纳米TiO2粉体制备过程中结晶度的控制

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采用醇盐水解法,控制醇盐和水的摩尔比和水解的速度等条件,可以制备出5~20um左右的纳米氧化钛粉体.用乙醇洗涤以后,沉淀物转变为无定形;而在乙醇洗涤以前用醋酸处理过的粉体为晶体结构(锐钛矿结构).不同的处理方法对二氧化钛粉体团聚的影响不同,XRD、BET、DTA-TG和TEM的研究结果表明,在一定的条件下,经醋酸处理过的粉体表现出优良的性能,晶粒尺寸小,团聚度低,而且失重小,在较低的温度下就进行由锐钛矿向金红石的转变.粉体的这些性能直接影响到材料的烧结特性.
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