| Title |
Sintering Characteristics of WC - SiC - 10Ni Hard Materials with TiC Addition |
| Authors |
조석현(Sug Hyeon Cho); 황선근(Sun Keun Hwang); 박원구(Won Koo Park); 이억섭(Ouk 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. |