本研究目的在於研究磷系與二烷基二硫代磷酸鋅(Zinc Dialkyl Dithiophsphates, ZDDP)添加劑於聚烷基二醇合成油(Poly Alkylene Glycol, PAG)中之耐極壓性能。透過在不同負載、溫度及試驗時間條件下進行四球滑動磨耗試驗，評估試驗用油之耐極壓性能與磨疤演變，亦在磨耗試驗過程中通入R134a冷媒用以評估在冷媒對於試驗用油磨潤性能之影響。

　　結果顯示加入適當添加劑能有效改善PAG冷凍油之耐極壓性能，且於高溫、高負載條件下提升更為顯著。且在磨耗試驗初期因磨耗表面產生之高接觸溫度，添加劑即開始啟動與基材之反應生成化合膜。而在冷媒環境下則須考慮基礎油、添加劑與冷媒三者間之相容性。

　　陶瓷球因具有較高之化學惰性，難與添加劑產生反應形成化合膜，但在極壓狀態下仍會與添加劑反應生成化合膜。

　　This study was conducted to investigate the extreme performance of phosphorus-based and zinc dialkyl dithiophosphate (ZDDP) additives mixed with poly alkylene glycol (PAG) oil by implementing the four-ball sliding wear test under different loading, oil temperature, and test duration conditions. The extreme pressure (EP) performance and evolution of the wear scar were evaluated. Additionally, the refrigerant R134a was mixed into the test oil during the wear test to evaluate its effects on the tribological performance of the test oil.

　　The results show that the addition of appropriate additives could effectively improve the EP performance of PAG oil. Furthermore, under the conditions of high temperature and high load, the positive effects of the additives on the EP performance were more significant. Moreover, at the beginning of the wear test, because the high contact temperature was generated as a result of the worn surface, the additive began reacting with the substrate to form a compound film. However, when refrigerants are used, its compatibility with the base oil and additives must be considered.

　　Because the ceramic material has high chemical inertness, it did not readily react with the additive to form a compound film. However, it reacted with the additive to form a compound film under EP conditions.

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