纳米铜润滑油添加剂的制备及其摩擦学性能

Preparation of Nanoscale Copper Lubricant Additive and Evaluation of Its Tribological Properties

为了研究纳米铜粉的制备与其摩擦学性能,利用高能球磨机采用干湿磨相结合的方法制备了纳米铜粉,再将其加入500SN齿轮油中制成润滑油添加剂,用透射电镜(TEM)及万能磨擦磨损试验机研究了纳米铜粉的微观形貌及其润滑油添加剂的摩擦学性能。结果表明:纳米铜粉粒径为10～40 nm,在修饰剂中分散较好,颗粒表面有明显包覆层;纳米铜润滑油添加剂可提高基础油的减摩抗磨性能;纳米铜粉含量0.05%的纳米铜润滑油样的摩擦学性能最好且摩擦系数最低;低载荷下纳米铜润滑油样的摩擦学性能优于高载荷下的。

A high energy ball miller was performed to prepare nanoscale Cu powder via alternate dry grinding and wet grinding,and as-obtained nanoscale Cu powder was added into 500SN oil to form nanoscale Cu lubricating oil additive.The microstructure of as-obtained nanoscale Cu powder was observed with a transmission electron microscope.A universal friction and wear tester was performed to evaluate the tribological properties of as-obtained nanoscale Cu lubricating oil additive.Results showed that as-prepared nanoscale Cu powder had a diameter of 10~40 nm and contained a surface-modified layer,while it possessed good dispersibility in lubricating base oil.In the meantime,as-prepared nanoscale Cu lubricating oil additive was able to improve the tribological properties of the base stock.Namely,the base stock containing 0.05%(mass fraction) nanoscale Cu had the best tribological properties.Moreover,the base stock containing nanoscale Cu showed better tribological properties under low load than under high load.