钛酸钡陶瓷制备及介电性能研究

Study on Preparation and Dielectric Properties of Barium Titanate Ceramics

采用钛酸四丁酯和硝酸钡为主要原料的微波辅助草酸盐沉淀法,在最佳的工艺参数下合成晶粒尺寸约为30~50 nm的钛酸钡粉末。再通过对纳米粉体造粒、成型、排胶和烧结等工艺处理制备钛酸钡陶瓷。研究陶瓷的最佳烧结温度与烧结时间,并且讨论其对介电性能的影响规律。利用透射电子显微镜分析粉体的形貌,XRD和扫描电子显微镜分别分析陶瓷的物相和断面形貌。结果表明,利用微波辅助草酸盐沉淀法合成的粉体制备陶瓷的烧结温度为1270℃,烧结时间为3 h。并且其介电常数在室温下可达到2397.6。

Barium titanate( BT) powders with a diameter of 30-50 nm were prepared by microwave assisted oxalate co-precipitation method under the optimum condition using tetrabutyl titanate and barium nitrate as the main raw materials. The barium titanate ceramics can be prepared by pelleting,forming,dumping and sintering for nano-powders. The optimum sintering temperature and time of ceramics and their influence rule for dielectric properties were studied. The morphology of powder was characterized by transmission electron microscopy( TEM),The crystalline phases and fracture surface morphology of ceramics were characterized by XRD and scanning electron microscopy( SEM),respectively. The results show that the optimum sintering condition of ceramics is at 1270 ℃ for 3 h and dielectric constant can reach to 2397. 6 at room temperature.