关键词: 超声波, 二氧化钛, 直接沉淀, 均相沉淀

Abstract:

At present, ultrasonic treatment technology has been extensively studied in the preparation of nanon/micron materials.In this paper, liquid precipitation corroborated by ultrasonic treatment for ultramicro TiO₂ powder preparation was studied, and the purpose was to find the influence of ultrasonic treatment on as-prepared TiO₂ powder characteristics.Two processes of direct precipitation and homogeneous precipitation were investigated, and ultrasonic treatment was added in different periods of these two preparation processes respectively.Comparison and analysis of the TiO₂ samples in terms of grain size and particle size indicated that ultrasonic treatment could decrease the size of TiO₂ grain and particle, improve its dispersion for the homogeneous precipitation method. But in the process of direct precipitation, ultrasonic treatment would promote the formation of TiO₂ aggregate, and bring forth some adverse effects on TiO₂ powder’s characteristics.

Key words: 超声波, 二氧化钛, 直接沉淀, 均相沉淀