Abstract
This study investigates the extreme pressure performance of phosphorus-based additives mixed with polyalkylene glycol (PAG) oil lubricant via a four-ball test, using an AISI 52100 hardened steel and a ceramics (ZrO2) ball, separately. According to the experimental results, PAG oil lubricant has a good tribological performance for small loads at room temperature. However, when the load or temperature was raised, the extreme pressure performance and anti-wear performance of the PAG oil lubricant declined significantly. Mixing phosphorus-based additives with PAG in appropriate ratios is expected to improve the tribological performance of the oil. Moreover, the ZrO2 four-ball test revealed an atypical wear behavior causing serious wear scar due to the sintering of the ZrO2 ball. Nevertheless, the study demonstrates that phosphorus-based additives in the PAG oil lubricant can reduce the sintering of the ZrO2 ball.
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