镧掺杂白云母复合粉体的制备及其作为锂基润滑脂添加剂的摩擦学性能

采用机械固相化学反应法制备了镧掺杂白云母（MC）的复合粉体，对复合粉体进行了油酸改性，简记为La-MC。采用SEM,XRD,EDS和FTIR表征了粉体的微观结构。利用四球摩擦磨损试验机考察了MC和La-MC作为锂基润滑脂添加剂的摩擦学性能。结果表明复合粉体中纳米La(OH)3包覆在白云母粉体表面。La-MC和MC作为添加剂均能有效提高锂基润滑脂的减摩抗磨性能，且La-MC复合粉体的摩擦学性能优于MC单体。La-MC优良的摩擦学性能与其磨损表面生成的物理吸附膜和主要成分为Fe2O3 和 SiO2的化学反应膜有关，而镧在摩擦过程中可能主要起催化作用。

Prepartion and Tribological Properties of Lanthanum-doped Muscovite Composite Particles as Lubricant Additives in Lithium Grease

Lanthanum-doped muscovite (MC) composite particles were prepared by mechanical solid-state-chemistry-reaction method followed by surface modification with oleic acid, abbreviated La-MC. The microstructure of materials was characterized by SEM, XRD, EDS and FTIR. Furthermore, the friction-reduction and anti-wear properties of MC and La-MC as lubricant additives in lithium grease were evaluated using a four-ball friction and wear tester. The results show that La(OH)3 nanoparticles are coated on the surface of muscovite. Both MC and La-MC can effectively improve the friction-reduction and anti-wear properties of lithium grease and La-MC presents better tribological properties than MC. The excellent tribological properties of La-MC can be attributed to the formation of the adsorption film of La-MC and the chemical reaction film mainly consisting of Fe2O3 and SiO2 on the worn surface, as well as the catalysis of lanthanum element during the friction process.