Abstract：Single-phase solid solution ceramic powders TaZr2.75C3.75 were synthesized by combining solvothermal and carbothermal reduction. In which, TaCl5 and ZrCl4 were used as the tantalum and zirconium source respectively and phenolic resin was used as the carbon source. The possibility of the synthesis of TaZr2.75C3.75 powders by the carbothermal reduction method was demonstrated by thermodynamic and atomic size effect. The effects of process parameters such as acetylacetone content, metal atom concentration and solvent type on the powder morphology and particle size were investigated. The results show that the single-phase TaZr2.75C3.75 solid solution ceramic powders can be prepared by the carbothermal reduction reaction at 1 700 ℃. Increasing the content of acetylacetone can improve the dispersibility of the powders. With increasing the concentration of metal atoms, the powder changes from a spherical shape to an irregular shape, and the average particle size decreases from the micron level (~2.13 µm) to the submicron level (~0.140 µm). Compared witn butanol solvent, better dispersion and smaller particle size of TaZr2.75C3.75 solid solution ceramic powders can be achieved with ethanol as a solvent.
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2022, Vol. 27 
