1999 Fiscal Year Final Research Report Summary
A study on development of lubricants for an alternative refrigerant
| Project/Area Number |
09650166
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
設計工学・機械要素・トライボロジー
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
GONDO Seigo Science Engineering Faculty of Engineering, Kyushu University, Assistant, 大学院・工学研究科, 助手 (50037975)
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| Co-Investigator(Kenkyū-buntansha) |
ONO Bunji Science Engineering Faculty of Engineering, Kyushu University, Assistant, 大学院・工学研究科, 助手 (60224276)
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| Project Period (FY) |
1997 – 1999
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| Keywords | Friction and Wear / Tribology / Oil film thickness / Reaction film / Adsorption film / Alternative refrigerant / Solidified film |
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| Research Abstract |
Using R134 as a refrigerant and polyalkylene glycol, and polyolester, polyvinylether, the fiction and wear characteristics of Al-Si alloys, which appear to be promising due to their low density and high strength-to-weight ratio, sliding against steels in R134a with different additives. The results obtained are as follows.
1. The solubility characteristics of R134a in oils
It was confirmed that the dissolution of R134a into oils brought about the reduction of their viscosity leading to the decrease in oil film thickness or to the oil film rupture.
The degree of reduction in viscosity was affected not only by the concentration of R134a in oils but also by the mean molecular weight of oils.
2. The effect of R134a dissolution on oil film formation
Oil film thickness was measured by means of an optical interferometry technique with a ball/plate reciprocating apparatus. As the solubility of R134a in oils increased, the oil film thickness became thinner and the amount of Al-Si alloys increased.
3. Wear characteristics
The friction and wear performance was examined with steel/steel and steel/Al-Si alloys pairs in R134a using a reciprocating sliding contact apparatus. With steel/steel pairs, the friction and wear characteristics were significantly affected by absorbed and/or reacted films formed on the rubbing surfaces, and the solidified films on oils. On the other hand, for steel/Al-Si alloys pairs, the wear characteristics of Al-Si alloys was mainly controlled by the transfer property of alloys to the mating steel surface, which was promoted as the polarity of oils became high leading to an increase in the wear.
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Research Products
(10 results)
