| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 104 === 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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