油酸修饰纳米氟化镧的摩擦学性能

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The surface modification lanthanum fluoride nanoparticle was prepared with oleic acid as modifier, and its tri- bological properties in the base oil of 150N were studied in the ring-lock friction and wear tester. The surface morphology and elemental composition of the wearing specimens were observed and analyzed respectively by transmission electron mi- croscopy （TEM）, optical microscope and X-ray diffraction （XRD）. The anti-wear and friction reducing mechanism was dis- cussed. The results show that in the steady wear stage when lubricated by the base oil of 150N containing 2% lanthanum fluoride nanoparticles,the friction coefficient of the samples is reduced by 40% ,and the total weight loss is decreased by 43.75% compared with lubricated by the pure base oil of 150N under the conditions of 250 N pressure and 450 r/min speed. EDX analysis shows that the self-repairing film is generated in the worn surface of the samples by lanthanum fluor- ide nanoparticles during the friction.以油酸为修饰剂制备表面改性的氟化镧纳米粒子，在环块式摩擦磨损试验机上考察氟化镧纳米粒子在150N基础油中的摩擦学性能，借助透射电镜（TEM）、金相显微镜及X射线衍射仪（XRD），分别对磨损试样的表面形貌和元素成分进行观察和分析，探讨表面修饰氟化镧纳米添加剂的抗磨减摩机制。结果表明：油酸修饰的氟化镧纳米粒子在150N基础油中减摩抗磨效果明显，与纯基础油润滑相比，在250N压力和450r／min转速条件下，质量分数2％的氟化镧纳米粒子在稳定磨损阶段可使45#钢试样摩擦因数降低40％，总失重降低43．75％。EDX分析表明，氟化镧纳米粒子在摩擦过程中在磨损表面生成了自修复膜。