边界润滑条件下丁腈橡胶—金属磨损机理的研究

对矿物油润滑下丁腈橡胶－金属的磨损机理进行了研究。用扫描电子显微镜和Ｘ射线光电子能谱仪分析了橡胶及金属磨损表面形貌及其元素化学状态的变化，用傅里叶变换红外光谱仪分析了橡胶表面官能团的变化。结果表明：丁腈橡胶在应力集中处发生分子链断裂，形成高活性大分子自由基，大分子自由基与活化的金属发生力化学反应，生成金属－聚合物膜；同时，矿物油在金属表面还产生物理吸附和化学吸附膜。其与金属－聚合物膜在剪切力或磨屑

Study on Mechanisms of Wear of Metal by Nitrile Rubber under Boundary Lubrication Condition

The wear mechanisms of metal by nitrile rubber under boundary lubrication condition were investigated.The morphology of wear track and chemical state of elements in worn metal and rubber surfaces were examined by SEM and XPS.The function groups in rubber were analyzed with FT IR.It was found that the rubber molecular chain was broken at the site of stress concentrations.The broken molecular chain generated active macromolecular free radicals that reacted with the activated iron atoms and generated metal polymer film on the metal surface.Meanwhile,the mineral oil formed physical and chemical absorption film.The boundary lubricating films on metal surface were destroyed by repeating shear stress and the debris on the sliding surface.The removal of the boundary lubricating film contributed to the wear of metal by rubber.