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Abstract
Reaction thermodynamics was utilized to analyze the selective carbonization conditions of ZrO2‐TiO2‐Y2O3 ultrafine powder and to define the temperature range of the selective carbonization. The ZrO2‐TiO2‐Y2O3 powder was prepared by coprecipitation from a solution containing Zr4+, Ti4+, and Y3+. The powder was selectively carbonized at 1350°, 1450°, 1550°, and 1650°C, respectively, for 2 h under argon atmosphere with sucrose as the carbon source. The resulting product was analyzed by X‐ray diffraction. The experimental results indicated that the ZrO2‐TiO2‐Y2O3 powder could be selectively carbonized in situ at 1450°C to form a carbonized powder which was composed of TiC and t‐ZrO2. It was also found that zirconium carbide could be formed at 1550°C, which is much lower than the carbonization temperature of ZrO2 defined by thermodynamics.
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