润滑油添加剂对齿轮微点蚀的影响研究

EFFECT OF LUBRICANT ADDITIVES ON GEAR MICRO-PITTING

探索建立微牵引力测定仪(MTM)、聚离子束、扫描电子显微镜、透射电子显微镜和能量色散光谱相结合的方法对齿轮微点蚀进行识别和评价。研究发现:添加剂的减摩性能和抗磨性能是影响其抗微点蚀性能的关键因素,在MTM试验中存在一个摩擦轨迹宽度不大于400μm、摩擦因数不小于0.097的微点蚀易产生区域,添加剂和配方的研发应避开这个微点蚀易产生区域,综合平衡减摩性和抗磨性;添加剂所形成的耐机械剪切的摩擦膜抗磨性能越好,使得MTM试验中的摩擦轨迹更窄,应力更集中,更易产生微点蚀;在产生微点蚀的润滑体系中引入降低体系摩擦因数的添加剂可改善其抗微点蚀性能。

A new method was developed to identify and evaluate the micro-pitting corrosion of gears by mini-traction machine(MTM),focused ion beam(FIB),scanning electron microscope(SEM),transmission electron microscope(TEM)and energy dispersive spectrometer(EDS).It was found that friction-reduction and anti-wear properties of additives were the key factors affecting micro-pitting resistance.In the MTM test,there was an area where micro-pitting was easy to occur with friction track width of no greater than 400μm and friction coefficient of no less than 0.097.The development of additives and formulations should avoid this area and comprehensively balance friction-reduction and anti-wear properties.The better the anti-wear property of the friction film formed by the additive,the narrower the friction track of MTM,the more concentrated the stress,and the easier to produce the micro-pitting corrosion in the MTM test.The anti-micro-pitting performance can be improved by adding additives which can reduce the friction coefficient of the system.