Densification and enhancement of the grain boundary conductivity of gadolinium-doped barium cerate by ultra fast flash grain welding

被引:71
作者
Muccillo, R. [1 ]
Muccillo, E. N. S. [1 ]
Kleitz, M. [2 ]
机构
[1] Univ Sao Paulo, Ctr Sci & Technol, Mat Energy & Nucl Res Inst, Travessa R 400,Cidade Univ, BR-05508900 Sao Paulo, Brazil
[2] Polytech Inst Grenoble INPG, LEPMI, F-38402 St Martin Dheres, France
基金
巴西圣保罗研究基金会;
关键词
Sintering; Grain boundaries; Impedance; Flash grain welding; YTTRIA-STABILIZED ZIRCONIA; SINTERING RATE; FUEL-CELL; SOLID ELECTROLYTES; ELECTRICAL-FIELDS; BACEO3; GROWTH; 3Y-TZP; SIZE;
D O I
10.1016/j.jeurceramsoc.2012.01.032
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
Doped barium cerate is a promising solid electrolyte for intermediate temperature fuel cells as a protonic conductor. However, it is difficult to sinter it to high density at a reasonable temperature. Moreover, it presents a high grain boundary resistivity at intermediate temperatures. Flash grain welding was applied to compacted samples, starting from a temperature of 910 degrees C and applying, for a short time, an ac electric polarization of 40 V, 1000 Hz. At that frequency, the resulting current flows through the grain boundaries promoting a welding via a local Joule heating. A large decrease of the grain boundary resistivity was observed by impedance spectroscopy. Scanning electron microscopy observations of polished and etched surfaces revealed highly sintered regions. Attempts were also made to combine flash grain welding with conventional sintering. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2311 / 2316
页数:6
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