摘要
采用传统的固相烧结工艺制备了TiO_2系压敏陶瓷。通过对其晶体结构、表面形貌分析和对样品压敏性能、介电性能的测定,研究了不同CaCO_3含量对TiO_2压敏陶瓷性能的影响。研究发现:在1300℃烧结条件下,掺入0.50 mol%CaCO_3的样品具有非常致密的微观结构,晶粒的均匀性最好;除TiO_2金红石晶相外,还存在着第二相;具有良好的综合电性能,显示出低的压敏电压(E_(1mA)=2.07 V/mm)、高的非线性系数(α=3.35)、最高的介电常数(ε_r=2.60×10~5)和相对低的介电损耗(tanδ=0.23)。
TiO_2 varistor ceramics were prepared by conventional solid state reaction.The surface morphology,crystal structure,varistor properties and dielectric properties of TiO_2 varistor ceramics with different amounts of CaCO_3 sintered at 1300 ℃ were investigated.The results showed that the samples doped with 0.50 mol% CaCO_3 had compact microstructure and homogeneous grains.Minor secondary phases were detected besides the matrix of TiO_2 rutile phase.The optimal composition was obtained by doping with 0.50 mol% CaCO_3,which had the low breakdown voltage of 2.07 V/mm,the high nonlinear coefficient of 3.35,the highest dielectric constant of 2.60×10~5 and the relative low tanδ of 0.23..
出处
《陶瓷学报》
北大核心
2017年第2期212-216,共5页
Journal of Ceramics
基金
国家高技术研究发展计划(863计划
2013AA030801)
国家自然科学基金(51372110
51402144
51302124
51302025)
广东省科技计划(2013B091000001)
山东省自主创新及成果转化专项(2014CGZH0904)
山东省高等学校科技计划项目(J14LA10
J14LA11)
聊城大学研究基金项目(318011301
318011306)
