Development of Novel Cemented Carbide for Overcoming Rare Metal Crisis by Preparing Nano-Meso Structure-Controlled Tungsten Carbide

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The WC involving the nano metal cobalt domains has been prepared by a gas-solid reaction between the cobalt non-equilibrium super saturated-tugsten powder and carbon mono-oxide gas (CO). The metal Co domains formed in the WC were found to be spherical with a diameter of approximately 60 nm by observing the microstructure with a high resolution transmission electron microscope. The tungsten less-hard metal prepared from the WC involving the nano metal cobalt domains shows high performance, resulted from its nano-scaled fine structure. Recyle of W and Co from the present hard metal is advantageous due to that it is composed of only WC and Co.