论文部分内容阅读
微细氧化物的合成是研究高性能陶瓷材料的一个重要环节.微细粒子是指粒径小于1μm的微粒.这种粒子具有一般化合物粒子无可比拟的特殊性质,例如,可以提高超导材料的临界温度;提高催化剂的活性等等.微细粒子的主要制备方法是造粒法.在造粒法中液相法具有设备简单、温度低、便于工业生产等优点,尤其适用于制备微细金属氧化物粉末.近年来,美国、日本及西欧某些国家通过金属烷氧基化合物水解法合成一系列单分散的金属氧化物粉末,其优点是粒子细而均匀、纯度高,但金属烷氧基化合物价昂,而且合成过程必须控制无水条件,因此不宜于工业规模生产.
The synthesis of fine oxides is an important part of the study of high performance ceramic materials.Microscopic particles are particles with a particle size of less than 1μm.The particles have the special properties that the general compound particles have unparalleled, for example, can increase the critical of the superconducting material Temperature, catalyst activity, etc. The main preparation method of the fine particles is the granulation method, the liquid phase method has the advantages of simple equipment, low temperature and easy industrial production, and is especially suitable for preparing the fine metal oxide powder In recent years, a series of monodisperse metal oxide powders have been synthesized by hydrolysis of metal alkoxides in some countries of the United States, Japan and Western Europe. The advantage of this method is that the particles are fine and uniform with high purity, but the metal alkoxide is expensive , And the synthesis process must control the anhydrous conditions, it is not suitable for industrial scale production.