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在水解－沉淀法制备纳米ＴｉＯ２粉体的过程中,使用不同的沉淀剂获得了晶相不同的纳米ＴｉＯ２粉体;使用混合沉淀剂,通过控制沉淀剂的比例,制备了晶相组成(金红石与锐钛矿比例)不同的纳米ＴｉＯ２多晶粉体;采用相同的粉体制备工艺,不同的后续处理工艺,探讨了锐钛矿向金红石转变的相变温度．经分析研究后认为,水解－沉淀法制备的纳米ＴｉＯ２粉体中的锐钛矿向金红石转变的温度为５００~８００℃．完全转变的温度在８００℃以上;纳米ＴｉＯ２多晶粉体的晶相组成不仅与沉淀剂的种类、混合沉淀剂中沉淀剂的比例和粉体的煅烧温度有关,而且与粉体的后续处理工艺和粉体表面界面相的稳定性有关．
In the process of preparation of nano-TiO2 powder by hydrolytic-precipitation method, different TiO2 precipitates were used to obtain nano-TiO2 powders with different crystal phases. The mixed precipitants were used to control the ratio of precipitants. Anatase to anatase to anatase to anatase to anatase to anatase to anatase to anatase to anatase to anatase to anatase to anatase to anatase to anatase. After analysis and research, it is considered that the transition temperature of anatase to rutile in nano-TiO2 powder prepared by hydrolysis-precipitation is 500-800 ℃. Completely changing the temperature above 800 ℃; the crystalline phase composition of the nano-TiO2 polycrystalline powder is not only related to the type of precipitating agent, the ratio of the precipitating agent in the mixed precipitating agent and the calcining temperature of the powder, but also to the subsequent processing of the powder And the stability of the powder surface interface phase.