Hoffmann M, Gonzalez-Mora V, Chiesa R, Cigada A, Stroosnijder M F
Institute for Health and Consumer Protection, The European Commission, 21020 Ispra (Va), Italy.
Biomed Mater Eng. 2002;12(4):387-95.
A novel pin-on-disk type wear tester is described allowing a rapid screening of different types of polyethylene under both unidirectional and multidirectional sliding motion. The wear of four polyethylene materials sliding against a roughened CoCrMo alloy was evaluated: a non-irradiated UHMWPE, a UHMWPE irradiated with a dose of 25 kGy in air, and two types of crosslinked UHMWPE (100 kGy, air), which were subjected to a stabilization heat treatment in nitrogen at 155 degrees C for 72 hours (XLPE I) and in water at 130 degrees C for 72 hours (XLPE II), respectively.Under multidirectional sliding conditions both types of XLPE exhibited significantly less wear with respect to the 25 kGy irradiated UHMWPE and the non-irradiated UHMWPE, even under the rough counterface conditions applied. Under unidirectional sliding motion both types of XLPE exhibited the highest wear of all materials tested, because the orientation hardening effect acting under linear lubricated condition is less pronounced for crosslinked polyethylene.
本文描述了一种新型销盘式磨损试验机，它能够在单向和多向滑动运动条件下，对不同类型的聚乙烯进行快速筛选。研究评估了四种聚乙烯材料在粗糙的钴铬钼合金表面滑动时的磨损情况：一种未辐照的超高分子量聚乙烯（UHMWPE）、一种在空气中接受25 kGy剂量辐照的UHMWPE，以及两种交联UHMWPE（100 kGy，空气环境），后者分别在155℃的氮气环境中进行72小时的稳定化热处理（交联聚乙烯I，XLPE I）和在130℃的水环境中进行72小时的稳定化热处理（交联聚乙烯II，XLPE II）。在多向滑动条件下，即使在使用粗糙对磨面的情况下，两种类型的交联聚乙烯相对于25 kGy辐照的UHMWPE和未辐照的UHMWPE，磨损都显著减少。在单向滑动运动中，两种类型的交联聚乙烯在所有测试材料中磨损最高，这是因为在线性润滑条件下起作用的取向硬化效应对于交联聚乙烯来说不太明显。
