无机材料学报2021，Vol.36Issue(5)：535-540,6.DOI:10.15541/jim20200211
添加BaTiO3的热压烧结Si3N4陶瓷的力学和介电性能
Mechanical and Dielectric Properties of Hot-pressed Si3N4 Ceramics with BaTiO3 Addition
摘要
Abstract
Si3N4 ceramics with improved and tailorable dielectric constant are desirable for microwave dielectric substrate application in harsh environment.Effect of BaTiO3 addition on the mechanical and dielectric properties of the hot-pressed Si3N4 ceramics with A12O3 and Nd2O3 as sintering additives were investigated.Relative density,flexural strength and Vickers'hardness of Si3N4 ceramics all decreased,while indentation fracture toughness increased monotonically with the increase of BaTiO3 content.Flexural strength of Si3N4 ceramics was higher than 600 MPa and dielectric constant of Si3N4 ceramics increased to 9.26-11.50 when 5wt％-20wt％of BaTiO3 was added.The dielectric loss was at the level of 10-3.The improvement of dielectric constant was attributed to the formation of TiN during hot pressing,as crystalline BaTiO3 was not detected in the sintered samples.These findings can make a significant contribution to the new applications of Si3N4 ceramics.关键词
氮化硅/断裂韧性/抗弯强度/介电常数/热压烧结Key words
Si3N4/fracture toughness/flexural strength/dielectric constant/hot pressing分类
化学化工引用本文复制引用
梁汉琴,尹金伟,左开慧,夏咏锋,姚冬旭,曾宇平..添加BaTiO3的热压烧结Si3N4陶瓷的力学和介电性能[J].无机材料学报,2021,36(5):535-540,6.基金项目
National Natural Science Foundation of China(51902327) （51902327）
