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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (12): 2136-2145.DOI: 10.16553/j.cnki.issn1000-985x.2025.0141

• 研究论文 • 上一篇    下一篇

微下拉法生长GdAlO3-Al2O3共晶微结构演化机理研究

刘振(), 许锦涛, 朱汕林, 廖灿媛, 胡宏伟, 钟幸原, 钟玖平()   

  1. 中山大学材料学院,深圳 518107
  • 收稿日期:2025-07-07 出版日期:2025-12-20 发布日期:2026-01-04
  • 通信作者: 钟玖平,副教授。E-mail:zhongjp@mail.sysu.edu.cn
  • 作者简介:刘振(1998—),男,福建省人,硕士研究生。E-mail:1484763836@qq.com
  • 基金资助:
    国家自然科学基金(62275276);中山大学大学生创新训练项目(20250061)

Investigation on the Microstructural Evolution Mechanism of GdAlO3-Al2O3 Eutectics Grown by Micro-Pulling-Down Method

LIU Zhen(), XU Jintao, ZHU Shanlin, LIAO Canyuan, HU Hongwei, ZHONG Xingyuan, ZHONG Jiuping()   

  1. School of Materials,Sun Yat-Sen University,Shenzhen 518107,China
  • Received:2025-07-07 Online:2025-12-20 Published:2026-01-04

摘要: GdAlO3(GAP)-Al2O3氧化物共晶材料因具有高抗弯曲强度、优良的高温抗蠕变性能和抗氧化性能,广泛应用于高温结构材料。共晶的微观结构直接影响共晶材料的性能,而定向凝固技术能使共晶材料的微结构组织按一定方向排列,获得具有特定结构的共晶材料。微下拉定向凝固技术用于生长共晶材料,具有温度梯度大、生长速率调控范围广、生长周期短及生长过程可视等优点。本工作采用微下拉法(μ-PD)生长了GAP-Al2O3共晶,通过XRD和SEM对GAP-Al2O3共晶微观结构进行了研究。结果表明,共晶生长速率和温度梯度直接影响共晶的微观结构,在共晶生长过程中,随着微下拉生长速率的增加,共晶微结构逐渐从无序变为有序。通过对共晶微观结构演化机理进行研究,优化生长条件,可获得微观结构排列有序的大尺寸共晶材料,促进有序共晶材料在高分辨探测成像、激光显示与照明、光存储与高温荧光探测等领域的应用。

关键词: GdAlO3-Al2O3共晶; 定向凝固; 微下拉法; 微结构演化

Abstract: GdAlO3(GAP)-Al2O3 oxide eutectic is widely used in high-temperature structural materials due to its high bending strength, excellent creep resistance and oxidation resistance at high temperature. As well known, the properties of eutectic materials are influenced directly by the microstructure of eutectic, and the microstructure of eutectic materials can be arranged in a certain direction through directional solidification technology. Micro-pulling-down method (μ-PD), as a directional solidification technology for crystal growth, has the advantages with large temperature gradient, wide growth rate range, short growth period, and visible growth process. In this work, GdAlO3(GAP)-Al2O3 eutectics were grown by μ-PD, and its microstructure was determined by XRD and SEM. The results show that the microstructure of the obtained eutectics was changed gradually from disorder to order with the increasing of growth rate. The microstructure of eutectic is also influenced by the temperature gradient and growth rate.The evolution mechanism of eutectic microstructure was investigated. By optimizing the growth conditions, large-scale eutectic materials with ordered microstructure are expected to be obtained, which have potential applications in the fields of high-resolution detection imaging, laser display and lighting, optical storage and optical temperature sensor.

Key words: GdAlO3-Al2O3 eutectic; directional solidification; micro-pulling down method; microstructural evolution

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