纳米氧化锌压敏陶瓷

Fabrication of Nanometer ZnO Varistors

采用多元掺杂法以纳米级的ZnO为原料制备纳米ZnO压敏陶瓷,通过SEM,TEM,XRD等现代分析方法对其组织结构进行表征,并测量其压敏性能。实验结果表明,压敏陶瓷的粉体平均粒径可达到30nm;压敏电压Vb=462V;漏电流IL=1.2μA;非线性系数α可达到45;而且随着烧结温度的升高,晶粒尺寸逐渐增大,结构逐渐均匀、致密。

In this article , nanometer ZnO varistor ceramic is fabricated by means of several additives together, and through SEM, TEM, XRD, etc. high-tech methods,the structure and properties of nanopowder ZnO varistors are studied. The experimental results indicate that the general grain size of nanopowder is about 30nm, V_b= 462 V, I_L=1.2 μA, α=45. With the increasing in sintering temperature, the grain grows up gradually, there is uniformity and densification in the microstructure.