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Coatings, Volume 4, Issue 1 (March 2014) , Pages 1-202
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Cover Story (view full-size image) In this study, the microstructural details and tribological performances of Fe-based coatings [...] Read more. In this study, the microstructural details and tribological performances of Fe-based coatings (Fe–Cr–Ni–B–C and Fe–Cr–Ni–B–Mo–C) manufactured by HVOF thermal spray process are evaluated. Ni–Cr–Fe–Si–B–C and WC–CoCr coatings were chosen as references. Microstructural investigation reveals a high density and low oxide content for HVOF Fe-based coatings. Particle melting and rapid solidification resulted in a metastable austenitic phase with precipitates of mixed carbides and borides of chromium and iron which lead to remarkably high nanohardness. Tribological performances were evaluated by means of the ball on-disk dry sliding wear test, the rubber-wheel dry particle abrasion test, and the cavitation erosion wear test. A higher wear resistance validates Fe-based coatings as a future alternative to the more expensive and less environmentally friendly Ni-based alloys. View this paper.