ZnO压敏陶瓷的微波烧结

Microwave Sintering of ZnO Varistor Ceramics

对用纳米粉体制备的ZnO压敏生坯进行了微波烧结，通过XRD、SEM分析和电性能测试，与普通烧结比较，微波烧结可使ZnO压敏材料快速成瓷，显著缩短烧结时间；在相同晶粒尺寸下，微波烧结温度更低，瓷体更致密；并能获得较好电性能．微波烧结为ZnO压敏陶瓷材料制备提供了一条新的、高效节能的途径．

ZnO nanopowders prepared by the Sol-Gel method were sintered by microwave. The microstructure of the material was analysed by XRD and SEM. The I - V properties of varistor weremeasured by a stabilized dc power source. Compared with the conventional sintering, microwavesintering promptes grain growth and shortenes sintering time. When grain sizes are the same, thetemperature of microwave sintering can be lower than that of conventional sinering. Microwavesintering has the ability to enhance the density of ZnO varistor ceramic and to obtain good electricpropertises. Hence, microwave sintering is a newly effective method for processing ZnO varistorceramic .