Hydrofluoroolefin-based refrigerant (2,3,3,3-tetrafluoropropene, namely, HFO-1234yf), which has been developed as an environmentally friendly refrigerant, is proposed as a direct replacement solution in automotive air-conditioning compressor applications. In the present work, the wear mechanisms of this refrigerant using gray cast iron interfaces were investigated under a wide range of operating conditions. A critical velocity was measured from scuffing type experiments, where beyond that maximum interfacial loads did not change significantly with sliding velocity, suggesting a mechanical rubbing-type wear mechanism. Below the critical velocity, scuffing loads decreased almost linearly with sliding velocities. Wear type experiments identified two different wear mechanisms, namely, oxygen-dominating and fluorine-dominating wear, depending on sliding velocities and normal loads. Oxygen-dominating wear mechanism prevailed under low sliding velocities and normal loads. In contrast, fluorine-dominating wear was predominant under moderate sliding velocities and low or moderate loads. The formation of protective tribofilms and their effect on the wear mechanism was used to construct a wear map.
Wear Mechanisms of Gray Cast Iron in the Presence of Environmentally Friendly Hydrofluoroolefin-Based Refrigerant and the Effect of Tribofilm Formation
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 6, 2014; final manuscript received March 21, 2015; published online July 9, 2015. Assoc. Editor: Satish V. Kailas.
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Wasim Akram, M., and Polycarpou, A. A. (October 1, 2015). "Wear Mechanisms of Gray Cast Iron in the Presence of Environmentally Friendly Hydrofluoroolefin-Based Refrigerant and the Effect of Tribofilm Formation." ASME. J. Tribol. October 2015; 137(4): 041602. https://doi.org/10.1115/1.4030711
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