稀土化合物对含烟炱油品抗磨性能影响

为探索减轻烟炱磨损的途径,用自制烟炱捕集装置收集了精制生物质油和柴油的微乳化燃油烟炱(Bio-fuel soot,BS),在四球机上考察纳微米级的稀土化合物对含BS的液体石蜡(Liquid paraffin,LP)抗磨性能的影响,借助EDS分析磨斑元素组成。结果表明,微米Ce2O3可减轻烟炱磨损,但是效果不明显。微米La2O3可以提高纯LP的抗磨能力,但不能够降低含烟炱LP的磨损,表面修饰的Nano-LaF3抗烟炱磨损效果明显,烟炱浓度2. 0%时其最优添加浓度为0.6%,有望作为解决烟炱磨损的润滑油添加剂。Nano-LaF3对含烟炱的LP的抗磨性能的影响机理在于摩擦过程中形成含铁氧化物、碳氧化物及含镧化合物的边界润滑膜。

Effects of Rare-earth Compounds on the Anti-wear Property of Lubricating Oil Contained Soot

In order to explore a pathway for alleviating soot abrasion,bio-fuel soot( BS) was collected in a homemade soot trapping equipment via a combustion process of the bio-fuel prepared by the emulsified and refined biomass oil and diesel.A four-ball tribological test was done to investigate the effects of rare-earth compounds with nano/micro-sized particles on the anti-wear performance of liquid paraffin( LP) contained BS. The elements composition of the worn surfaces was investigated by energy-dispersive spectroscopy( EDS).Results showed that micro-sized Ce2O3 can slightly alleviate soot abrasion,but its effect is unobvious. Micrometer La2O3 can improve the anti-wear property of LP,but it cannot reduce soot abrasion. The surface modified nano-LaF3 can significantly contribute to the enhancement of the anti-wear property of LP with BS. The optimum content of nano-LaF3 is 0.6% in the LP with 2.0% BS. Nano-LaF3 is the hopeful additive which can solve soot abrasion in lubricating oil. The possible mechanism is ascribed to the formation of a boundary lubrication film on the friction surface,including iron oxides,carbon oxides and lanthanum compound.