原子氧辐照对填充聚酰亚胺复合材料结构和摩擦学性能的影响  

Effects of Atomic Oxygen Irradiation on the Surface Structure and Tribological Properties ofPolyimide Composites Filled with Solid Lubricant

作　　者：杨景锋[1] 裴先强[1] 王廷梅[1] 王齐华[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2009年第5期464-468,共5页Tribology

基　　金：国家自然科学基金资助项目(58805139)

摘　　要：采用热压成型制备了固体润滑剂填充改性的聚酰亚胺(PI)复合材料,用一定剂量的原子氧对改性的PI复合材料表面进行辐照处理.利用X-射线光电子能谱仪(XPS)和傅里叶红外光谱仪(FTIR-ATR)分析了辐照前后PI复合材料的结构变化,并采用UMT摩擦磨损试验机评价了原子氧辐照前后改性PI复合材料的摩擦学性能,最后用扫描电子显微镜(SEM)分析了PI复合材料的磨损表面.结果表明:原子氧辐照后PI复合材料的树脂以及填充相发生了一定程度的氧化,其表面树脂分子链发生了部分断裂和降解,表面粗糙、碎屑增多,导致复合材料的摩擦系数增大,摩擦学性能下降,辐照前后复合材料的磨损机理发生了变化,辐照前复合材料主要表现为黏着磨损,辐射后表现为轻微犁削和磨粒磨损.The polyimide （PI）composites filled with several solid lubricants were prepared by compression molding. The surfaces of polyimide composites were irradiated by a certain doses of atomic oxygen. The changes of surface structure of polyimide composites were characterized by Fourier transform infrared spectroscopy （ FTIR - ATR） and X- ray photoelectron spectroscopy （XPS）before and after irradiation, while the tribological behaviors were investigated by using a UMT wear tester at room temperature under ambient atmosphere. The surface and worn surface of the polyimide composite blocks before and after irradiation were observed by using scanning electron microscope （SEM）. Results indicated that the matrix and fillers in the PI composite surfaces were oxidized to some extent, whereas the molecule chain of the PI matrix and PTFE resin were partially destroyed during irradiation. The surface of the PI composites became rougher than that before irradiation. As a result, the friction coefficient of PI composites increased. The wear mechanism of PI composites changed from adhesive wear before irradiation to slight ploughing and abrasive wear after irradiation.

关 键 词：聚酰亚胺复合材料 原子氧辐照 表面结构 摩擦学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]