Current-controlled flash sintering experiments on rutile TiO2: Microstructure and defect structure evolution

Chandan Singh

doi:10.1016/j.jeurceramsoc.2025.117632

2025-06-26

PRE

DOI：10.1016/j.jeurceramsoc.2025.117632

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摘要

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本研究探索了采用50至500 mA/min的电流斜升速率对金红石TiO2进行电流控制闪光烧结。研究发现，在标距长度上微观结构和缺陷分布存在显著异质性，突显了施加电流斜升速率在调控金红石TiO2中氧空位形成中的关键作用。较低的斜升速率导致中区域出现异常晶粒生长和Magnéli相形成，并伴随点缺陷分布的多样性。有限元分析准确预测了闪光烧结温度曲线，考虑了焦耳加热和热失控。然而，主烧结曲线分析低估了与电流斜升速率相关的致密化程度，表明存在无热致密化机制的作用。值得注意的是，电流流产生的氧空位浓度约为仅由热激活预测值的60倍。结果表明，闪光烧结是一种电驱动、非平衡过程，对电参数的精确控制能够实现对缺陷化学、物质传输和微观结构演化的新型调控。

期刊

Journal of the European Ceramic Society

IF:

6.2

论文数:

1.7W

被引数:

5.1W

机构

暂无机构信息

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