CeO₂ 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 CeO₂ nanoparticles modified with oleylamine (OM) can quickly form 2 µm ultra-thick tribo-film, which is 10–15 times thicker than that of ZDDP and CeO₂, respectively. The ultra-thick tribo-film presents a nanocomposite structure with amorphous phosphate as binder and nano-CeO₂ 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 P_B 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 CeO₂ and ZDDP presented the co-deposition mode of ZDDP monolayer rigid adsorption and CeO₂ 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 CeO₂ 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 CeO₂, but also realizes high P_B and high load-carrying capacity.

CeO ₂纳米颗粒因其出色的抗磨和承载能力而成为潜在的抗磨添加剂。然而，氧化物纳米颗粒的剪切-烧结摩擦膜形成机制极大地限制了摩擦膜的形成速率和厚度。本研究通过与二辛基二硫代磷酸锌（ZDDP）复合，用油胺（OM）修饰的超细CeO2纳米颗粒可快速形成₂ µm超厚摩擦膜，其厚度是ZDDP的10-15倍， CeO ₂，​​分别。超厚摩擦膜呈现以非晶磷酸盐为粘合剂和纳米CeO _{2的纳米复合结构}作为填充阶段，这导致复合添加剂的最高负载能力。耗散石英晶体微量天平（QCM-D）吸附实验结果表明，添加剂的P _B值与其平衡吸附质量无关，与其10 s内的吸附速率成正比。_{CeO 2}与ZDDP的复合添加剂在金属表面呈现ZDDP单层刚性吸附和CeO ₂粘弹性吸附的共沉积模式，在10 s内表现出最高的吸附速率。发现摩擦膜必须同时具有高成膜率和耐磨性才能实现超厚。磷酸铈由 ZDDP 和 CeO _2形成通过摩擦化学反应，促进纳米复合结构的超厚摩擦膜的形成，既保持了CeO ₂的低摩擦特性，又实现了高P _B和高承载能力。