Influence of carbon content on formation of gradient structure of cemented carbide for mining

Cemented carbide with gradient cobalt structure was fabricated by use of two-step method(presintering-carbusintering). The relationship between the morphology and content of η phase and the carbon content was studied. The influences of the carbusintering temperature and carbon content on the formation of the gradient structure of the cemented carbide for mining were discussed, and the formation mechanism of gradient structure was analyzed. The results show that the carbon content and carbusintering temperature are the main parameters that influence the formation of gradient structure. The higher the carbon content is, the more apparent and the thicker the gradient structure are; the higher the carbusintering temperature is, and the less apparent the gradient structure becomes. The results also show that the parameters above-mentioned influence the formation of the gradient structure by affecting the diffusion of carbon and liquid flow.