Shell-like structure to limit further densification formed during flash sintering under alternative current electric field for 8 mol %Y2O3-doped ZrO2

被引:5
作者
Seko, Mikito [1 ]
Hattori, Kotaro [1 ]
Ishino, Yuki [1 ]
Kodaira, Ayu [1 ]
Tokunaga, Tomoharu [1 ]
Yamamoto, Takahisa [1 ]
机构
[1] Nagoya Univ, Dept Mat Design Innovat Engn, Furo cho,Chikusa ku, Nagoya 4648603, Japan
基金
日本科学技术振兴机构;
关键词
Flash sintering; SCF; 8YSZ; Zirconia; FAST sintering; ZIRCONIA;
D O I
10.2109/jcersj2.22109
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
A phenomenon often appears that the final achieved density is limited during conventional flash sintering even under alternative current electric field. By observing the cross-sectional microstructure of the flash sintered 8 mol %Y2O3-doped ZrO2 at this state, we found that a thin surface portion with near full density surrounds a porous inside with lower density. The densified thin surface portion is shell-like structure covering a whole of the sintered compact. The formation of this characteristic shell-like structure in the early stage of flash sintering greatly restricts subsequent densification of porous inside. In order to suppress the formation of the shell that inhibit densification, a technique of controlling a steep power spike at a flash event must be necessary to be appropriately transitioned. (c) 2022 The Ceramic Society of Japan. All rights reserved.
引用
收藏
页码:895 / 898
页数:4
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