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采用新型冷冻胶凝陶瓷成型技术制备高性能Si_3N_4/BAS复相陶瓷透波材料,对Si_3N_4/BAS复相陶瓷材料烧结体成分、力学性能、微观形貌、电性能及抗热震性等进行研究。结果表明:坯体成型收缩率小于1%,在温度升到1 300℃高温时,Si_3N_4/BAS复相陶瓷烧结体弯曲强度280 MPa,弹性模量为90 GPa,介电常数变化率仅为6%。该复相陶瓷材料具有良好的抗热震性能及可加工性,BAS陶瓷玻璃相高温高黏度特性对Si_3N_4/BAS复相陶瓷材料抗热震是一种热应力缓释方式。
A novel high-performance Si_3N_4 / BAS multi-phase ceramic transparent material was prepared by a novel freeze gelled ceramic forming technique to study the composition, mechanical properties, micro-morphology, electrical properties and thermal shock resistance of the sintered Si_3N_4 / BAS composite ceramics . The results show that the shrinkage of the green body is less than 1%. The flexural strength of the Si 3 N 4 / BAS composite ceramics sintered at 280 ℃, the elastic modulus of 90 GPa and the dielectric constant change rate of 6 %. The multi-phase ceramic material has good thermal shock resistance and workability. The high temperature and high viscosity of BAS ceramic glass phase is a thermal stress relief method for the thermal shock resistance of the Si_3N_4 / BAS composite ceramic material.