以氢氧化钙和氯氧锆为原料, 氢氧化钾为矿化剂, 在150～250℃和6～12h的水热条件下, 制备出粉体前驱物, 对该前驱物进行900～1000℃焙烧处理, 得到CaZrO3微粉. 讨论了水热合成条件如: 原料种类、钙锆摩尔配比、反应温度、晶化时间等对水热合成的产物结构和形貌的影响, 焙烧温度对CaZrO3显微结构的影响. XRD和SEM结果显示: 在钙锆摩尔配比为2:1, 水热合成温度为200℃, 水热合成时间为8h, 焙烧温度为900℃, 即能得到CaZrO3晶体. 随水热合成温度升高, 晶化时间延长, CaZrO3晶粒长大, 团聚较少, 粒度分布为0.5～3.0μm, 具有良好的烧结活性, 可以作为CaZrO3耐火材料使用.
The CaZrO3 powder precursors were prepared from raw material of Ca(OH)2 and ZrOCl2, KOH as the mineralizer, under the hydrothermal reaction conditions of 15-250℃ and 6-12h. The CaZrO3 powder was obtained by calcing the precursors at 900-1000℃. The article discussed the effects of the ratio of Ca to Zr in raw material, crystal temperature, crystal time and pH of solution on the structure and state of the product from hydrothermal synthesis, as well as the effect of calcing temperature on the crystal microstructure of CaZrO3. The results of XRD and SEM show that the crystal of CaZrO3 can be obtained under the conditions of n(Ca):n(Zr)=2:1, at 200℃, for 6h and calcing temperature of 900℃. With the rising of synthesis temperature, the lasting of crystal time and the rising of calcing temperature, the crystal grain size increases, and has less aggregation. When the particle size is in the range of 0.5-3.0μm,the CaZrO3
powder has a good sintering activity and may be used as a refractory.
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