Abstract
This paper deals with the preparation and development of carbon nanotubes (CNT)-reinforced chromium oxide coatings. The 8% by weight CNT was reinforced with 92% by weight chromium oxide. The composite powder was blended in a ball mill and deposited successfully with high velocity oxy-fuel spraying technique. The microhardness of CNT-reinforced coating was found to be 30% higher than conventional coatings. The CNT reinforcement was able to decrease porosity of composite by 20%. The XRD spectrum indicated that CNT were present in pure graphite form and were found to be chemically inert during the spraying process. CNT did not react with chromium oxide to form carbides. The metallurgical analysis of surface and cross-section of composite coating revealed that CNT were uniformly distributed throughout the composite matrix, and formed a bridge-like structure between the splats of chromium oxide, which improved the properties of composite coating.
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