富氧气氛烧结对SnO<sub>2</sub>压敏电阻微观结构与电学性能的影响

富氧气氛烧结对SnO₂压敏电阻微观结构与电学性能的影响

摘要: 分别在空气气氛和富氧气氛（氧气体积分数分别为30%，40%，50%）下烧结制备SnO₂压敏电阻，研究了烧结气氛中氧气含量对SnO₂压敏电阻微观结构和电学性能的影响。结果表明：与空气气氛相比，在富氧气氛中烧结的压敏电阻的物相组成与晶粒尺寸相近，气孔更少，致密性更好；随着富氧气氛中氧气含量的增多，压敏电阻的电学性能提高，尤其在氧气体积分数为50%时，压敏电阻的非线性系数提高了46.9%，电压梯度提高了45.9%，泄漏电流降低了30.0%。

Abstract: SnO₂ varistors were sintered in air atmosphere and oxygen-enriched atmosphere (oxygen volume fractions of 30%, 40%, and 50%, respectively), and the effects of oxygen content in sintering atmosphere on microstructure and electrical properties of SnO₂ varistors were studied. The results show that the phase composition and grain size of the varistor sintered in the oxygen-riched atmosphere were similar to those sintered in the air atmosphere, and the varistor had fewer pores and better compactness. With increasing oxygen content in the oxygen-riched atmosphere, the electrical performance of the varistor increased, especially when the oxygen volume fraction was 50%, the nonlinear coefficient of the varistor increased by 46.9%, the voltage gradient increased by 45.9%, and leakage current was reduced by 30.0%.