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We report on the tribological performance of gray cast iron with different lubricants, namely PAG (Polyalkylene glycol), POE (Polyolester), and Mineral oil, in the presence of environmentally friendly HFO-1234yf refrigerant. Two operating temperatures (24°C and 110°C) were used to investigate the mutual solubility of lubricant/refrigerant systems. PAG/HFO-1234yf exhibited better tribological performance...
Environmental concerns have increased the interest in alternative natural refrigerants for air-conditioning and refrigeration compressors. Carbon dioxide (CO 2 ) or R744 is an attractive candidate to replace harmful hydrofluorocarbon refrigerants, which will need to be replaced in the near future due to their high global warming potential. In this paper the tribological behavior of gray cast...
Carbon dioxide (CO 2 ) has received significant interest as an alternative refrigerant for air-conditioning compressors due to its environmental benefits. These environmental benefits include zero ozone depletion potential and minimal global warming potential compared to commonly used hydrochlorofluorocarbon and hydrofluorocarbon refrigerants. This study presents results for three typical...
Scuffing can lead to catastrophic failure in engineering components, but the surface mechanism that leads to scuffing is not well understood. In this experimental study, the surface and subsurface changes on gray cast iron and Al390-T6 were investigated under starved lubrication (a mixture of R410A refrigerant combined with a polyolester lubricant) and pure sliding. Controlled tribological experiments...
Controlled tribological scuffing experiments were conducted on typical engineering surfaces (Al390-T6 discs and 52100 steel pins) under starved lubrication conditions (a mixture of R410A refrigerant combined with a polyolester (POE) lubricant) to simulate the contact conditions in an automotive air conditioning compressor. The time-to-scuff was established and was repeatable using a test protocol...
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