Effect of milling of C and Ti mixture as ceramic coating on the properties of 7Ch3 tool steel during plasma spray process

Abstract

In this study, the effect of milling time of processed powder coatings on the properties of 7Ch3 tool steel during plasma spray process was investigated. For this purpose, raw materials containing powders of titanium and carbon with stoichiometric ratio were milled and samples were taken in different time intervals. After phase investigations by X-ray diffraction, three milled samples as just mixed, activated and synthesized specimens were selected and coated on the substrate. The obtained results showed that titanium carbide can be successfully synthesized by mechanical alloying based on a gradual mechanism. Crystalline sizes of the synthesized carbide were found to be in nano-meter scale. Deposited coating leads to an increase in mechanical and wear properties of the substrate. The average sizes of coatings remained in nano-meter order too. Studies revealed that the sample which was coated by activated mixture had the best measured properties among the other specimens.