以熔盐法制备的片状SrBi_2Nb2_O_9晶体为模板剂,采用模板晶粒生长技术和流延法制备了Sr-Bi_2Nb_2O_9织构陶瓷,研究了模板含量对SrBi_2Nb_2O_9织构陶瓷烧结行为、织构度、显微结构的影响.结果表明:模板含量为10 wt%时,1200 ℃保温2 h烧结可获得体积密度最大的SrBi_2Nb_2O_9织构陶瓷,模板含量继续增加,体积密度降低;织构陶瓷的晶粒尺寸随模板含量的增加而逐渐增大,且晶粒取向性生长趋于明显,当模板含量为10 wt%时,织构化SrBi_2Nb_2O_9陶瓷的晶粒取向率f达到最大值,为0.81;织构化陶瓷的压电常数d_(33)达到13 pC/N,高于固相法制备的陶瓷的压电常数.
Textured SrBi_2Nb_2O_9 ceramic was fabricated by templated grain growth and tape casting tech-nique using plated-like SrBi_2Nb_20_9 prepared by molten salt synthesis method as the template particle. The effect of the template particle content on the sintering behavior, texture fraction, microstructures of textured ceramics was investigated. It was found that the maximum of the bulk density of SrBi_2Nb_20_9 tex-tured ceramic sintered at 1200 ℃ for 2 h is at 10 wt% the template particle content, and then the density decreases as the content increasing. With the increasing of the template particle content, the grain size of the SrBi_2Nb_20_9 textured ceramics grows larger and the grain orientation growth becomes obviously. When the template particle content is 10 wt% , the largest Lotgering factor f of 0. 81 for the textured SrBi_2Nb_20_9 ceramics is obtained. The piezoelectric constant d_(33) of the textured ceramic reaches to 13 pC/N, which is higher than that of ceramic prepared by solid solution reaction technique.
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