不同分子结构聚酰亚胺固体润滑膜的摩擦学性能研究

制备了均苯型和单醚酐型两种分子结构的PI固体润滑膜，考察了两种PI膜的机械性能及摩擦学特性，研究了磨损机理和转移膜性质。试验结果显示，由于两种PI膜机械性能和摩擦过程中在偶面生成转移膜性质的不同，随摩擦次数的增加，均苯型PI膜摩擦因数不断升高，高载荷下失去润滑性；单醚酐型PI膜摩擦因数缓慢降低，高载荷下仍具有较好的润滑性。单醚酐型PI膜较好的摩擦性能与其分子结构有关系。

Tribological Properties of Polyimide Solid-lubricating Films with Different Structure

Polyimide solid- lubricating films were prepared on nickel substrate by sintering the corresponding poly precursor dipped coating. The chemical structure of PI, PMDA- ODA and ODPA- ODA was varied, The adhesion strength, microhardness, impact strength and toughness of the coating were examined, and the tribological properties were investigated under different sliding speed and load on MM- 200 model friction and wear testing machine. Scanning electron microscopy (SEM) was used to investigate the wear behavior of coating. The result showed that PI films with different structure displayed different friction and wear behavior at the same conditions. ODPA- ODA PI as flexible molecular chains showed excellent mechanical and tribological properties, and better lubricating performance at heavy load.