Cold spray deposition of Ni and WC-reinforced Ni matrix composite coatings

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1007/s11666-017-0636-4
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  1. National Research Council Canada. Automotive and Surface Transportation
FormatText
TypeArticle
Journal titleJournal of Thermal Spray Technology
ISSN1059-9630
1544-1016
Volume26
Issue8
Pages1908–1921
Subjectcold spraying; hardness; metal matrix composite; WC
Abstract
Ni-WC composites are ideal protective coatings against wear and are often fabricated using laser cladding and thermal spray processes, but the high temperatures of these processes result in decarburization, which deteriorates the performance of the coating. Cold spray has the potential to deposit Ni-WC composite coatings and retain the composition of the initial WC feedstock. However, the insignificant plastic deformation of hard WC particles makes it difficult to build up a high WC content coating by cold spray. By using three different WC powder sizes, the effect of feedstock powder size on WC retention was tested. To improve WC retention, a WC/Ni composite powder in mixture with Ni was also sprayed. Microstructural characterization, including the deformed structure of Ni splats, retention, distribution, and fragmentation of WC, was performed by scanning electron microscopy. An improvement in WC retention was achieved using finer WC particles. Significant improvement in WC particles retention was achieved using WC/Ni composite powder, with the WC content in the coating being close to that of the feedstock.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NPARC number23002646
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Record identifier588aec92-33c6-4e7e-989e-635763c6669a
Record created2017-12-08
Record modified2019-03-13
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