Xiong D S, Lin J M, Fan D L
Department of Materials Science & Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.
Biomed Mater. 2006 Sep;1(3):175-9. doi: 10.1088/1748-6041/1/3/013. Epub 2006 Aug 25.
Nano-Al(2)O(3)/ultra-high molecular weight polyethylene (UHMWPE) composites were prepared by hot pressing and then radiated by a gamma ray in doses of 120 kGy, 250 kGy and 500 kGy. The hardness of the composites was tested. The friction and wear properties against a CoCrMo alloy were also tested on a knee simulator under physiological saline solution lubrication. The morphologies of worn surfaces were examined under an optical microscope. The structure of the sample was analyzed by IR and XRD tests. The results showed that the wear rate of UHMWPE decreased when filled with a proper amount of nano-Al(2)O(3), and with an increment of the radiation dose of gamma rays. It was found that filling nano-Al(2)O(3) into UHMWPE can inhibit the effect of oxidation during the radiation procedure.
通过热压制备纳米Al₂O₃/超高分子量聚乙烯（UHMWPE）复合材料，然后用剂量为120 kGy、250 kGy和500 kGy的γ射线进行辐照。测试了复合材料的硬度。还在膝关节模拟器上于生理盐水润滑条件下测试了其对CoCrMo合金的摩擦磨损性能。在光学显微镜下检查磨损表面的形貌。通过红外光谱（IR）和X射线衍射（XRD）测试分析样品的结构。结果表明，当填充适量纳米Al₂O₃时，UHMWPE的磨损率降低，且随着γ射线辐照剂量的增加而降低。研究发现，在UHMWPE中填充纳米Al₂O₃可以抑制辐照过程中的氧化作用。
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