Nd2O3对氧化锌压敏阀片压敏电位梯度与显微组织的影响

研究了微量Nd2O3添加剂对氧化锌压敏阀片的压敏电位梯度的影响，并对其微观组织进行了分析研究，从理论上探讨了Nd2O3影响氧化锌压敏阀片压敏电位梯度与组织的机理。研究结果表明，在0m01％～0．04mol％成分范围内，随着Nd2O3含量的增加，氧化锌压敏阀片的压敏电位梯度明显提高；当Nd2O3含量超过0．04mol%时，随其含量的增加，氧化锌压敏阀片的压敏电位梯度又呈降低趋势。其原因是Nd2O3加入到氧化锌压敏阀片中，使晶粒尺寸减小所致。

Influence of Nd2O3 on Voltage and Microstructure of ZnO Varistor Materials

The effect of Nd2O3 on voltage and microstructure of ZnO varistor was studied, and a theoretical analysis of the mechanism of the effect was conducted. The results show that the voltage of ZnO varistor increases with the increase of Nd2O3 content in the range of 0 mol%~0.04 mol%. But when the content of Nd2O3 is more than 0.04 mol%, the voltage of ZnO varistor decreases with the increase of the content. The microstructure analysis indicates that the minimal additive exists in ZnO grain boundary in the form of a new compound and hinders the movement of grain boundary, which reduces the size of ZnO grain size and makes the grain more uniform, and as a result, Nd2O3 improve the voltage of the varistor greatly.