Cladding WC-Co based materials to protect them from decarburization caused by the heat of the thermal spray gun

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/j.surfcoat.2016.09.076
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Name affiliation
  1. National Research Council of Canada. Automotive and Surface Transportation
FormatText, Article
Journal titleSurface & Coatings Technology
ISSN0257-8972
1879-3347
Volume309
Pages355–362
SubjectHVOF coatings; WC-Cr-Co cermet powders; carbide degradation; carbide protection; cladding material; endothermic reaction
Abstract
Two types of commercial cermet powders WC-10Co-4Cr and nanostructured WC-12Co were modified by cladding thin layers of magnesium oxide onto their surface. The objective was to protect the WC phase from decarburization that regularly results from thermal spray. As-received and cladded powders were deposited by using the HVOF thermal spray technique. The coatings features were investigated by using several characterization techniques. The results show that original spray powders were thermally protected by the layer of magnesium oxide clad on their surface that acts as a sacrificial material. This cladding material vanished partially endothermically by sublimation, fusion followed by evaporation, by endothermic reaction with the spraying atmosphere or acted as refractory material and did not much affect the original material. Thus, less heat was transferred from the flame onto original powders, and coatings produced following this process presented less degradation (conservation of the initial phases and structures) which was reflected by better mechanical properties.
Publication date
PublisherElsevier
LanguageEnglish
Peer reviewedYes
NPARC number23002644
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