在干摩擦和边界润滑条件下丁苯橡胶对20^#钢的磨损机理研究

MECHANISM OF WEAR OF 20~# STEEL BY STYRENE-BUTADIENE RUBBER UNDER THE CONDITIONS OF DRY FRICTION AND BOUNDARY LUBRICATION

用扫描电子显微镜 (SEM)和X射线光电子能谱仪 (XPS)分析了磨损表面的形貌、元素含量及金属表面元素化学状态的变化 ,用镜面全反射傅立叶红外光谱仪 (FT IR)分析了橡胶表面官能团的变化。结果表明 ,2 0 # 钢被磨损的物理过程为磨粒磨损 (微切削 )。 2 0 # 钢被磨损的化学机制包括 :①金属及其氧化物与丁苯橡胶大分子自由基的反应 ;金属与具有含氧基团的丁苯橡胶分子链间的反应 ;②金属与矿物油烷烃链间及金属与氧化的矿物油烷烃链间的反应 ,主要反应产物为含有Fe C的金属聚合物及含有Fe O的聚合物 ;③金属本身的氧化 ,主要反应产物为Fe2 O3 ,FeO和Fe3 O4。

The mechanism of wear of metal by styrene butadiene rubber (SBR) under the conditions of dry friction and boundary lubrication was investigated taking 20\+# steel as a sample. The morphology of wearing track as well as the content and chemical state of elements on weared surfaces of metal were analyzed by SEM and XPS respectively. The function groups on SBR surface were analyzed with FT IR. The physical wearing process of 20\+# steel by SBR is mainly resulted from the abrasion wear. The chemical mechanism of wear for 20\+# steel by SBR is the mechanochemical reaction produced among 20\+# steel, SBR and mineral oil, as well as the oxidation on the surface of 20\+# steel. In the dry friction, the iron atom and metal oxide are reacted with the macroradicals of SBR, and the iron atom reacted with the oxidized macromolecular chains of SBR, as well as the alkane chains and the oxidized alkane chains of mineral oil. The main products include metal polymer compound and metal oxide polymer complex. In the boundary lubrication case, the main oxides on the surface of 20\+# steel include Fe 2O 3,FeO and Fe 3O 4.