from the environment. This is believed to be an essential requirement for the formation of the tribo-film. The wear debris accumulated at the end of the wear track mainly had an ultra-fine grain size. The typical wear of the AlTiN coating was believed to be caused by spalling, ploughing and oxidation. However, AlTiN coating wore much faster under a deionized water lubrication condition, which is related to the corrosion wear. (C) 2013 Elsevier B.V. All rights reserved.