Pb(Zn_(1/3)Nb_(2/3))O_3基陶瓷预合成和烧结工艺的研究  

Study on the Process of Preparation and Sintering for PZN-Based Ceramics Prepared by Modified Two-Step Method

作　　者：云斯宁[1] 王晓莉[1] 

机构地区：[1]西安交通大学理学院,西安710049

出　　处：《硅酸盐通报》2005年第2期3-7,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金资助项目(50272052).

摘　　要：基于Swartz and Shrout的二次合成法,采用改进的两步法,将部分原料预合成,一次烧结合成具有100%钙钛矿结构的75Pb(Zn_(1/3)Nb_(2/3))O_3-10PbTiO_3-15BaTiO_3固溶体陶瓷。首先一次性称量PbO,然后和ZnNb_2O_6混合,在660～800℃预合成,将预合成产物粉碎后再与TiO_2和BaCO_3按化学计量称量,充分混合后,在1060～1140℃保温1～2h烧结成陶瓷试样。实验结果表明:改进的两步法工艺能够将预合成温度降为660℃,烧结温度能被拓宽到80℃获得100%钙钛矿结构的固溶体陶瓷。不同于传统的预合成和烧结,改进的两步法工艺简单、有效,在预合成阶段没有形成钙钛矿相,烧结阶段陶瓷的成瓷和致密化同时进行,完成了中间相向钙钛矿相的转变,获得了介电性能优良的陶瓷试样。Based on the columbite route proposed by Swartz and Shrout, pure perovskite 75Pb(Zn1/3Nb2/3)O3-10PbTiO3-15BaTiO3 solid-solution ceramics was synthesized by the modified two-step method. The ZnNb2O6 and PbO were ball milled and then prereacted at 660～800℃for 1～2h. The prereacted mixture was wet mixed with the corresponding amounts of TiO2 and BaCO3 powders by the ratio 75Pb(Zn1/3Nb2/3)O3-10PbTiO3-15BaTiO3 (75:10:15), and ball milled and dried again. Then the samples were sintered in a double sealed Al2O3 crucible at 1060～1140℃for 2h. The results show that the presintering temperature can be decreased, the sintering temperature can be broadened. Unlike traditional calcination and sintering, there is no perovskite phase among prereaction powders synthesized at 660～800℃, formation and densification of the ceramics synthesized by the modified two-step method are proceeded simultaneously and the transformation from transition phase to perovskite phase is finished at 1060～1140℃. Comparing with the columbite route, the processing is simplified and effective, the dielectric properties of the sintered samples are better in the modified method.

关 键 词：PB(ZN1/3NB2/3)O3 电子陶瓷 烧结工艺 合成工艺 铌锌酸铝 

分 类 号：TQ174.754[化学工程—陶瓷工业]