The Complex of Pentaerythritol Ester Base Oil by Calcium Perrhenate and Its Anti-friction Performance in Wide Temperature Range

In the present paper,the optimum matching of surfactant additive and calcium perrhenate concentration in pentaerythritol ester base oil for long time stability was selected. The anti-friction performance of this complex oil was investigated by using a ball-on-disc (Si₃N₄ /GH128 super-alloy) rubbing tribo-meter from room temperature to 600 ℃. The results show that the surfactant additive composite of OP-10 and SDS was stable after storage over 90 days. The complex oil containing 0.5%~1.0% calcium perrhenate presented good anti-friction effect in a wide temperature range with friction coefficient about 0.15~0.25. The possibility about a hybrid lubrication mode,i.e. smooth transition from oil film to solid lubrication at elevated temperature,is discussed.