摘要
以ZnO为基添加Al2O3、TiO2和MgO制备了导电陶瓷;研究了TiO2、MgO掺杂含量对ZnO陶瓷相对密度、电阻率和电阻温度系数的影响;测试分析了ZnO导电陶瓷在小电流和脉冲大电流下的伏安特性。结果表明,掺Ti有利于致密烧结,TiO2含量为0.6%(质量分数)时,样品相对密度为96%,室温小电流下测试其电阻率为8.14Ω.cm;添加适量MgO能降低电阻率且可改善电阻温度系数,MgO含量为0.4%(质量分数)时,小电流电阻率为5.67Ω.cm;室温小电流下样品伏安特性接近线性,在脉冲大电流下呈现一定非线性特性。
Al2O3 ,TiO2 and MgO doped ZnO-based conductive ceramics were prepared. The effects of TiO,, MgO additive contents on the relative density,resistivity,temperature coefficient of ZnO conductive ceramics were investigated. U-I characteristic of ZnO conductive ceramics under low current and pulse current were analysed. The results show that Ti additive promotes sintering,when TiO, content is 0.6wt% ,relative density and resis- tivity under room temperature and low current is 96%, 8. 14Ω· cm respectively. Resistivity decreases when doped moderate amount of MgO.when MgO content is 0.4wt%,the minimum resistivity is 5.6Ω· cm. Resistance temperature coefficient can be improved with moderate amount of MgO. The obtained ZnO eonductive ceramics have linear U-1 characteristic under low current,but show nonlinearity under surge current.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第9期1455-1457,1460,共4页
Journal of Functional Materials
关键词
ZnO导电陶瓷
电阻率
脉冲电流测试
ZnO conductive ceramics
resistivity
surge current testing
