【摘要】 采用发动机活塞环-缸套摩擦磨损试验台,研究了微乳化生物质燃油在活塞环-缸套摩擦副往复运动过程中的摩擦磨损特性.借助扫描电子显微镜及附带的能谱、X射线光电子能谱仪等分析测试手段考察了磨痕表面形貌及元素组成与含量、主要元素化学状态,探讨了摩擦磨损机理.结果表明,在微乳化生物质燃油润滑条件下,活塞环-缸套之间的摩擦系数和它们的磨损量均随着往复运动频率增加而增大,微乳化生物质燃油减摩性较0#柴油好,耐磨性比0#柴油差;摩擦磨损的机理归于微乳化生物质燃油中的极性基团如羧基(—COOH)易于吸附在摩擦副表面起到边界润滑作用,而乳化燃油中酸性物质在摩擦过程中加大了对摩擦表面的腐蚀,同时摩擦表面形成的Fe2O3氧化膜在摩擦力作用下脱落并充当磨粒,从而使磨损加剧.更多还原

【Abstract】 The friction and wear behaviors of different oils( micro-emulsified bio-oil and diesel fuel) under reciprocating sliding condition by a tribometer of piston ring-cylinder liner were investigated. The morphology of worn surface and the content of elements on worn surface were analyzed by scanning electron microscopy and energy dispersive spectroscopy. The chemical states of several typical elements on the worn surface were examined by means of X-ray photoelectron spectroscopy. The mechanisms of friction and wear was explored. The results show that the friction coefficient and wear of piston ring and cylinder liner increased with the reciprocating frequency under lubrication of micro-emulsified bio-oil.The friction reduction of micro-emulsified bio-oil was better than that of diesel fuel while wear resistance of piston ring and cylinder liner in micro-emulsified bio-oil was worse than that in diesel fuel. The mechanism of friction and wear was attributed to polar group in the micro-emulsified bio-oil which easily adsorbed on the rubbing surface and led to better lubrication. However,the corrosion role on the rubbing surface was enhanced and intensified the debris abrasion. Fe2O3acted as abrasive particle and increased the wear.更多还原