原位选择性碳化法制备ZrO2-TiC粉末

利用热力学基本原理分析计算了ＴｉＯ２－ＺｒＯ２－Ｙ２Ｏ３系统的原位选择性碳化条件，确定了原位选择碳化的温度并研究了碳化温度对该系统碳化后的相组成的影响。用含有Ｚｒ＾４＋，Ｔｉ＾４＋，和Ｙ＾３＋的溶液，采用共沉淀法制备了ＴｉＯ２－ＺｒＯ２－Ｙ２Ｏ３超细粉料，然后以蔗糖作为碳化剂，在氩气氛下，分别在１３５０，１４５０，１５５０和１６５０℃进行２ｈ的碳化，然后进行了Ｘ射线衍射分析。

PREPARATION OF ZrO2-TiC POWDER BY IN_SITU SELECTIVE CARBONIZATION

Theory of reaction thermodynamics was utilized to analyse the in_situ selective carbonization conditions for ZrO2-TiO2-Y2O3 ultrafine powder and to determine 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 1 350, 1 450, 1 550, 1 650 for 2 h respectively under argon atmosphere with sucrose as carbonization agent, then analysed by X-ray diffraction. The experimental results indicate that the ZrO2-TiO2-Y2O3 powder can be selectively carbonized in_situ at 1 450 and after carbonization the powder is found to be composed of TiC and t-ZrO2. It is also found that zirconium carbide can be formed at 1 550 , which is lower than the carbonization temperature of ZrO2 defined by thermodynamics.