발간논문

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Vol.32, No.7, 786 ~ 792, 1994
Title
Sintering Characteristics of WC - SiC - 10Ni Hard Materials with TiC Addition
조석현Sug Hyeon Cho, 황선근Sun Keun Hwang, 박원구Won Koo Park, 이억섭Ouk Sub Lee
Abstract
A complex tungsten carbide alloy with Ni as binding metal and TiC and SiC as additives was developed. The chemical composition and processing technique were designed such that SiC coated the WC particles prior to sintering. The additives were found to improve density and limited the rate of grain coarsening during sintering. As a result, a fine grain size in the range of 1 to 2 ㎛ and a Vickers microhardness of greater than 1600 were obtained. The role of SiC was viewed as hindering the mobility of WC particle boundary. Apparently, TiC reduced the grain size by decreasing the extent of solution and re-precipitation of WC in Ni. The increased hardness due to the addition of TiC was attributed to the solid solution hardening of both WC matrix and the interface. An evidence to support this hypothesis was presented by analyzing the distribution characteristics of the participating elements in microscopic scals.
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