SnO_2吸附纳米ZrO_2粉料制备及对BTS微波陶瓷改性的研究

Preparation of ZrO_2/SnO_2 Powder and Its Role in Modification of BTS Microwave Ceramics

以SnO_2和ZrOCl_2?8H_2O为原料,用均相共沉淀法制备SnO_2吸附纳米ZrO_2(ZrO_2/SnO_2)粉料;再以ZrO_2/SnO_2、BaCO_3、TiO_2和Sm_2O_3为原料,用固相法制作BaSm_2Ti_4O_(12)(BTS)陶瓷。SEM和EDS分析表明,制备的粉料是SnO2吸附纳米ZrO_2,ZrO_2粒径约为25 nm。BTS陶瓷XRD和SEM测试证明,主晶相是BaSm_2Ti_4O_(12),属钨青铜型结构;改性后陶瓷晶粒发育良好,分布均匀,气孔少,添加ZrO_2/SnO_2粉料能促进烧结、降低烧结温度。陶瓷介电性能测量表明,添加ZrO_2/SnO_2粉料能改善微波介电性能。当添加1wt.%ZrO_2/SnO_2粉料和1220℃烧结温度时,获得了εr为70,τf为-3.3×10^(-6)/℃,Q值为1890(3GHz)的微波陶瓷。

SnO2 powder adsorbed with nano ZrO2 （ZrO2/SnO2） was prepared with ZrOCl2？8H2O and ZrO2 as raw materials by homogeneous precipitation method. Then, BaSm2Ti4O12 ceramics were obtained with ZrO2/SnO2 powder, BaCO3, TiO2 and Sm2O3 as raw materials by solid state reaction method. SEM and EDS analysis proved： ZrO2/SnO2 powder was the composite of SnO2 adsorbed with nano ZrO2 sized 25 nm. XRD and SEM analysis indicated that the main crystal phase of the doped BTS ceramic was BaSm2Ti4O12 of tungsten bronze. The modifed ceramics exhibited good grain growth, uniform grain size distribution, and less porosity. Adding ZrO2/SnO2 powder could promote the sintering and lower the sintering temperature. The measurements of the dielectric properties showed that adding ZrO2/SnO2 powder could improve the microwave dielectric properties. When doped with 1wt.% ZrO2/SnO2 powder and sintered at 1220 ℃, the microwave dielectric ceramic with the Q value of 1890 （3 GHz）, the εr of 70, and the τf of -3.3 × 10-6 /℃ was obtained.