采用传统电子陶瓷工艺制备了TiO_2-Co_3O_4-Cr_2O_3-Ni_2O_3-MnO掺杂的SnO_2-Sb_2O_3系压敏陶瓷材料.研究了MnO掺杂对SnO_2-Sb_2O_3系压敏陶瓷材料的致密化、小电流区非线性特性及脉冲电流耐受特性的影响.实验发现,少量的MnO掺杂可以改善材料的电压电流非线性特性和耐脉冲电流能力.但是当MnO的添加量多于0.06 mol%时,样品的非线性系数会减小,漏电流会升高.采用Mn(NO_3)_2水溶液作为MnO源能使Mn元素更均匀分布,比采用MnCO_3粉体获得的样品性能更好.当Mn(NO_3)_2添加量为0.06 mol%～0.1 mol%时,获得了电性能接近实际应用要求的产品,其非线性系数介于30～50,压敏电压V_(1mA)介于330～350 V/mm,并且能耐受峰值电流达1.5 kA/cm~2的8/20 μs波脉冲电流.
SnO_2-Sb_2O_3 based varistor ceramic materials doped with TiO_2, Co_3O_4, Cr_2O_3, Ni_2O_3, and MnO were fabricated by conventional electronic ceramic process. The influence of MnO on the densification, low current area V-I nonlinear characteristic and withstanding surge current capability were investigated. It was found that a small amount of MnO addition can improve nonlinear and surge current test performances. When the content of MnO is more than 0.06%, the nonlinear coefficient decreases and the leakage current increases. For better distribution of Mn in the material, Mn(NO_3)_2 aqueous solution is preferable to MnCO_3 as the precursor of MnO. The obtained SnO_2-Sb_2O_3 based varistor samples with 0.06～0.1mol% Mn(NO_3)_2 show promising varistor behavior with nonlinear coefficient (α) of 30～50, breakdown electric filed of about 330～350 V/mm, and withstanding peak current of 1.5 kA/cm~2 of 8/20 μs wave surge.
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