Preliminary tribological evaluation of nanostructured diamond coatings against ultra-high molecular weight polyethylene
Preliminary tribological evaluation of nanostructured diamond coatings against ultra-high molecular weight polyethylene
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DOI：
10.1002/jbm.b.30926
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发表时间：
2008-04-01
影响因子：
3.4
通讯作者：
Eberhardt, Alan W.
中科院分区：
文献类型：
--
作者：
Hill, Michael R.;Catledge, Shane A.;Eberhardt, Alan W.
背景。关节假体的一些损失归因于与金属合金的聚乙烯关节磨损产生的碎片相关的溶骨性松动。据报道，使用陶瓷作为替代配合面可减少聚乙烯磨损。方法：采用富氢 (H-NSD) 和富氦 (He-NSD) 原料气混合物，通过微波等离子体辅助化学气相沉积在 Ti6Al4V 上沉积纳米结构金刚石 (NSD) 涂层。聚乙烯相对于 NSD 和 CoCr 的销盘磨损试验是在体温下的血清润滑中进行的。使用扫描电子显微镜检查表面形态，使用纳米压痕测定聚乙烯磨损表面的硬度和模量。对 NSD 涂层进行拉曼光谱、表面粗糙度和润湿性分析。结果：拉曼光谱证实 NSD 涂层中存在 SP2 和 SP3 键合碳。尽管与 CoCr 相比，He-NSD 和 H-NSD 涂层的粗糙度和摩擦系数更高，但 H-NSD、He-NSD 和 CoCr 上的聚乙烯之间的磨损系数没有显着差异。磨损测试后，金刚石涂层的接触角减小，表明这些表面变得更加亲水。在与 CoCr 铰接的销上观察到许多小突起，并且在 NSD 上的聚乙烯中观察到单个大突起。这些特征被推测为重新固结的聚乙烯颗粒。金刚石上聚乙烯的磨损聚乙烯表面的纳米压痕模量和硬度低于钴铬上聚乙烯。结论：作为聚乙烯的对抗面，NSD 涂层的 Ti6Al4V 在目前的销盘测试中产生的磨损系数与 CoCr 相当，这朝着其在关节置换轴承应用中的应用迈出了有希望的一步。 (0 2007 年 Wiley 期刊公司
Background. Some loss of joint prostheses has been attributed to osteolytic loosening associated with debris from wear of polyethylene articulating against metal alloys. Reduced polyethylene wear has been reported with ceramics serving as an alternative counterface. Methods: Nanostructured Diamond (NSD) coatings were deposited onto Ti6Al4V by microwave plasma-assisted chemical vapor deposition, with both hydrogen-rich (H-NSD) and helium-rich (He-NSD) feedgas mixtures. Pin-on-disk wear tests of polyethylene against NSD and CoCr were performed in serum lubrication at body temperature. Scanning electron microscopy was used to examine surface morphology, and nanoindentation was used to determine hardness and modulus of the polyethylene wear surfaces. Raman spectroscopy, surface roughness, and wettability analyses of the NSD coatings were performed. Results: Raman spectroscopy confirmed SP2 and SP3 bonded carbon in the NSD coatings. No significant differences in wear factors were found between polyethylene on H-NSD, He-NSD, and CoCr, despite higher roughness and friction coefficients for the He-NSD and H-NSD coatings, compared with CoCr. Contact angles for the diamond coatings were reduced following the wear tests, indicating that these surfaces became more hydrophilic. Numerous small protuberances were observed on pins articulated against CoCr, and a single, large protuberance was observed in polyethylene-on-NSD. These features were conjectured to be reconsolidated polyethylene particles. Nanoindentation modulus and hardness of the worn polyethylene surfaces were lower for polyethylene-on-diamond than for polyethylene-on-CoCr. Conclusions: As a counterface to polyethylene, NSD-coated Ti6Al4V produced wear factors comparable to CoCr in the present pin-on-disk tests, a promising step towards its use in joint replacement bearing applications. (0 2007 Wiley Periodicals, Inc.