硅灰石的表面改性对其填充PTFE复合材料摩擦学性能和力学性能的影响  

THE INFLUENCE OF SURFACE MODIFICATION OF WOLLASTONITE ON THE TRIBOLOGICAL AND MECHANICAL PROPERTIES OF ITS PTFE COMPOSITES

作　　者：孙庆杰[1] 冯新[1] 王海棠[1] 史以俊[1] 汪怀远[1] 陆小华[1] 

机构地区：[1]南京工业大学材料化学工程重点实验室,南京210009

出　　处：《工程塑料应用》2008年第8期13-16,共4页Engineering Plastics Application

基　　金：国家863计划资助项目(2003AA333010);国家自然科学基金资助项目(20246002)

摘　　要：利用钛酸酯偶联剂、硅烷偶联剂和硬脂酸对硅灰石进行表面改性,并对改性后的硅灰石进行类似与聚四氟乙烯(PTFE)复合加工过程中的热处理,测量其处理前后填料与水的接触角的变化,同时还考察了3种改性剂对PTFE/硅灰石复合材料的摩擦学性能和力学性能的影响。结果表明,硅烷偶联剂改性的硅灰石经过热处理后与水的接触角由64.5°增加到126.5°,表面能接近PTFE基体,相比其它改性剂能够更有效地提高复合材料的摩擦学性能和力学性能。The surface of wollastonite was modified by titanate, silane and stearic acid respectively. Then the modified wollastonite underwent heat treatment which was similar to hot processing of composites , and the water contact angle of the modified wollastonite both heat treatment or not were measured. Meanwhile, the influence of surface modification of wollastonite on the tribological and mechanical properties of its PTFE （PTFE/wollastonite） composites was also studied. Experiment results showed that the contact angle of silane modified wollastonite increased from 64.5° to 126.5°, the surface energy was even closed to matrix. Compared with other modifiers, silane could improve the tribological and mechanical properties of PTFE/wollastonite composites more effectively.

关 键 词：硅灰石 聚四氟乙烯 复合材料 摩擦磨损 表面改性 热处理 

分 类 号：TQ264.12[化学工程—有机化工] TB332[一般工业技术—材料科学与工程]