| Summary: | 碩士 === 國立交通大學 === 機械工程系 === 87 === ABSTRACT
In order to protect the steel maker's sink rolls surface used in continuous hot-dip galvanising line, cermet coatings were prepared by High Velocity Oxygen Fuel spraying process 。The purpose of this project is to study the anti-adhesion of Zn dross of the cermet coatings in the molten zinc bath。
This experiment was to explore the mechanical properties of WC-Co and WC-CrC-Ni cermet coating using High Velocity Oxygen Spraying process。The coated specimens were immersed in molten pure zinc or in the molten zinc-aluminum at 480℃。The Zn diffusion layer was messured by Line Scanning of Scanning Electron Microscape (SEM) and Electron Probe Microanalyzer (EPMA) 。The resistance of adhesion of Zn dross to the coating was also studied。
Experimental procedures included tensile test, microhandness test, optical metallographicoexamination, surface roughness test, porosity test and Zn diffusion layer test were conducted。
The experimental results showed that the diffusion layer was grown under the surface of the sprayed coatings that may depend on the interdiffusion of Co and Zn atoms。The phenomenon of this Zn diffusion added with Al in molten Zinc bath and the diffusion layer can be suppressed。
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