分别采用电热和微波烧结法制备了(Zr_0.8Sn_0.2)TiO_4(ZST)微波介质陶瓷,研究了不同方法中烧结工艺制度对介质陶瓷材料密度、微观结构、相组成和微波介电性能的影响.结果表明:与电热烧结相比,在所得材料密度近似的情况下,微波烧结能降低烧结温度约70 ℃、缩短烧结时间2.5 h,所获材料密度分布的标准差大大减小;微波烧结所得材料的晶粒尺寸均匀、结构致密;材料的介电常数和品质因数随着微波烧结温度的提高而增大,对应数值分别比传统烧结方式提高17.5%和14.3%左右.并对微波烧结介质陶瓷的致密化机理以及性能进行了较为系统的理论分析.
Microwave sintering and electrical-thermal sintering techniques were used to prepare the (Zr_0.8Sn_0.2)TiO_4(ZST) ceramics whose density, component, microstructure and dielectric performance were characterized by Archimedes method, X-ray diffraction (XRD), scanning electron microscopy (SEM) and HP8720ES network analyzer, etc. The results show that the microwave sintering method can decrease the sintering temperature by about 70 ℃ and the sintering time by about 2.5 h and can enhance the densification. The value of er and Q of ZST increase with the increasing of sintering temperature, and the corresponded value increases by 17.5% and 14.3% respectively, compared with electrical-thermal sintering. The densification mechanism and performance were analyzed more systematically in theory.
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