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Study on Tr.bological p.op.r.ies of Ir.adiated Cr.sslinking UHMWp. Nano-Comp.site

Jour.al of Bionic engineering 2009年第1期6卷 7-13页

作者： lei xiong, dang-sheng xiong, jia-bo jindepartment of materials science and engineering, nanjing university of science and technology, nanjing 210094, p. r. china [a]Dep.r.ment of materials science and engineering Nanjing University of Science and Technology Nanjing 210094 P. R. China

Ultr. High Molecular.Weight p.lyethylene(UHMWp.)has been widely used as a bear.ng mater.al for.ar.ificial joint r.p.acement over.for.y *** is usually cr.sslinked by gamma r.ys ir.adiation befor. its imp.antation into human *** this study,UHMWp. and UHMWp./nano-hydr.xyap.tite(n-HA)comp.site wer. p.ep.r.d by vacuum hot-p.essing *** p.ep.r.d materials wer. ir.adiated by gamma r.ys in vacuum and molten heat tr.ated in vacuum just after.*** effect of filling n-HA with gamma ir.adiation on tr.bological p.op.r.ies of UHMWp. was investigated by using fr.ction and wear.exp.r.mental machine(model MM-200)under.deionized water.***-mor.0}ology of wor. sur.ace was obser.ed by metallogr.p.ic *** angle and har.ness of the materials wer. also *** r.sults show that contact angle and har.ness ar. changed by filling n-HA and gamma *** coefficient and wear.r.te under.deionized water.lubr.cation ar. r.duced by filling *** fr.ction coefficient is incr.ased and wear.r.te is r.duced significantly by gamma *** wor. sur.ace of unfilled mater.al is mainly char.cter.zed as adhesive wear.and abr.sive wear.and that of n-HA filled mater.al is mainly char.cter.zed as abr.sive *** gamma ir.adiation,the degr.es of adhesive and abr.sive wear.for.unfilled mater.al and abr.sive wear.of n-HA filled mater.al ar. significantly *** and filled materials after.ir.adiation ar. mainly shown as slight fatigue *** r.sults indicate that UHMWp. and UHMWp./n-HA ir.adiated at the dose of 150 kGy can be used as bear.ng materials in ar.ificial joints for.its excellent wear.r.sistance comp.r.d to or.ginal UHMWp..

关键词： tr.bological p.op.r.ies ir.adiated cr.sslinking UHMWp. n-HA ar.ificial joints

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