Spark plasma sintering of SnO2 based varistors

被引:5
作者
Shahraki, Mohammad Maleki [1 ]
Chermahini, Mehdi Delshad [2 ]
Abdollahi, Mehdi [2 ]
Irankhah, Reza [3 ]
Mahmoudi, Pezhman [4 ]
Karimi, Asadollah [5 ]
机构
[1] Univ Maragheh, Fac Engn, Dept Mat Engn, Maragheh 5518183111, Iran
[2] Shahrekord Univ, Fac Engn, Dept Mat Engn, Shahrekord, Iran
[3] Mat & Energy Res Ctr, POB 14155-4777, Tehran, Iran
[4] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran 113659466, Iran
[5] Univ Maragheh, Fac Engn, Dept Chem Engn, Maragheh 5518183111, Iran
关键词
SnO2; Varistor; SPS; Post-annealing; Electrical properties; I-V CHARACTERISTICS; ELECTRICAL-PROPERTIES; TIN OXIDE; GRAIN-GROWTH; ZNO; DENSE; CERAMICS; MICROSTRUCTURE; DENSIFICATION; CONTAMINATION;
D O I
10.1016/j.ceramint.2020.05.135
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
In this research, for the first time, SnO2-based varistors were fabricated via spark plasma sintering technique (SPS) and the microstructure and electrical properties of these varistors were investigated. Furthermore, the effect of post-annealing temperature in oxygen atmosphere on electrical properties of the SPSed samples was studied. The SPS process was performed at the sintering temperatures of 600, 650, and 700 degrees C for 15 min with a maximum pressure of 90 MPa under vacuum condition. The SPSed sample which was sintered at 650 degrees C possessed maximum density of 98% and the ultra-fine-grained microstructure with the mean grain size of 380 nm. Surprisingly, all SPSed samples exhibited Ohmic behavior with very low electric resistances. After post-annealing in oxygen atmosphere, Ohmic to non-Ohmic transition was observed in SPSed samples. The oxygen deficiency during the SPS process was responsible for the Ohmic characteristic of SPSed samples. Post-annealing of SPSed samples in the oxygen atmosphere resulted in Schottky barriers formation through oxygen adsorption at grain boundaries. The sample post-annealed at 1050 degrees C presented the best non-Ohmic parameters including high breakdown electric field of 4500 V/cm and the nonlinear coefficient of 13. These electrical parameters are comparable with the conventional-sintered samples which was sintered at 1300 degrees C and its breakdown electric field and nonlinear coefficient were equal to 900 V/cm and 8, respectfully.
引用
收藏
页码:20429 / 20436
页数:8
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