Characterization of plasma-sprayed WC-Co coatings

Plasma-sprayed WC-Co coatings are used to combat wear and erosion. As-sprayed and heat-treated WC-Co coatings on mild steel substrates were characterized. The use of ArH 2 and ArHe gas mixtures was found to influence the loss of carbon and thereby the phases present in the coating. Quantitative X-...

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Bibliographic Details
Published in:Materials science and engineering 1986-12, Vol.84 (1-2), p.209-214
Main Authors: Subrahmanyam, J., Srivastava, M.P., Sivakumar, R.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Hot spraying
Joining, thermal cutting: metallurgical aspects
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
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Summary:Plasma-sprayed WC-Co coatings are used to combat wear and erosion. As-sprayed and heat-treated WC-Co coatings on mild steel substrates were characterized. The use of ArH 2 and ArHe gas mixtures was found to influence the loss of carbon and thereby the phases present in the coating. Quantitative X-ray diffraction was used to determine the amount of WC, W 2C and tungsten in the coatings. Heat treatment of the coatings at 1373 K for 1 h in vacuum resulted in the formation of Co 3W 3C in the coating and Co 6W 6C at the interface. The relative adherence of the coatings was evaluated by a three-point bending test. The wear properties were determined using a laboratory scratch tester. The heat-treated coatings were found to have a higher adherence and a higher scratch resistance.
ISSN:0025-5416
DOI:10.1016/0025-5416(86)90240-5