Excellent tribological behavior of hexadecylphosphonic acid films formed on titanium alloy

查看全文 作　　者：ZHANG [1]CaiXia;LIU [1]YuHong;WEN [1]ShiZhu

机构地区：[1]State Key Laboratory of Tribology, Tsinghua University

出　　处：《Science China(Technological Sciences)》索引2014年第57卷第9期,共8页

基　　金：supported by Tsinghua University Initiative Scientific Research Program(Grant No.2012Z02168);State Key Laboratory of Tribology,and Innovative Research Groups of the National Natural Science Foundation of China(Grant No.51321092) 摘　　要：Titanium alloy(Ti6Al4V)surfaces are generally modified to achieve some specific surface properties to satisfy requirements of clinical medicine.In our work,hexadecylphosphonic acid(HDPA)films were successfully formed on Ti6Al4V and subsequently confirmed by X-ray photoelectron spectroscopy(XPS)and atomic force microscopy(AFM)measurements.The tribological properties of the HDPA-modified Ti6Al4V were investigated using a ball-on-disk tribometer with a linear reciprocating movement.Experimental results indicate that the HDPA-modified Ti6Al4V can maintain a low friction coefficient(approximately 0.06)for 4 h when sliding against polytetrafluoroethylene(PTFE)balls under a load of 0.8 N in comparison to bare Ti6Al4V(approximately 0.2);the friction coefficient of the HDPA-modified Ti6Al4V shows a 70%decline.In addition,the wear rate of PTFE balls sliding against bare Ti6Al4V was almost twenty times that of PTFE balls sliding against the HDPA-modified Ti6Al4V.Moreover,results of tribological experiments for different speeds(from 3 to 24 mm/s)and loads(from 0.8 to 3.2 N)proved that the HDPA-modified Ti6Al4V was not sensitive to both velocity and load.The friction coefficients were still low and stable even under a high load of 3.2 N or at a high speed of 24 mm/s.This indicates that this soft modification is an optional method of improving tribological properties of Ti6Al4V. 关键词：摩擦学性能 TI6AL4V合金钛合金薄膜 X射线光电子能谱聚四氟乙烯乳酸原子力显微镜

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Excellent tribological behavior of hexadecylphosphonic acid films formed on titanium alloy

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