The effect of TiO2 phase on the lubricating performance of sol–gel-derived TiO2 nanoparticles in fully formulated engine oil
The effect of TiO2 phase on the lubricating performance of sol–gel-derived TiO2 nanoparticles in fully formulated engine oil
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DOI：
10.1007/s10971-020-05354-4
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发表时间：
2020-07
影响因子：
2.5
通讯作者：
L. Cao;Yang Li;Y. Wan;C. Qi
中科院分区：
文献类型：
--
作者：
L. Cao;Yang Li;Y. Wan;C. Qi
This paper is devoted to investigate the friction-reducing and wear protection performance of TiO2nanoparticles as lubricant additive in fully formulated engine oil. The phase of TiO2nanoparticles, synthesized by a sol–gel process, was characterized by XRD. A four-ball tribometer was used to compare the friction coefficient and wear when lubricated by engine oil in absence and presence of TiO2nanoparticles. The surface chemistry of tribofilm was observed by XPS. The experiments showed that phase of TiO2nanoparticles plays great role in determining the friction-reducing and wear protection of engine oil containing TiO2nanoparticles. TiO2nanoparticles upon calcination at 300 °C are amorphous, showing lowest hardness and then best friction-reducing and wear protection performance in engine oil. Rutile nanoparticles obtained upon calcination at the temperature above 700 °C, on the contrary, act as abrasive in the sliding contact and present larger wear than the blank engine oil.Amorphous TiO2nanoparticles calcinated at 300 °C presents lowest average coefficient of friction and wear scar diameter in engine oil.
