Gispert M P, Serro A P, Colaço R, Pires E, Saramago B
Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
J Biomed Mater Res B Appl Biomater. 2008 Jan;84(1):98-107. doi: 10.1002/jbm.b.30849.
The effect of roughness on the tribological behavior of the prosthetic pair ultra high molecular weight polyethylene (UHMWPE)/TiN coated stainless steel was investigated. Standard and polished TiN coated stainless steel pins were tested against either standard or smooth UHMWPE disks. Hanks' Balanced Salt Solution (HBSS) and bovine serum albumin (BSA) solution in HBSS were used as lubricants. Friction and wear were determined using a pin-on-disk apparatus and the wear mechanisms were investigated through optical microscopy, scanning electron microscopy, and atomic force microscopy. The results showed that the decrease in the roughness led to a reduction of the friction coefficient and of the wear rate of UHMWPE. However, the most important effect was achieved through the decrease in the roughness of the hard TiN counterface while keeping the standard UHMWPE surface. If BSA was added to HBSS, a strong decrease of both the friction coefficient and the polymeric wear was observed independently of the roughness of both the TiN and the polyethylene surfaces. Abrasive and fatigue wear mechanisms are proposed to interpret the experimental results.
研究了粗糙度对超高分子量聚乙烯（UHMWPE）/氮化钛涂层不锈钢假体摩擦副摩擦学行为的影响。用标准和抛光的氮化钛涂层不锈钢销与标准或光滑的UHMWPE盘进行测试。将汉克斯平衡盐溶液（HBSS）和HBSS中的牛血清白蛋白（BSA）溶液用作润滑剂。使用销盘式摩擦磨损试验机测定摩擦和磨损，并通过光学显微镜、扫描电子显微镜和原子力显微镜研究磨损机制。结果表明，粗糙度的降低导致UHMWPE摩擦系数和磨损率的降低。然而，最重要的影响是在保持标准UHMWPE表面的同时，通过降低硬质氮化钛对偶面的粗糙度来实现的。如果在HBSS中添加BSA，则观察到摩擦系数和聚合物磨损均显著降低，这与氮化钛和聚乙烯表面的粗糙度无关。提出了磨料磨损和疲劳磨损机制来解释实验结果。
