Phase-boundary assisted flash sintering of Al2O3-TiO2 nanocomposites

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-10-06 DOI:10.1016/j.actamat.2025.121612

Shiyu Zhou , Chao Shen , David Estrella , Alfredo Sanjuan , Huan Li , Yifan Zhang , Chang Liu , Danny Hermawan , Ke Xu , Zhongyujie Liu , Benson Kunhung Tsai , Jialong Huang , Xuanyu Sheng , Abhijeet Choudhury , Yang Chen , R. Edwin García , Xinghang Zhang , Haiyan Wang

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引用次数: 0

Abstract

Al₂O₃ is inherently challenging to flash sinter due to its highly insulating nature. In contrast, TiO₂ can be flash sintered readily due to its better electrical and ionic conductivity at elevated temperatures than those of Al₂O₃. In this study, two-phase composites of Al₂O₃-TiO₂ with various molar ratios (i.e., 34 mol.% Al₂O₃/66 mol.% TiO₂ and 20 mol.% Al₂O₃/80 mol.% TiO₂) have been successfully processed by flash sintering and a systematic flash sintering map has been constructed to explore the relationship between electric field (ranging from 300 to 1600 V/cm) and the flash sintering temperature in Al₂O₃-TiO₂ composites. The map clearly demonstrates that the flash sintering temperature of composites decreases with increasing electric field or higher TiO₂ molar ratio. The potential mechanisms of phase boundary assisted flash sintering are discussed. This study confirms that the appropriate design of two-phase composites can prominently promote the flash sintering of insulating ceramic materials.

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Al2O3-TiO2纳米复合材料的相界辅助闪蒸烧结

由于Al2O3的高绝缘性，对闪蒸烧结具有固有的挑战性。相比之下，TiO2在高温下具有比Al2O3更好的电导率和离子导电性，可以很容易地进行闪烧。本研究成功制备了不同摩尔比（34 mol.% Al2O3/66 mol.% TiO2和20 mol.% Al2O3/80 mol.% TiO2）的Al2O3-TiO 2两相复合材料，并构建了系统的闪烧图，探索了Al2O3-TiO 2复合材料中电场（300 ~ 1,600 V/cm）与闪烧温度之间的关系。该图清楚地表明，复合材料的闪烧温度随着电场的增大或TiO2摩尔比的增大而降低。讨论了相界辅助闪蒸烧结的潜在机理。研究证实了两相复合材料的合理设计能显著促进绝缘陶瓷材料的闪烧。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.