Performance of plasma-sprayed CuNiIn coatings and Mo coatings subjected to fretting fatigue

Abstract

During atmospheric plasma spraying, a cooling process usually plays an important role in the coating quality, especially for the oxidation containment of metallic coatings. CuNiIn and Mo coatings were prepared using atmospheric plasma spraying with different cooling processes. The obtained coatings were characterized in terms of microstructure, microhardness and tensile strengths. The relation between the coating microstructure and their fretting fatigue behavior was emphasized. The results show that the sensitivity of Mo coatings to the cooling process is lower than CuNiIn coatings. The resistance to fretting fatigue is determined by the coating microhardness, correlated with the contents of oxides and pores. The fretting wear mechanisms of both the coatings are galling, third body abrasive wear and material transfer.

Keywords

• CuNiIn coatings
• Mo coatings
• Atmospheric plasma spraying
• Fretting fatigue