발간논문

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Vol.16, No.1, 3 ~ 12, 1978
Title
Activated Sintering of the W Cemented WC for high density - hard metal
원명호M . H . Won, 권영순Y . S . Kwon, 문인형I . H . Moon
Abstract
To investigate whether tungsten carbide (WC)-hard metal of the higher density and hardness than conventional one could be obtained, tungsten was substituted for cobalt as binder metal, and then this WC-W system was activatedly sintered with adding small amount of Co or Ni. The influences of activators as well as tungsten binder on the sintering kinetics, and on the microstructure of this sintered alloy and its mechanical properties have been studied. The highest fractional volume shrinkage could be obtained in the 10% W contained specimen independently of the sintering temperature and a kind of activators under conditions of the present experiment. The observed activation energy for the process of activated sintering was about 35㎉/mole for the specimen of 10% W. Contrary to the activated sintering of pure tengsten compact, Co was more effective in promoting shrinkage than Ni in the sintering of the present WC-W system. The hardness of the W-cemented WC-hard metal was relatively higher than that of the conventional Co-cemented one. However it showed brittleness and poor strength.
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