Metals and Alloys, University of Bayreuth, Bayreuth, Bavaria, Germany.
J Biomed Mater Res B Appl Biomater. 2010 May;93(2):468-75. doi: 10.1002/jbm.b.31604.
The classical wear mechanisms abrasion, fatigue, and adhesion are the most frequent causes of surface changes of ultra high molecular weight polyethylene (UHMWPE) in artificial joints. The counterpart material has a strong influence on the wear and friction behavior of artificial joints due to its abrasive properties and adhesive interaction with UHMWPE. The formation of a transfer layer on the counterpart in UHMWPE bearing systems is often described as being a clear indication of strong adhesive forces. The influence of using a cobalt-chromium-molybdenum (CoCrMo) alloy, a titanium nitride plasma coating or an oxidized zirconium alloy on adhesive wear was studied. The surface free energy and the bonding forces of these counterpart materials to UHMWPE were investigated. Catalytic effects on the degradation behavior of polyethylene, the micro friction behavior, and the build-up and constitution of a transfer layer deposited under loads, and relative velocities that are relevant in knee joints were analyzed.
在人工关节中，超高分子量聚乙烯（UHMWPE）表面变化的最常见原因是经典的磨损机制，如磨损、疲劳和黏附。由于具有磨蚀性和与 UHMWPE 的黏附性相互作用，对磨材料对人工关节的磨损和摩擦行为有很大影响。在 UHMWPE 承载系统中，对磨副表面形成转移膜通常被认为是黏附力很强的明显迹象。研究了使用钴铬钼（CoCrMo）合金、氮化钛等离子涂层或氧化锆合金对黏附磨损的影响。研究了这些对磨材料与 UHMWPE 的表面自由能和结合力。分析了对聚乙烯降解行为、微摩擦行为以及在膝关节相关的负荷和相对速度下形成的转移膜的堆积和组成的催化作用。
