The effect of TiO2 addition on microstructure and electrical properties of SnO2 varistors prepared from nanomaterials

被引：8

作者：

Shahraki, Mohammad Maleki ^{[1
]}

Bahrevar, Mohammad Ali ^{[1
]}

Mirghafourian, Seyed Mohammad Sadegh ^{[2
]}

机构：

[1] Mat & Energy Res Ctr, Semicond Dept, Karaj, Iran

[2] Pars Elect Transmiss Equipment Co, Esfahan, Iran

来源：

CERAMICS INTERNATIONAL | 2015年 / 41卷 / 05期

关键词：

Varistor; SnO2; TiO2; addition; Breakdown region; Upturn region; SNO2-BASED VARISTORS; OXIDE VARISTORS; CERAMICS; BEHAVIOR; KINETICS; SYSTEM; TA2O5; ZNO;

D O I：

10.1016/j.ceramint.2015.01.146

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effects of various amounts of TiO2 in the composition of SnO2-based varistors made from nano-sized materials on microstructure and electrical properties have been investigated. Titanium oxide acts as both a densifier and grain growth enhancer resulting in relative densities in the range of 96-99%. The addition of TiO2 from 0 to 3 mol% has changed the average grain size from 1.8 to 5 mu m. The introduction of TiO2 causes precipitation of Ta2O2.2 phase on the sample surfaces. The lowest breakdown field, 2 kV/cm, has been observed for the sample containing 0.75 mol% of TiO2, and the best surge-withstand parameters (residual voltage ratio, 2.4, withstanding surge current density, 5 kA/cm(2)) have been observed for the sample with 0.25 mol% TiO2. Larger amounts of TiO2 have had an adverse effect on the surge-withstand capability due to the loss of homogeneity in the samples caused by tantalum transpiration. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：6920 / 6924

页数：5

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