石墨和层状二硅酸钠的复配体系作为润滑脂添加剂的摩擦学性能

The Tribological Properties of the Combined System of Graphite and Crystalline Layered Sodium Disilicate as the Additives in Lithium Greases

采用X射线衍射、红外光谱、激光粒度仪等对石墨和改性层状二硅酸钠粉体进行表征,应用均匀设计法设计石墨和层状二硅酸钠润滑脂添加剂复配体系,采用四球摩擦磨损机考察复配体系的摩擦学性能,应用分析软件对数据进行回归分析。结果表明:复配体系能够在一定程度上改善基础脂的抗磨减摩性能,在高负荷下效果尤其显著。在摩擦力作用下,复配体系和钢球表面作用形成了抗磨减摩性能良好的膜层;同时,二硅酸钠和石墨的层状结构在摩擦副相对滑动过程中易定向排列,变摩擦副之间的运动为添加剂内部的层间滑移,减小了摩擦阻力。拟合的回归方程能够较好地反映复配组合添加量和摩擦磨损的关系,计算结果与实验结果具有较好的一致性。

The powders of graphite and crystalline layered sodium disilicate were characterized by XRD, FF-IT and laser granularity analyzer. The combined system of graphite powder and crystalline layered sodium disilicate powder was designed by the uniform design method, and its antiwear and friction reducing properties were studied by four-ball tester. The regres- sion analysis was made on the experimental data by analysis software. The results show that the combined system of graph- ite and crystalline layered sodium disilicate can improve the antiwear and friction reducing properties of base grease, espe- cially under high loading. The film with good antiwear and friction reducing performance is formed on the steel ball surface by the combined system due to the friction force. The alignment is easy to form during the sliding process of friction pairs due to the layered structure of sodium disilicate and graphite,the movement of friction pairs is transformed to the internal sliding of additives, and the friction resistant is reduced. The regression equation can well show the relationship of the addition of graphite and crystalline layered sodium disilicate on the combined system and the friction coefficients and wear scar diameters. The calculation results and experimental results have good consistency.