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Abstract
The influence of dissolved refrigerant HFC134a on tribological performance of lubricants for HFC refrigerants was investigated by measuring the solubility of lubricants, and the viscosity reduction and change in oil film thickness of HFC134a/lubricant mixtures in a reciprocating motion. The wear characteristics of an aluminum alloy for the mixtures were also studied. It was found that HFC134a dissolution was exothermic reaction, and the solubility defined by the saturated concentration of HFC134a in lubricants decreased with an increase in the cohesive energy density of lubricants. The reduction in viscosity was affected not only by HFC134a concentration in the lubricants but also by the mean molecular weight of lubricants. The decrease in oil viscosity by dissolved HFC134a made the wear characteristics worse due to reducing the oil film thickness.