Microstructure and properties of pLASMA-sPRAYED Mo-Mo2C composites

Plasma-sprayed molybdenum coatings are relatively soft and require dispersion strengthening (e.g., Mo2C) or addition of a second phase (e.g., NiCrBSi) to improve hardness, wear resistance, and thus coating performance. In this study, Mo-Mo2C composite powders were plasma sprayed onto mild steel subs...

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Bibliographic Details
Published in:Journal of thermal spray technology 1994-09, Vol.3 (3), p.282-288
Main Authors: Sampath, S., Wayne, S. F.
Format: Article
Language:English
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Summary:Plasma-sprayed molybdenum coatings are relatively soft and require dispersion strengthening (e.g., Mo2C) or addition of a second phase (e.g., NiCrBSi) to improve hardness, wear resistance, and thus coating performance. In this study, Mo-Mo2C composite powders were plasma sprayed onto mild steel substrates. Considerable decarburization was observed during air plasma spraying, which is a beneficial condition because carbon acts as a sacrificial getter for the oxygen, thereby reducing the oxide content in the coating. Finer powders showed a greater degree of decarburization due to the increased surface area. However, the starting carbide content in the powder exerted very little influence on the extent of decarburization. The friction properties of Mo-Mo2C coatings were significantly improved compared to those of pure molybdenum under continuous sliding contact conditions. It was also found that the abrasion resistance of the coatings improved with increasing carbide addition. (Author)
ISSN:1059-9630
1544-1016
DOI:10.1007/BF02646273