添加B_2O_3对0.7CaTiO_3-0.3NdAlO_3陶瓷烧结及其介电性能的影响

Effect of Adding B_2O_3 into 0.7CaTiO_3-0.3NdAlO_3 Ceramics on its Sintering and Performance

0.7CaTiO3-0.3NdAlO3(以下简称为CTNA30)是应用广泛但烧结温度较高的微波介质陶瓷.本文通过添加不同量的B2O3来降低CTNA30陶瓷的烧成温度,并用XRD,SEM和矢量网络仪分析等表征方法,确定了B2O3的添加量对CTNA30烧结温度、物相组成、微观结构和介电参数的影响.添加B2O3可以显著地促进CTNA30陶瓷体的烧结,其中添加2%B2O3的CTNA30陶瓷,烧结温度可降到1 300℃,介电常数εr为49.99,品质因数Qf为57862GHz,频率温度系数τf为5.39×10-6/℃.

0.7CaTiO3-0.3NdAlO3 （CTNA30）ceramics is a kind of widely used microwave dielectric ce-ramics with high sintering temperature.In this article,various contents of B2 O3 were introduced into CT-NA 30 to decrease its sintering temperature.Then,the influences of B2 O3 content on the sintering temper-ature,morphology,microstructure and microwave dielectric properties of CTNA30 were investigated with x-ray diffract meter （XRD）,environmental scanning electron microscope （ESEM）and vector network ana-lyzer.The results showed that ceramics could be sintered more easily when doped with B2 O3 .Moreover, the sintering temperature could be decreased to 1 300 ℃ from 1 500 ℃ when doped with 2wt% B2 O3 and the correspondingεr reached the maximum 49.99,Qf about 57 862 GHz,which decreased with the increase of doping level,andτf was about 5.39×10^-6∕℃.