生物质燃油摩擦磨损特性试验分析

采用四球摩擦磨损试验等方法,研究了热解液化方法制备的生物质燃油的摩擦学特性.借助SEM,XPS,GC-MS,TGA等分析测试技术考察了摩擦磨损实验后的摩擦副磨痕表面形貌,磨痕表面元素的化学结合状态,摩擦磨损实验前后生物质燃油的主要化学成分的变化及其热化学物理特性.结果表明:生物质燃油的最大无卡咬负荷(PB值)为392 N,在196N和294N压力,生物质燃油的平均摩擦系数为0.083和0.097,磨痕表面呈带状犁沟:磨痕表面出现了含-OH、-COOH基闭的有机物和FeS、FeSO4的能谱吸收峰;摩擦磨损实验后生物质燃油的醛酸类物质含量明显变化.生物质燃油的摩擦磨损机理归因于在摩擦表面形成了含FeS、FeSO4等的化学反应膜以及含有-OH、-COOH等极性基团的有机物的吸附油膜的存在,使钢球摩擦副之间保持了良好的边界润滑.

Experimental study on friction and wear characteristics of bio-oil

The tribological performance of the bio-oil was evaluated by MQ-800 four-ball tribometer. The surface analytical tool SEM and XPS were used to investigate the morphology and distribution of active elements on rubbed surface on steel balls. The variation of chemical compositions and thermal property of bio-oil before and after friction were studied by GC-MS and TGA, respectively. The experimental results showed that the extreme pressure of the bio-oil was up to 392 N. The frictional coefficient of bio-oil varies between 0.083 and 0.097 with the 196 N and 294 N pressure. There were many belt-like ploughs on the rubbed ball surface, and the binding energy peaks such as the organic with hydroxyl group or carboxyl group, inorganic including FeS and FeSO4 were also investigated. The contents of the aldehyde and acid varied after friction experiments. It was shown that the film composed of FeS, FeSO4 and organic compounds with -OH and -COOH groups on the rubbing surface was ascribed to the good lubricate performances of bio-oil.