Effects of limiting current density and current step rate on microstructure and hardness of flash sintered MgAl2O4 ceramics

被引：0

作者：

Han, Ning ^{[1
]}

Yang, Shoulei ^{[1
,2
]}

Chen, Shuyue ^{[1
]}

Wang, Zhiyi ^{[1
]}

Yang, Mengjie ^{[1
]}

Fan, Lei ^{[1
,2
]}

Guo, Xiaoqing ^{[1
]}

Dai, Yujin ^{[1
]}

Wang, Yidan ^{[1
]}

Chen, Shuangqing ^{[1
]}

Zhang, Zhengkai ^{[1
]}

Zhang, Yun ^{[1
]}

机构：

[1] Zhengzhou Univ Aeronaut, Sch Mat Sci & Engn, Zhengzhou 450046, Peoples R China

[2] Zhengzhou Univ Aeronaut, Henan Key Lab Aeronaut Mat & Applicat Technol, Zhengzhou 450046, Henan, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2025年 / 45卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Current-step; Flash sintering; Microstructure; Hardness; MAGNESIUM ALUMINATE SPINEL; ELECTRIC-FIELD; TEMPERATURE; DISTRIBUTIONS; ZIRCONIA; STAGE;

D O I：

10.1016/j.jeurceramsoc.2024.116982

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：

This study investigates the effects of limiting current density and current step rate on the microstructure and hardness of current-step flash-sintered (CS-FS) disc-shaped MgAl2O4 2 O 4 ceramics. The results indicated that, unlike conventional flash sintering, the temperature of the sample during the current-step flash started at a lower initial value and subsequently increased gradually. Furthermore, the differences in oxygen vacancies between the positive and negative sides of the CS-FS-ed MgAl2O4 2 O 4 ceramics were significantly reduced. This led to the CS-FS samples exhibiting higher relative density, finer grain size, a more uniform microstructure, and increased hardness. The homogeneous microstructure resulted in consistent hardness across both sides of each CS-FS-ed sample. Additionally, as the limiting current density increased, the grain sizes near the positive and negative sides gradually enlarged, while the relative density initially increased before decreasing. A similar trend was observed when the current step rate decreased.

引用

页数：8

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