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Microstructure and Wear Behavior of Plasma‐Sprayed Nanostructured WC–Co Coatings
Author(s) -
Di Girolamo Giovanni,
Marra Francesco,
Pilloni L.,
Pulci Giovanni,
Tirillò Jacopo,
Valente Teodoro
Publication year - 2012
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2011.02734.x
Subject(s) - decarburization , materials science , microstructure , cermet , coating , scanning electron microscope , tribology , indentation hardness , metallurgy , atmospheric pressure plasma , thermal spraying , plasma , composite material , ceramic , physics , quantum mechanics
Atmospheric plasma spraying of WC–Co particles with standard gas mixtures ( Ar–H 2 ) typically results in largely decarburized coatings with relatively low wear resistance. To fabricate cermet coatings with enhanced tribological properties, nanostructured WC–Co coatings were plasma sprayed using two different process gas mixtures. Phase composition and microstructure were investigated by X‐ray diffraction and scanning electron microscopy, respectively. Microhardness increased by increasing the amount of retained WC grains in coating microstructure. Friction and wear properties, measured under dry sliding conditions, strongly depended on the degree of decarburization. They were comparable to those of conventional coatings produced using identical conditions.