Effect of heat treatment environment on the structural characteristics and microhardness of high velocity oxy-fuel sprayed tungsten carbide-cobalt coatings |
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| Authors: | AR Govande JK Katiyar BR Sunil R Dumpala |
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| Affiliation: | 1. Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, 440010 India;2. Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur Campus, Tamil Nadu, 603203 India;3. Department of Mechanical Engineering, Bapatla Engineering College, Bapatla, 522101 India |
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| Abstract: | In the present study, tungsten carbide-cobalt was coated on the austenitic stainless steel using high velocity oxy-fuel spraying. The as-deposited coatings were heat treated at 750 °C in air and argon gas environments. Structural characteristics of these coatings were studied using x-ray diffraction and Raman spectrum analysis. Further, the microhardness of the polished coated samples was also evaluated. The hardness of the coatings was significantly improved after heat treatment in air and argon gas environment. However, the highest hardness was observed with the coatings treated in argon gas environment. The formation of oxide phases such as tungsten trioxide and cobalt tungstate was observed after heat treatment in the air environment, whereas under the argon environment, no oxide phases were observed. |
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| Keywords: | Tungsten carbide-cobalt Heat treatment Raman analysis Microhardness High velocity oxy-fuel Wolframkarbid-Kobalt Wärmebehandlung Ramananalyse Mikrohärte Hochgeschwindigkeitsflammspritzen |
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