ISSN   1004-0595

CN  62-1224/O4

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油酸修饰纳米氟化钙的萃取法制备及其摩擦学性能

Preparation and Tribological Properties of CaF2 Nanocluster Capped with oleic Acid as Lithium Grease Additive

  • 摘要: 采用萃取法制备了油酸修饰的纳米CaF2 ,用X 射线衍射(XRD )对纳米CaF2 粉体样品进行物相分析,同时用透射电子显微镜(TEM )及傅立叶变换红外光谱仪(FT-IR )进行表面形貌和成分分析,并在四球摩擦磨损试验机上评价了CaF2 :在润滑脂中的摩擦学性能结果表明,制备的纳米CaF2 :粒径在23 nm 左右,油酸以化学吸附的方式吸附在CaF2 纳米核表面;作为添加剂油酸修饰纳米CaF2 在润滑脂中具有良好的抗磨胜能和极压性能,在高载荷时具有良好的减摩性能SEM , EDS 和XPS 分析表明在摩擦过程中形成了由CaF2 ?CaO ?氧化铁和有机添加剂所组成的边界润滑膜,从而使OA -CaF2 :具有良好的摩擦学性能

     

    Abstract: An oleic acid surface -modified calcium fluoride ( CaF2 : ) nanoparticle ( OA -CaF2 : ) with average diameter of 23 nm was chemically synthesized using an extraction method The morphologies and crystalline structures of the powder have been characterized by transmission electron microscopy ( TEM ) and X–ray di ffraction ( XRD ) , while the chemical composition and further information on the structure of the nanoparticles have been characterized by FT -IR The results showed that surface of CaF2 nanoparticles had been modified by oleic acid successfully The tribological properties of the prepared OA -CaF2 nanoparticles as an additive in lithium grease were evaluated on a four -ball tester The results indicated that nanoparticles exhibited excellent anti -wear and extreme pressure ( EP ) properties It 15 also found that OA -CaF2 : nanoparticles had good friction -reducing ability at high loads SEM , EDS and XPS analyses indicated that a boundary film mainly composed of CaF2 , CaO , Fe oxide and some adsorbed organic compounds was formed during the friction process These contributed to the good friction -reducing and good antiwear ability of OA -CaF2 nanoparticles as lithium grease additive

     

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