A typical Ti（C, N）-based cermet and another cermet with grain growth inhibitor Cr3C2 were studied using scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, energy dispersive X-ray analys...A typical Ti（C, N）-based cermet and another cermet with grain growth inhibitor Cr3C2 were studied using scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, energy dispersive X-ray analysis （EDX）. The two cermets have a “core-rim” structure. The structure is formed by dissolution of small ceramic grains and precipitation of （Ti, Mo, W）（C, N） around the remaining TiC core. Most of chromium element congregated in the rim phase when Cr3C2 was added. During liquid phase sintering Cr3C2 solved in binder phase and congregated around the hard grains, which reduced the solubility of TiC in liquid phase, and consequently restrained the dissolution and reprecipitation, the grains were restrained from growing up during sintering.展开更多
文摘A typical Ti（C, N）-based cermet and another cermet with grain growth inhibitor Cr3C2 were studied using scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, energy dispersive X-ray analysis （EDX）. The two cermets have a “core-rim” structure. The structure is formed by dissolution of small ceramic grains and precipitation of （Ti, Mo, W）（C, N） around the remaining TiC core. Most of chromium element congregated in the rim phase when Cr3C2 was added. During liquid phase sintering Cr3C2 solved in binder phase and congregated around the hard grains, which reduced the solubility of TiC in liquid phase, and consequently restrained the dissolution and reprecipitation, the grains were restrained from growing up during sintering.
