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문인형,권영순,원명호 대한금속재료학회(대한금속학회) 1978 대한금속·재료학회지 Vol.16 No.1
높은 密度와 硬度를 갖는 超硬材의 개발을 위해 Co 대신 W을 接合한 WC-W系에 미량의 Co 및 Ni을 첨가하여 活性燒結을 행하였다. 活性劑 및 접합 W의 量에 따른 燒結擧動, 組織特性 및 기계적 성질등을 조사하였다. W接合에 따른 수축거동은 10% 접합에서 가장 큰 수축현상을 보였으며 소결 진행의 활성화 energy는 약 35㎉/mole 이였다. W의 活性燒結과는 달리 活性劑로서의 기능은 Co는 Ni에 비해 양호한 活性效果를 보여 주었다. 燒結體의 硬度는 10% W 접합에서 HR_A 92를 보여 超硬合金으로서의 비교적 높은 경도값을 나타냈으며 취성이 큰 超硬燒結體의 전형적인 낮은 강도를 보여 주었다. 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.