We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Study on the mechanism of rapid formation of ultra-thick tribofilm by CeO<sub>2</sub> nano additive and ZDDP.
- Authors
Lei, Xue; Zhang, Yujuan; Zhang, Shengmao; Yang, Guangbin; Zhang, Chunli; Zhang, Pingyu
- Abstract
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 PB 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 PB and high load-carrying capacity.
- Subjects
CERIUM oxides; QUARTZ crystal microbalances; FOOD additives; WEAR resistance; METALLIC surfaces; MECHANICAL wear
- Publication
Friction (2223-7704), 2023, Vol 11, Issue 1, p48
- ISSN
2223-7704
- Publication type
Article
- DOI
10.1007/s40544-021-0571-8