Plasma- and vacuum-plasma-sprayed Cr3C2 composite coatings |
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Authors: | JD Reardon R Mignogna FN Longo |
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Affiliation: | Materials Engineering Department, Metco Inc., Westbury, NY 11590 U.S.A. |
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Abstract: | Plasma- and detonation-sprayed chromium carbide-Nichrome coatings have long been used for applications requiring superior wear resistance at temperatures up to 820°C. The coatings are typically sprayed from mechanical blends of powder containing from 17 to 35 wt.% Nichrome. These coatings are susceptible to non-uniformity of microstructure because of segregation of the blended powders. Oxide formation occurs in both ambient atmosphere plasma and detonation-applied coatings.A new Cr3C2![/>Nichrome composite powder was developed for application by the plasma and vacuum plasma processes. The developed material consists of 50 wt.% Cr<sub>3</sub>C<sub>2</sub> clad with 50 wt.% 80-20 Nichrome. Unlike powder blends, each Cr<sub>3</sub>C<sub>2</sub> powder particle is clad with an essentially continuous layer of Nichrome. The developed material is sized ?270 mesh + 5 μm.Coatings of the composite Cr<sub>3</sub>C<sub>2</sub> material were sprayed using the conventional non-transferred arc plasma and the low pressure low oxygen vacuum plasma processes. These coatings were compared with coatings sprayed from a commercially available blend of 75 wt.% Cr<sub>3</sub>C<sub>2</sub><img style=](https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd) | |
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