油溶性氟化镧纳米棒的制备及其摩擦学性能研究

Study on Preparation of Oil-soluble LaF_3 Nanorods and its Tribological Properties

利用超声波辅助处理,在乙醇-水体系中,以二辛基二硫代磷酸双(β-)羟乙基十八胺盐为表面修饰剂制备了表面修饰氟化镧纳米棒,通过相转移法制得油溶性纳米氟化镧添加剂。通过X射线衍射仪(XRD)、透射电镜(TEM)及热重仪(TG)表征了表面修饰氟化镧纳米棒的结构及形貌,利用离心沉降法和升温法结合研究了添加剂中纳米氟化镧在500SN基础油中的分散稳定性和高温稳定性,利用四球机考察了纳米氟化镧的摩擦学性能,并通过SEM和AES分析了钢球磨斑表面。结果表明:氟化镧纳米棒直径在4～7nm之间,长度为20～30nm;氟化镧纳米棒在500SN基础油中具有良好的分散稳定性,并可使基础油的最大无卡咬负荷值增加了109.61%,磨斑直径降低39.13%;AES结果表明,氟化镧沉积在磨斑表面形成一层复合膜,并且渗透入磨斑的亚表面,共同提高基础油的摩擦学性能。

Surface modified LaF3 nanorods were prepared in a mixture solution of water-ethanol with dioctyl dithiophosphoric acid di(β-ethoxyl)stearamine as a surface modifier by an ultrasonic method.Oil-soluble nano-LaF3 additives were obtained by a phase transfer method.Morphology and surface modification of LaF3 nanorods were investigated by XRD,TEM and TG.Dispersing stability and high temperature stability of LaF3 nanorods in 500SN base oil were measured respectively by a centrifugal setting method and a temperatu...