Current-induced abnormal and oriented grain growth in corundum upon flash sintering

被引：47
作者：
Biesuz, Mattia [1 ]
Sglavo, Vincenzo M. [1 ,2 ]
机构：
[1] Univ Trento, Dept Ind Engn, Via Sommar 9, I-38123 Trento, Italy
[2] INSTM Res Unit, Via G Giusti 9, I-50121 Florence, Italy
来源：
SCRIPTA MATERIALIA | 2018年 / 150卷
关键词：
Flash sintering; Alumina; Grain growth; E-field; F-centers; YTTRIA-STABILIZED ZIRCONIA; THERMAL RUNAWAY; CUBIC ZIRCONIA; ALUMINA; PHOTOEMISSION;
D O I：
10.1016/j.scriptamat.2018.03.004
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
An electrical current upon flash sintering experiments modifies the defect chemistry of corundum and causes the formation of color centers (F-centers), consisting of discharged oxygen vacancies. This phenomenon interacts with the diffusion kinetics in the anodic region and promotes abnormal growth of some grains which reach several hundreds of micrometers in just few minutes, the grains being strongly oriented orthogonally to the current flow. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：82 / 86
页数：5
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