Patent ID: 6511551
Filing Date: 2003-01-28
Classification: B22F,C22C

Abstract:
A method of producing WC/Co cemented carbide, comprising the steps of:preparing a precursor powder by spray-drying an initial solution of a mixture of water-soluble salts of W and Co, which are the main components of said cemented carbide; adding and mixing a water-soluble salt including a grain growth inhibitor during mixing of said water-soluble salts of W and Co; desalting to remove salts by heating said precursor powder to obtain a desalted oxide composite powder; ball-milling to mix said desalted oxide composite powder with carbon black, resulting in composite oxides of fine particles of the carbon black and oxide composite powder; and preparing a composite cemented powder, by carburization and reduction, by heating a mixture including the fine particles of the carbon black and oxide composite powder in a non-oxidative atmosphere.