无机材料学报 ›› 2022, Vol. 37 ›› Issue (5): 473-480.DOI: 10.15541/jim20210513
所属专题: 【结构材料】高熵陶瓷
• 综述 • 下一篇
收稿日期:
2021-08-19
修回日期:
2021-10-21
出版日期:
2022-05-20
网络出版日期:
2021-10-21
通讯作者:
王一光, 教授. E-mail: wangyiguang@bit.edu.cn
作者简介:
刘金铃(1983-), 男, 教授. E-mail: liujinling@swjtu.edu.cn;
基金资助:
LIU Jinling1(), LIU Dianguang2, REN Ke3, WANG Yiguang3()
Received:
2021-08-19
Revised:
2021-10-21
Published:
2022-05-20
Online:
2021-10-21
Contact:
WANG Yiguang, professor. E-mail: wangyiguang@bit.edu.cn
About author:
LIU Jinling (1983-), male, professor. E-mail: liujinling@swjtu.edu.cn
Supported by:
摘要:
闪烧是近些年广受关注的一种电场辅助烧结技术。本文介绍了闪烧的起源与发展, 并对闪烧的基本特征进行了分析。在闪烧孕育与引发过程的研究方面, 发现了孕育阶段的非线性电导特征和电化学黑化现象, 提出了氧空位主导的缺陷机制; 在闪烧阶段的快速致密化研究方面, 提出了电场作用导致的缺陷产生和运动会在粉体颗粒间产生库仑力, 有利于烧结前期的致密化过程, 同时发现闪烧致密化过程中还伴随着金属阳离子的快速运动; 在闪烧阶段的晶粒生长和微结构演变方面, 发现了试样温度沿电流方向呈非对称分布, 试样中间位置的晶界迁移率明显提高, 提出电化学缺陷对微观结构有重大影响。基于上述研究成果, 本团队利用电场作用下出现的低温快速传质现象, 发展了陶瓷闪焊技术, 实现了同种陶瓷/陶瓷、陶瓷/金属, 甚至异种陶瓷/陶瓷之间的快速连接; 发展了陶瓷闪烧合成技术, 不仅实现了典型氧化物陶瓷的快速合成, 而且实现了高熵陶瓷和具有共晶形貌的氧化物陶瓷的快速合成; 发展了氧化物陶瓷的电塑性成形技术, 初步实现了氧化锆陶瓷低温低应力下的快速拉伸和弯曲变形。本文最后总结了闪烧机理研究面临的挑战, 并从焦耳热效应和非焦耳热效应两方面展望了闪烧的发展方向, 期望对闪烧技术在国内的发展有所裨益。
中图分类号:
刘金铃, 刘佃光, 任科, 王一光. 氧化物陶瓷闪烧机理及其应用研究进展[J]. 无机材料学报, 2022, 37(5): 473-480.
LIU Jinling, LIU Dianguang, REN Ke, WANG Yiguang. Research Progress on the Flash Sintering Mechanism of Oxide Ceramics and Its Application[J]. Journal of Inorganic Materials, 2022, 37(5): 473-480.
图3 (a)闪烧氧化钇稳定氧化锆陶瓷样品出现的电化学黑化现象和(b)闪烧后样品的电子顺磁共振波谱
Fig. 3 (a) Electrochemical blackening of flash sintered 3YSZ ceramic and (b) EPR result of the flash sintered 3YSZ sample
图5 8YSZ陶瓷试样表面温度在闪烧稳态阶段随位置的变化曲线[15]
Fig. 5 Change of the surface temperature of 8YSZ sample as a function of distance from cathode at the steady stage during the flash sintering[15]
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