钛基脂皂分子结构对其摩擦学性能的影响

Effect of Soap Molecular Structure of Titanium Complex Grease on Its Tribological Properties

采用实验室制脂釜制备出苯甲酸和癸二酸组分钛基脂,考察钛基脂的摩擦磨损性能及承载能力,分析皂分子结构和钛基脂摩擦学性能的关系。利用扫描电子显微镜(SEM)观察钢球的磨斑表面形貌,并用X射线光电子能谱(XPS)分析钢球磨斑表面元素含量,利用红外光谱分析表征钛基脂皂分子结构。结果表明:钛基脂摩擦学性能主要取决于钛基脂皂分子结构;含苯环结构苯甲酸组分钛基脂的抗磨特性优于癸二酸组分钛基脂,而他们的减摩特性和极压性能相同;2种钛基脂润滑下钢球主要的摩擦特征为黏着磨损。含苯环结构的苯甲酸组分钛基脂具有较好抗磨性能主要原因为在摩擦表面上生成了较厚含钛元素的化学沉积膜。

Benzonic acid sebacic acid titanium complex grease were prepared with experimental kettle,and its friction and wear performance,load-carrying capacity were studied. Relation between soap molecular structure and tribological properties of titanium complex grease were analyzed. Morphology of wear scar of steel balls were observed using SEM.Chemical states of typical elements on the wear scar of steel ball were analyzed by means of the XPS. Soap molecular structures of titanium complex grease were characterized using infrared spectrum. The results show that tribological performance of titanium complex grease mainly depends on the molecular structure of titanium complex soap. Antiwear properties of benzonic acid titanium complex grease containing benzene ring are better than that of sebacic acid titanium complex grease,but their anti-friction and load-carrying capacity are the same. The main wear mechanism of steel ball under lubrication of titanium complex greases is adhesive wear. The reason that benzonic acid titanium complex grease containing benzene ring has good antiwear properties is that the thicker chemical sediment containing titanium is formed on the tribological surface.