Influence of pre-sintering on the reactive flash sintering of high-entropy rare earth zirconate ceramics

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-10-14 DOI:10.1016/j.jeurceramsoc.2025.117901

Xinghua Su , Hui Zeng , Yangliu Tian , Xiao Deng , Qiang Tian , Chenqi Wang , Fanqing Liao

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引用次数: 0

Abstract

The influence of the pre-sintering on the reactive flash sintering of high-entropy (La_0.2Nd_0.2Sm_0.2Eu_0.2Gd_0.2)₂Zr₂O₇ ceramics was studied for the first time. The flash temperature was decreased by increasing the pre-sintering temperature. Moreover, the pre-sintering temperature had an influence on the grain size and bulk density of the flash sintered sample. Furthermore, the pre-sintering could effectively avoid the localization of current coupled with hot spot formation and crack formation, which leaded to “safe” reactive flash sintering. In addition, the crystal structure, grain size, and the bulk density of the flash sintered sample correlated with the imposed current limit. The resultant high-entropy ceramics exhibited superior hardness, fracture toughness, and aqueous durability, which is a promising immobilization material for high-level radioactive waste. The pre-sintering was proved to be an alternative option to regulate the reactive flash sintering behavior and microstructure of sample.

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预烧结对高熵稀土锆酸盐陶瓷反应闪烧的影响

首次研究了预烧结对高熵（La0.2Nd0.2Sm0.2Eu0.2Gd0.2）2Zr2O7陶瓷反应闪速烧结的影响。提高预烧结温度可以降低闪蒸温度。此外，预烧结温度对闪蒸烧结样品的晶粒尺寸和容重也有影响。此外，预烧结可以有效避免电流局部化以及热点和裂纹的形成，从而实现“安全”的反应闪速烧结。此外，闪蒸烧结样品的晶体结构、晶粒尺寸和堆积密度与施加的电流限制相关。所得的高熵陶瓷具有优异的硬度、断裂韧性和水性耐久性，是一种很有前途的高放射性废物固定化材料。预烧结是调节反应闪烧行为和样品微观结构的一种可选方法。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.