Low Cost Sol-Gel Processing of Titanate Electronic Ceramic Powders

摘要

Sol-gel processing of ceramic powders has been utilized because of the advantagesof the low processing temperatures, high purity products, homogeneous mixing, and ease of compositional doping. Typical sol-gel powder processing of multicomponent gels involves metal alkoxide-alkoxide condensation reactions where the precursor alkoxides can be very expensive. A simple and straight forward sol-gel method has been developed which maintains all of the advantages of typical sol-gel powder processing with less expensive precursors. The process is very adaptable to many ceramic systems and has so far been applied to the formation of PTC BaTiO3, BaO.66SrO.34TiO3, and PZT. The resultant powders are formed at low calcining temperatures, are easily doped, offer control of microstructure, and have a fine particle size. These powder have been characterized using XRD, BET, and thermal analysis and sintered parts have been characterized using SEM. (AN).