Abstract Understanding the ability of fully formulated industrial oils to protect the contacting surfaces requires techniques revealing the effect of tribofilm growth on the EHL film. This was achieved by employing sliding/rolling smooth contact in a ball-on-disc test for two industrial EAL gear oils and two industrial mineral oils. Friction and electrical contact resistance (ECR) of three stribeck stages at different running-in periods were studied besides measuring the tribofilm thickness evolutions by Spacer Layer Interferometry Method (SLIM). In the end, a wear test was performed and wear scars were measured. Results showed that lower pressure-viscosity coefficient of EALs does not necessarily lead to high metal-metal contact, and their thin tribofilm serves to keep the friction low in mixed and boundary regimes.

中文翻译：

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全配方环保齿轮油的 EHL/混合过渡

摘要 了解全配方工业油保护接触表面的能力需要揭示摩擦膜生长对 EHL 膜的影响的技术。这是通过在两种工业 EAL 齿轮油和两种工业矿物油的球盘测试中采用滑动/滚动平滑接触来实现的。除了通过间隔层干涉法（SLIM）测量摩擦膜厚度演变外，还研究了不同磨合期的三个斯特里贝克阶段的摩擦和接触电阻（ECR）。最后，进行了磨损测试并测量了磨损疤痕。结果表明，EAL 的较低压力粘度系数并不一定会导致高金属 - 金属接触，并且它们的薄摩擦膜用于在混合和边界区域保持低摩擦。