表面修饰硼酸盐润滑油添加剂的摩擦学性能

An Investigation of the Tribological Performances of the Modified Borate as Oil Additive

制备了表面修饰的硼酸盐润滑油添加剂（球形颗粒，粒径大都小于０．５μｍ），且用四球试验机研究了其摩擦学性能．结果表明：这种添加剂具有良好的极压抗磨减摩性能，当润滑油中元素Ｂ的质量分数为０．０５％时，四球磨斑直径最小，最大无卡咬负荷（ｐＢ值）最高；基础油的粘度和含水量对添加剂的极压抗磨性能有较大的影响，粘度为６５．３０ｍｍ２／ｓ时的极压抗磨性最好，水的质量分数为１％时的ｐＢ值最高，低于１％时的ｐＢ值比不含水时的高，水的质量分数高于１％时的ｐＢ值随水含量的增加而降低．Ｘ射线光电子能谱分析发现，表面修饰的硼酸盐润滑油添加剂在摩擦表面形成了一层混合的摩擦化学反应膜，其中元素Ｂ主要以ＢＮ的形式存在．

A particle size less than 0.5 μm modified borate were synthesized. The tribological properties of the modified borate as an oil additive have been studied by four ball tester. The results show that the modified borate additive possesses good extreme pressure(EP), antiwear(AW) and friction reduction properties. When the content of element B is 0.05%, wear scar diameter is the smallest, p B value is the highest. The results also show that the viscosity of base oil and the amount of water in oil borate have great effect on the tribological properties of the modified borate additive. The AW and EP properties of the modified borate additive is the best in the oil nith viscosity of 65.30 mm 2/s and water content of 1.0%. A small area X ray photoelectron spectroscopy(XPS) analyses indicated that the modified borate additive form a tribological mixed reaction film on rubbed surface. Element B mainly exists in the forms of BN on the rubbed surface. The content of element N is higher than that of element Na.