交联聚四氟乙烯的耐磨性能研究

四氟

摘　要:采用电子束高温辐照制备交联聚四氟乙烯（XPTFE）,利用环-环立式万能摩擦磨损试验机在干摩擦条件下研究了PTFE和XPTFE的摩擦磨损性能变化规律。结果表明：与PTFE的摩擦系数相比,XPTFE的摩擦系数随剂量的增加而增加。随剂量的增加,XPTFE的耐磨性增大,当吸收剂量为150 kGy时,XPTFE耐磨性提高了近1 000倍。PTFE磨损表面光滑,磨屑为波浪形带状物;XPTFE的磨损表面形成摩擦棱,磨屑为粉状颗粒。XPTFE的三维网状交联结构导致其耐磨性能明显提高。
关键词:聚四氟乙烯 辐射交联 摩擦系数 耐磨性　　
唐忠锋[1]中国科学院上海应用物理研究所,上海201800 [2]广西工学院生物与化学工程系,广西柳州545006

Wear Resistance of Cross-linked PolytetrafluoroethyleneTang Zhongfeng,1.Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800）（2.Department of Biological and Chemical Engineering,Guangxi University of Technology,Liuzhou 545006,GuangxiAbstract:Cross-linked polytetrafluoroethylene（XPTFE） was prepared by electron beam irradiation at high temperature.The tribological behavior of the XPTFE sheet was investigated on a ring-on-ring tribometer under dry friction conditions.It was shown that the friction coefficient of XPTFE increased with the absorbed dose.The substantial improvement of the wear resistance of XPTFE is of particular interest.The wear resistance of XPTFE was improved by 3 orders of magnitude at a dose of 150 kGy.Scanning electron microscopy analysis revealed that,after the tribological test,the ground surface of the virgin PTFE sheet was smooth,and the debris was in the form of flakes;while the worn surface of XPTFE was rough,and the abraded debris was in the form of a fine powder.The three-dimensional network of XPTFE is responsible for its excellent wear resistance behavior.
Key words:polytetrafluoroethylene; radiation crosslinking; friction coefficient; wear resistance