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以CaCO3和ZrO2为原料,CaCl2为熔剂,在熔盐条件下合成CaZrO3粉体,考察了原料配比、保温时间和煅烧温度对合成过程的影响,通过X射线衍射分析和扫描电子显微镜对合成产物的物相组成和颗粒形貌进行了分析。结果表明,提高CaCO3和熔盐的量有利于合成反应的进行。最佳工艺条件为CaCO3、ZrO2、CaCl2摩尔比为1.2:1.0:1.2,烧成温度和保温时间分别为900℃和3 h。在最佳工艺条件下制备出的CaZrO3粉体粒度为1.0～2.0μm,分散性好,颗粒呈四方体状。以CaCl2为熔盐时,合成CaZrO3的反应机制为"模板生长"和"溶解–析出"两种形式共存。
Abstract：CaZrO3 powders were synthesized by a molten salts method using CaCO3 and ZrO2 as raw materials,and CaCl2 as.The effects of ratio of raw materials,calcining temperature and holding time on the synthesis process were investigated.The phase composition and morphology of the samples were analyzed by X-ray diffraction and scanning electron microscopy as well.The results indicate that the increase of CaCO3 and CaCl2 content can facilitate the synthesis process.CaZrO3 with the superior dispersivity and the grain size of 1–2 μm could be obtained via the control of the mole ratio of raw materials(mole ratio of CaCO3,ZrO2 and CaCl2 was 1.2:1.0:1.2),which were calcined at 900 ℃ for 3h.It was assumed that the synthesis mechanisms of ‘‘template-growth’’ and ‘‘dissolution–precipitation" could coexist during the synthesis process of CaZrO3.
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基本信息:
中图分类号:TQ132.32
引用信息:
[1]任雪潭,滕元成,李鹏.熔盐法合成锆酸钙[J].硅酸盐学报,2013,41(05):691-695.
基金信息:
西南科技大学科研基金(07ZX7128)资助项目
2013-04-23
2013-04-23
2013-04-23