Study on the mechanism of rapid formation ofu ultra-thick tribofilm by CeO_(2)nano additive and ZDDP  

作　　者：Xue LEI Yujuan ZHANG Shengmao ZHANG Guangbin YANG Chunli ZHANG Pingyu ZHANG 

机构地区：[1]National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials,Henan University,Kaifeng 475004,China

出　　处：《Friction》2023年第1期48-63,共16页摩擦（英文版）

基　　金：We acknowledge the financial support provided by the National Natural Science Foundation of China(Nos.51875172 and 51775168);Scientific and Technological Innovation Team of Henan Province Universities(No.19IRTSTHN024);Zhongyuan Science and Technology Innovation Leadership Program(No.214200510024).

摘　　要：CeO_(2)nanoparticles are potential anti-wear additives because of their outstanding anti-wear and load-bearing capacity.However,the shear-sintering tribo-film formation mechanism of oxide nanoparticles limits the tribo-film formation rate and thickness greatly.In this study,by compounding with zinc dioctyl dithiophosphate(ZDDP),ultra-fine CeO_(2)nanoparticles modified with oleylamine(OM)can quickly form 2μm ultra-thick tribo-film,which is 10-15 times thicker than that of ZDDP and CeO_(2),respectively.The ultra-thick tribo-film presents a nanocomposite structure with amorphous phosphate as binder and nano-CeO_(2)as filling phase,which leads to the highest loading capacity of composite additives.The results of adsorption experiments tested by dissipative quartz crystal microbalance(QCM-D)showed that the Ps value of additive has nothing to do with its equilibrium adsorption mass,but is directly proportional to its adsorption rate in 10 s.The compound additive of CeO_(2)and ZDDP presented the co-deposition mode of ZDDP monolayer rigid adsorption and CeO_(2)viscoelastic adsorption on the metal surface,which showed the highest adsorption rate in 10 s.It is found that the tribo-film must have high film forming rate and wear resistance at the same time in order to achieve super thickness.Cerium phosphate was formed from ZDDP and CeO,through tribochemistry reaction,which promotes the formation of an ultra-thick tribo-film with nanocomposite structure,which not only maintains the low friction characteristics of CeO,but also realizes high Pg and high load-carrying capacity.

关 键 词：CeO_(2)nanoadditives adsorption nanocomposite ultra-thick tribofilm zinc dioctyl dithiophosphate(7DDP) 

分 类 号：TG174.4[金属学及工艺—金属表面处理]