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Coatings 2018, 8(8), 268; https://doi.org/10.3390/coatings8080268

Sliding Wear Behavior of Fe-Al Coatings at High Temperatures

1
Centre de Projecció Tèrmica (CPT), Departament de Ciència dels Materials i Química Física, Universitat de Barcelona, 08028 Barcelona, Spain
2
Centre for Materials Research and Sintering Technology, Institute of Advanced Manufacturing Technology, 30-011 Krakow, Poland
3
Department of Materials Technology and Machinery, University of Warmia and Mazury, 10-719 Olsztyn, Poland
*
Author to whom correspondence should be addressed.
Received: 23 June 2018 / Revised: 17 July 2018 / Accepted: 26 July 2018 / Published: 31 July 2018
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Abstract

The medium and high temperature tribological behavior of different iron aluminide thermal spray coatings was investigated. Several powders synthesized through different routes (ball milling, self-decomposition, and self-propagating high-temperature sintering (SHS)) were evaluated. High heterogeneity of conventional High Velocity Oxygen Fuel (HVOF) coatings plays a vital role in their sliding performance, but as long as their integrity is preserved under high temperature oxidizing conditions, the wear rates are found to be acceptable, as it occurs in the case of ball milled Fe-40Al (at.%) powder. The friction phenomenon and wear mechanisms were analyzed in detail through the wear track morphology, contact surface, and friction coefficients. The occurrence of brittle phases in the sprayed coatings, which are also present when tested at high temperatures, appeared to be crucial in accelerating the coating failure. View Full-Text
Keywords: intermetallics; coatings; wear intermetallics; coatings; wear
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Cinca, N.; Cygan, S.; Senderowski, C.; Jaworska, L.; Dosta, S.; G. Cano, I.; Guilemany, J.M. Sliding Wear Behavior of Fe-Al Coatings at High Temperatures. Coatings 2018, 8, 268.

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