Characterization and tribological evaluation of MW-PACVD diamond coatings deposited on pure titanium
Characterization and tribological evaluation of MW-PACVD diamond coatings deposited on pure titanium
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DOI：
10.1016/s0921-5093(99)00782-0
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发表时间：
2000-04-30
期刊：
影响因子：
6.4
通讯作者：
Hing, P
中科院分区：
文献类型：
--
作者：
Fu, YQ;Yan, BB;Hing, P
钛合金在航空航天和生物医学领域有着广泛的应用，但其摩擦学性能较差。沉积附着力良好的金刚石涂层是解决这一问题的一种很有前途的方法。本文采用微波等离子体辅助化学气相沉积法（MW-PACVD）在纯钛表面沉积金刚石涂层。采用扫描电子显微镜（SEM）、激光轮廓仪、拉曼光谱、掠入射X射线衍射（GIXD）和原子力显微镜（AFM）对金刚石涂层进行表征。采用球-盘磨损试验机（与Al 2 O3球滑动）和划痕试验机（与金刚石针滑动）评价了金刚石涂层的摩擦学性能。结果表明，多晶金刚石涂层的摩擦磨损性能和摩擦副的磨损量与表面粗糙度、金刚石涂层的形貌和晶体结构以及摩擦副材料密切相关。对于表面粗糙、具有尖锐微凸体的（111）织构金刚石涂层，与Al_2 O_3球的摩擦系数远高于（100）织构涂层，其摩擦副材料的磨损量较大。金刚石涂层抛光后，其表面粗糙度、摩擦系数和磨损量显著降低。当与金刚石销摩擦时，金刚石涂层的摩擦系数较低且稳定。为了提高金刚石涂层的摩擦学性能，提出了一种三步沉积法在金刚石涂层上获得光滑的纳米金刚石层。这样形成的金刚石涂层显示出最高的承载能力，最低的摩擦系数和最低的磨损的配合面。(C)2000 Elsevier Science S.A. All rights reserved.
Titanium alloys are widely used in aerospace and biomedical conditions, however, they are notorious for the poor tribological properties. The deposition of a well adherent diamond coating is a promising way to solve this problem. Ln this study, diamond coatings were deposited on pure titanium using microwave plasma assisted chemical vapour deposition (MW-PACVD). Characterisation of diamond coatings was performed using scanning electron microscopy (SEM), laser profilometry, Raman spectroscopy, grazing incidence X-ray diffraction (GIXD) and atomic force microscopy (AFM). Tribological properties of diamond coatings were evaluated using a ball-on-disk wear tester (sliding with Al2O3 balls) and a scratch tester (sliding with diamond pin). Results showed that the friction and wear properties of polycrystalline diamond coatings as well as the wear of the counterface were dependent significantly on the surface roughness, the morphology and crystalline structure of diamond coatings as well as the counterface materials. For (111)-textured diamond coatings with rough surface and sharp asperities sliding with Al2O3 balls, the coefficient of friction was much higher than that of (100)-textured coatings, and the wear of the counterface material was quite high. After polishing the diamond coating, the surface roughness, coefficient of friction and wear of counterface decreased significantly. If sliding with diamond pins, the coefficient of friction of diamond coating shows a quite low and stable value. To improve the tribological properties, a three-step deposition method was proposed to obtain a smooth and nano-crystalline diamond layer on bulk diamond coatings. The so-formed diamond coating showed the highest load bearing capacity, the lowest coefficient of friction and the lowest wear of the counterface. (C) 2000 Elsevier Science S.A. All rights reserved.