制备工艺对钛酸钡基无铅高压陶瓷电容器材料性能的影响

以BaTiO3为基料,加入SrTiO3,CaCO3,Bi2O3·3TiO2等制备了(1-z)Ba1-x-ySrxCayTiO3·z(Bi2O3·3TiO2)系无铅高压陶瓷电容器材料,研究了制备工艺对材料性能的影响.结果表明,在保温时间一定的情况下,瓷料的最佳烧结温度取决于组分中Bi2O3·3TiO2含量,且烧结温度随着Bi2O3·3TiO2的含量的增加而降低；在BaTiO3中加入30％SrTiO3,10％ CaCO3和3％ Bi2O3·3TiO2时(均为摩尔分数),瓷料的最佳烧结温度为1240℃,其εr=3802,tgδ=4.2×10-3,Eb=9.2 kV·mm-1；并且在研究介温性能时,居里温度降低到35℃左右,拓宽了介电峰；当Bi2O3·3TiO2的含量增加到4％时,瓷料的最佳烧结温度为1220℃；在合理的烧结温度范围内,低温烧结和慢速升温将有利于细晶的致密化,从而改善高压陶瓷电容器的综合性能.

Effect of Preparation Technique on BaTiO3-Base Lead-Free High Voltage Ceramic Capacitor Materials

The SrTiO3,CaCO3 and Bi2O3 · 3TiO2 were added to the BaTiO3-based lead-free high voltage ceramic capacitor materials.And the formula(1-z)(Ba1-x-ySrxCay)TiO3 · z(Bi2O3 · 3Ti03) was gotten,the effect of preparation technology on the dielectric properties were investigated.The results showed that,in certain holding time,the best sintering temperature depended on the content of Bi2O3 · 3TiO2,and it reduced with Bi2O3 · 3TiO2 increasing.The dielectric properties of BaTiO3-based materials with 30%SrTiO3,10%CaCO3 and 3% Bi2O3 · 3TiO2(mole fraction) were: εr =3802,tgδ=4.2×10-3,Eb=9.2 kV · mm-1,the best sintering temperature was 1 240 ℃,and the Curie temperature decreased to 35 ℃,the broadening of the dielectric peaks.When the Bi2O3 · 3TiO2 content increased to 4%,the best sintering temperature was 1220 ℃.In the reasonable temperature range of sintering,low-temperature sintering and rising temperature slowly would benefit the densification of fine grains,thus improving the comprehensive performance of high voltage ceramic capacitor materials.