【摘要】 在 SRV微动磨损试验机上 ,采用阶梯升温方式研究了全配方汽油发动机油 SJ/CF/5 W- 30对几种不同摩擦副的润滑作用 ,并采用激光拉曼分子光谱仪分析了润滑油的摩擦炭化行为 .结果表明 :在连续升温的摩擦磨损过程中 ,摩擦系数曲线出现明显波谷 ,且波谷现象随摩擦副材料类型的不同而不同 ,其中钼合金喷涂层 /铸铁摩擦副的波谷现象最为显著 .通过对润滑油摩擦炭化物进行激光拉曼光谱分析发现 ,其 G线峰位、峰宽以及石墨微晶尺寸 (L a)均同摩擦副材料类型相关 ;炭化物石墨微晶尺寸 (L a)同波谷处摩擦系数亦存在对应关系 ,其中钼合金喷涂层 -铸铁摩擦副对应的润滑油摩擦炭化产物的石墨微晶尺寸最大 ,相应的波谷处摩擦系数最低更多还原

【Abstract】 The tribocarbonization behavior of a fully formulated engine oil SJ/CF/5W 30 was investigated on an SRV tribotester with respect to the frictional pairs of Mo sprayed coating/cast iron, nitrided coating/cast iron, and Cr plated coating/cast iron, under stepwise heating condition. The tribocarbonized product of the engine oil was characterized by means of laser Raman spectroscopy, and the correlation between the characteristics of the degraded products and the tribological behavior of the frictional pairs was explored accordingly. It was demonstrated that the different frictional pair showed different changing tendency of friction coefficient with increasing testing temperature. A minimal friction coefficient, however, was recorded for each frictional pair in the temperature range of 300 370 ℃, though it was different for each frictional pair. Raman spectroscopic examination of the worn cast iron surfaces indicated that carbonaceous substances were derived from the degradation and carbonization of the engine oil, which were composed of both disordered and ordered carbonaceous species whose ratios depended on the test temperature. The positions and widths of the G lines on the Raman spectra of the degraded products of the engine oil, and the calculated graphite crystallite sizes ( La ) of the degraded products were also different for each frictional pair. It was thus supposed that there existed some kind of relevance between the La value and the minimum friction coefficient for each frictional pair. Namely, Mo sprayed coating/cast iron pair giving the lowest friction coefficient recorded the maximal La value of the carbonaceous species of the oil degraded product as well.更多还原