Abstract
Ultra-fine zirconium carbide powder with particle size below 200nm was produced by the carbothermal reduction of ZrO2, graphite powder, and subsequent mechanical milling. After heat-treatment at 1400°C for 2h under vacuum, ZrC agglomerates (average size, 7.53μm) were obtained with crystallite sizes of ~200nm. Mechanical bead mill proved to be efficient in dispersing the ZrC powder agglomerates into separate ZrC particles with a narrow particle-size distribution. Only 10min of milling produced ultra-fine ZrC powder with an average particle size of 170nm. The synthesized ZrC was found to be compatible with W powder.
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