Sliding wear and fretting wear of diamondlike carbon-based, functionally graded nanocomposite coatings
Sliding wear and fretting wear of diamondlike carbon-based, functionally graded nanocomposite coatings
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DOI：
10.1016/s0043-1648(98)00349-4
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发表时间：
1999-04
期刊：
影响因子：
5
通讯作者：
K. Miyoshi;B. Pohlchuck;K. Street;J. Zabinski;J. H. Sanders;A. Voevodin;R. Wu
中科院分区：
文献类型：
--
作者：
K. Miyoshi;B. Pohlchuck;K. Street;J. Zabinski;J. H. Sanders;A. Voevodin;R. Wu
改善类金刚石(DLC)薄膜的摩擦学功能--开发出良好的耐磨性、低摩擦和高承载能力-是本研究的目的。采用磁控溅射和脉冲激光沉积相结合的方法，在AISI440C不锈钢表面制备了由非晶态类金刚石(a-DLC)表层和功能梯度类金刚石(TiTixCy-DLC)底层组成的纳米复合涂层。用拉曼光谱、扫描电子显微镜和表面轮廓术对所制备的类金刚石膜进行了表征。本研究进行了滑动摩擦和微动磨损两种磨损实验。通过单向球盘滑动摩擦试验，考察了a-DLC/Ti-TixCy-DLC涂层AISI 440C不锈钢圆盘与直径6 mm的AISI 440C不锈钢圆盘在超高真空、干氮和潮湿空气中的滑动摩擦磨损行为。尽管涂层和球磨率在三种环境下都很低，但潮湿的空气和干燥的氮气对a-DLC顶层造成了轻微的磨损和抛光，而超高真空对a-DLC顶层和Ti-TixCy-DLC底层造成了相对严重的磨损和脆性断裂。作为参考，我们也用同样的方法研究了用离子束在a-DLC/Ti-TixCy-DLC纳米复合涂层上制备的非晶氢碳薄膜。H-DLC膜在不牺牲耐磨性的前提下，即使在超高真空条件下也能显著降低摩擦。在干燥的氮气和潮湿的空气中，H-DLC膜表现出与a-DLC/Ti-TixCy-DLC纳米复合涂层相似的行为，表现出低摩擦和低磨损的特点。微动磨损试验是在潮湿的空气中进行的，频率为80 Hz，振幅为75μm，在a-DLC/Ti-TixCy-DLC涂层的AISI440C盘片和钛-6wt.%铝-4wt.%钒(Ti-6Al-4V)平板上进行，两者均与直径9.4 mm的半球形Ti-6Al-4V销接触。A-DLC/Ti-6Al-4V材料副的抗微动磨损性能优于Ti-6Al-4V/Ti-6Al-4V材料副。
Improving the tribological functionality of diamondlike carbon (DLC) films-developing good wear resistance, low friction, and high load-carrying capacity-was the aim of this investigation. Nanocomposite coatings consisting of an amorphous DLC (a-DLC) top layer and a functionally graded titanium–titanium carbide–diamondlike carbon (Ti–TixCy–DLC) underlayer were produced on AISI 440C stainless steel substrates by the hybrid technique of magnetron sputtering and pulsed-laser deposition. The resultant DLC films were characterized by Raman spectroscopy, scanning electron microscopy, and surface profilometry. Two types of wear experiment were conducted in this investigation: sliding friction experiments and fretting wear experiments. Unidirectional ball-on-disk sliding friction experiments were conducted to examine the wear behavior of an a-DLC/Ti–TixCy–DLC-coated AISI 440C stainless steel disk in sliding contact with a 6-mm diameter AISI 440C stainless steel ball in ultrahigh vacuum, in dry nitrogen, and in humid air. Although the wear rates for both the coating and ball were low in all three environments, the humid air and dry nitrogen caused mild wear with burnishing in the a-DLC top layer, and the ultrahigh vacuum caused relatively severe wear with brittle fracture in both the a-DLC top layer and the Ti–TixCy–DLC underlayer. For reference, amorphous hydrogenated carbon (H-DLC) films produced on a-DLC/Ti–TixCy–DLC nanocomposite coatings by using an ion beam were also examined in the same manner. The H-DLC films markedly reduced friction even in ultrahigh vacuum without sacrificing wear resistibility. The H-DLC films behaved much like the a-DLC/Ti–TixCy–DLC nanocomposite coating in dry nitrogen and humid air, presenting low friction and low wear. Fretting wear experiments were conducted in humid air (approximately 50% relative humidity) at a frequency of 80 Hz and an amplitude of 75 μm on an a-DLC/Ti–TixCy–DLC-coated AISI 440C disk and on a titanium–6 wt.% aluminum–4 wt.% vanadium (Ti–6Al–4V) flat, both in contact with a 9.4-mm diameter, hemispherical Ti–6Al–4V pin. The resistance to fretting wear and damage of the a-DLC/Ti–6Al–4V materials pair was superior to that of the Ti–6Al–4V/Ti–6Al–4V materials pair.