Lubricity of environmentally friendly HFO-1234yf refrigerant
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Global warming concerns have triggered the interest in alternative refrigerants for air-conditioning and refrigeration compressors. Newly developed refrigerant HFO-1234yf is an attractive and environmentally friendly candidate to replace existing hydrofluorocarbon refrigerants, such as R-134a. Herein, the tribological compatibility of gray cast iron material with this new refrigerant was investigated under aggressive unlubricated conditions. HFO-1234yf exhibits excellent performance compared to R-134a due to the formation of a fluorine-containing protective tribolayer on the topmost surface as X-ray photoelectron spectroscopy (XPS) analysis, inside and outside the wear tracks, revealed. The morphology of the layer was also studied using scanning electron microscopy (SEM) studies. 2012 Elsevier Ltd.
author list (cited authors)
Wasim Akram, M., Polychronopoulou, K., & Polycarpou, A. A.
complete list of authors
Wasim Akram, M||Polychronopoulou, Kyriaki||Polycarpou, Andreas A