本文利用四球式磨耗試驗機進行兩種極壓添加劑在冷凍潤滑油中的耐極壓能力評估，並且探討在不同冷媒環境下以及長時間磨耗過程中，極壓添加劑的磨潤特性。而兩種極壓添加劑分別以重量百分比0.5%、1%、5%與冷凍潤滑油混合，起始實驗油溫分別在室溫25℃以及高溫80℃環境下，於不同負載中以固定滑移速度進行1小時的磨耗試驗，目的為比較不同添加濃度及初始油溫對於磨耗行為的影響。最後針對兩種極壓添加劑在最佳濃度下進行冷媒環境和長時間的磨耗試驗。試驗結果顯示硫系與氯系極壓添加劑分別在0.5wt%及5wt%濃度下有最好的耐極壓能力；在冷媒環境下的磨耗試驗中，冷媒R134a溶入混合油後在低負載下有助於抗磨耗能力的提升，R32冷媒環境下油品的抗磨耗能力改變不明顯，且會加速硫系添加劑與表面金屬反應。而在兩種冷媒下混合油的耐極壓能力均下降；在試驗時間延長後，因硫系極壓添加劑活性高，化合膜生成速率較快，因此在長時間磨耗下，磨疤尺寸在相對較小時，即可到達穩態磨耗狀態，因此有較高的最終穩態應力。因不同負載下的接觸應力影響與實驗最終所得磨疤尺寸有極大關聯，因此本文提出一影響穩態磨耗的評估準則，推論出在低負載下較能進入穩態磨耗。

The resistance of the extreme pressure (E.P.) and anti-wear (A.W.) on different kinds of the extreme pressure additives (E.P. additives) under the extreme pressure conditions is the major object of this study. The refrigerant oil blend into weight percantage concentration with 0.5%, 1% and 5% of the E.P. additives. In order to know how the resistance of the extreme pressure and antiwear affected by the concentration of the E.P. additive and the oil temperature. The wear test is in fixed sliding speed during the 1hr test. And the oil temperature are at room temperature (25℃) and 80℃. After the test and changed the load. After finding the optimal concentration of the E.P. additves, they are used to do the long time wear test and blend into refrigerants.
The result shows that the concentration of sulfur and chlorine in 0.5wt% and 5wt% has the best extreme pressure and anti-wear resistance. And refrigerant R134a has good performance in anti-wear resistance in the low load but refrigerant R32 is not and it make the reation rate of the sulfur E.P. additive up. But all refrigerants has poor performance in extreme pressure resistance. In long time wear test, mixed oil with surfur E.P. has the lowerest wear scar diameter in the same test time. So when wear test in the steady state, the mixed oil with surfur E.P. has the highest steady state stress.

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