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Proceedings Papers
ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 1415-1418, May 25–29, 1998,
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The aim of this study was to improve the properties of atmospheric plasma sprayed WC-Co-Ni coatings by post treatment with induction heating. The spray powders used were WC-Co-Ni composite powders, produced by adding Ni-P alloy to WC-Co powder. Induction heating applied to the coating caused fusion of the Ni-P alloy with the WC-Co-Ni coating and a strong metallurgical bond with the steel substrate. An innovation in recent experiments was the use of an antioxidant paste applied to the outer surface of the coating under treatment. This eliminated the need for working under the restrictions of a hydrogen gas environment. The properties of the treated coating were investigated regarding microstructure, hardness, adhesive strength, abrasion resistance and porosity.
Proceedings Papers
ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 181-185, May 25–29, 1998,
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The purpose of this study is to investigate the microstructure and wear resistance of plasma sprayed WC-Co-Ni coatings. WC-Co-Ni composite powders were prepared by mixing of WC powder, Co powder and a Ni-P alloy powder, followed by sintering and crushing to improve the properties of plasma sprayed WC-Co coatings. In this study, their coatings were deposited by the atmospheric plasma spraying. The evaluation of their coatings were carried out by the observation of microstructure, measuring of microhardness values, adhesion strength values and an abrasive wear test. The abrasive wear resistance of the as-sprayed WC-Co-Ni coatings was comparable with that of WC-Co coatings deposited by HVOF spraying, and besides, the properties of the post-treated WC-Co-Ni coating were comparable with those of cemented carbides.