Preparation and Characterization of High Purity Submicron Refractory Oxides and Mixed Oxides from Alkoxides.

摘要

A method was developed to prepare high purite,highly uniform,very reactive,small,under 100A crystallite size ceramic powders. The method consists of preparing a water sensitive organo-metallic compound,preferably an alkoxide,and decomposing it by hydrolysis. The hydroxide is then washed using high purity water or alcohol,dried,ball milled,and finally calcined at 550C. By varying the treatment of the hydroxide,two different types of powders, A and B,were obtained. Powder A is suited for hot pressing consolidation,and pwder B for cold pressing and sintering. The method was specifically developed for the large scale preparation of zirconium oxide containing 6.5mole % yttrium oxide (Zyttrite). However, a similar process was successfully applied o other ceramic materials such as ferrites,and PLZT,lead lanthanum zirconate titanate. In conjunction with development of the production method,the properties of both type A and B Zyttrite were studied to determine which were important to its capacity for sintering. (Author)