The present paper describes the developing process of poreless diamond wheel of vitrified bond and its ability on the grinding of cemented carbides. From the investigation of affinity between diamond and ceramics solvents, it was clarified thatboth carbonates of K and Na show high affinity for diamond. Hard, tenacious bonding matrixes were obtained by the chemical reaction between both carbonates and SiO{sub}2 in alumina and kaolinite. Large bonding strength was obtained with the contents ofboth carbonates of 15 to 20 wt% on the sintering temperature of 1123 K under the sintering durations of 180 mm. In the grinding tests of the newly developed wheels, the little wear of wheel and the large grinding ratio were obtained by means of the large elastic failure energy of wheel under the constituent conditions of wheel that the frit is rich, the size ofdiamond abrasive grains is small and the concentrations of abrasive grain are much. Consequently, it is possible to manufacture the poreless diamond wheel of vitrified bond which is superior to metal bond diamond wheel.
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