The paper describes the fabrication process of refractory carbides, ZrC and HfC, dispersed tungsten composites by spark plasma sintering. The contents of particles varied from 0 to 30 vol % and sintering was conducted for 3 min at 1700°C. After the sintering of W/ZrC powder mixtures, ZrC phases were decomposed into W_2C and Zr up to 20 vol% of ZrC particles. With 30 vol% of particles, some of ZrC particles were retained in the composite. However, although the amount of HfC particles was increased, most of HfC phases were remained. From these results, HfC particles seemed to be more stable phase in the tungsten matrix at high temperature.
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