原位选择性碳化法制备ZrO_2-TiC粉末  

PREPARATION OF ZrO2-TiC POWDER BY IN_SITU SELECTIVE CARBONIZATION

作　　者：刘继富[1] 李建保[1] 王厚亮[1] 

机构地区：[1]清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室

出　　处：《硅酸盐学报》1999年第3期342-345,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金

摘　　要：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，确定了原位选择性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Ｚｒ４＋，Ｔｉ４＋和Ｙ３＋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Ｘ射线衍射分析．实验结果表明，ＴｉＯ２－ＺｒＯ２－Ｙ２Ｏ３粉末可以在１４５０℃进行原位选择性碳化，碳化后的粉末相组成为ｔ－ＺｒＯ２和ＴｉＣ．此外还发现碳化锆可以在１５５０℃形成，这低于热力学计算确定的氧化锆碳化温度．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.

关 键 词：热力学计算 选择性碳化 碳化钛 二氧化锆 陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业]