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CSME 2020/12
Volume 41 No.6
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791-798
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Wear Scar Evolution during Four-ball Test in PAG Oil Containing Different Additives under R134a Refrigerant Environment
Yuan-Ching Lina, Yi-Cheng Guoa, Chia-Hsun Chenga, Sheng-Hung Hsiehb, Yang-Guang Liub, Kun-Yi Liangc and Yau-Bin Yangc
aDepartment of Mechanical Engineering, Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10670, R.O.C.
bHanbell Precise Machinery Co. Ltd. Taoyuan, Taiwan 32853, R.O.C.
cGreen Energy and Enviroment Research Laboratories of Industrial Technology Research Institute, HsinChu, Taiwan 31057, R.O.C
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Abstract:
In this work, the extreme pressure performance of different additives blended with PAG oil was evaluated in refrigerant environment, and the wear scar evolution of four ball test was also monitoring step by step. The four-ball sliding wear test condition was set to simulate the operation of the components in the air conditioner compressor. The experiment results showed that the wear scar at the initial stage of the wear test extended rapidly due to higher contact stress. Then, the enlarging of the wear scar reduced gradually because the additive formed an effective tribofilm on the rubbing surfaces along with the contact stress reduced by the contact area extended. In addition, the results showed that PAG oil has good tribological performance in R134a refrigerant environment, and using the P-based EP additives in PAG oil could effectively improve the tribological performance of the PAG oil under extreme pressure condition.
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Keywords: Four-Ball test; EP Performance; EP additives; AW additives
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©
2020
CSME , ISSN 0257-9731
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