界面闪温对ZDDP反应膜生成特性的研究

二烷基二硫代磷酸锌(ZDDP)作为最常见的发动机润滑油添加剂，通常认为ZDDP摩擦膜在较高的宏观环境温度下产生，而忽视了局部区域的闪温变化对于膜生长的影响. 本文作者结合应力促进的热活化理论和润滑界面闪温计算模型，以球-盘滑滚摩擦试验研究为主，进行了界面闪温对ZDDP摩擦膜生成特性的分析. 在载荷和环境温度恒定的条件下，计算了不同界面滑滚比的闪温大小与分布，采用球-盘试验测得了常温下不同滑滚比的ZDDP润滑剂摩擦系数变化趋势，并与计算得到的闪温模型对照，得到闪温对ZDDP反应膜生长的影响规律；为了改善ZDDP薄膜导致的高摩擦，测试了硬脂酸钙与ZDDP的协同减摩效果. 结果表明:界面闪温的升高同样可以促进一定厚度的ZDDP摩擦膜生长；硬脂酸钙润滑剂与ZDDP共同生成的边界膜可以有效地降低ZDDP带来的高摩擦力，可以用于改善ZDDP摩擦膜的摩擦性能. 

Effect of Flash Temperature on the Formation of ZDDP Reaction Film

As the most common additive of engine lubricating oil, zinc Dialkyldithiopho- sphate (ZDDP) has not yet found a suitable substitute. It is generally considered that ZDDP film is produced at a higher macro environment temperature, while the influence of local flash temperature change on the growth of ZDDP friction film is ignored. Based on the thermal activation theory of stress promotion and the calculation model of lubrication interface flash temperature, this paper focused on the ball-disk slip-rolling friction experimental research, and conducted the analysis of interface flash temperature on the ZDDP friction film formation characteristics. The flash temperature and its distribution under different interface slip roll ratios were calculated under the condition of constant load and ambient temperature. At room temperature the variation of friction coefficient of ZDDP lubricant with different slip roll ratios was measured by ball-on-disk experiment at room temperature, and compared with thecalculated flash temperature model, the effect of flash temperature on the growth of ZDDP reaction film can be obtained. In order to improve the high friction caused by ZDDP film, the synergistic effect of calcium stearate and ZDDP was tested. The results showed that the increase of interfacial flash temperature can also produce ZDDP friction film of a certain thickness. The synergistic friction reduction experiments of calcium stearate lubricant and ZDDP showed that calcium stearate lubricant improved the friction performance of ZDDP friction film, and the boundary film formed by calcium stearate lubricant and ZDDP effectively reduced the high friction caused by ZDDP.