AlN/YAlO3复合陶瓷的抗热震性能

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (2): 659-665.

所属专题：陶瓷

AlN/YAlO₃复合陶瓷的抗热震性能

吕绪明^1,2, 张云汉¹, 石国华³, 王嘉炜³, 孙晓红³

1.核工业理化工程研究院,天津 300180;
2.粒子输运与富集技术国防科技重点实验室,天津 300180;
3.天津大学材料科学与工程学院,先进陶瓷与加工技术教育部重点实验室,天津 300072

收稿日期:2023-09-20 修订日期:2023-11-23 出版日期:2024-02-15 发布日期:2024-02-05
通信作者: 孙晓红,博士,教授。E-mail:sunxh@tju.edu.cn
作者简介:吕绪明(1986—),男,博士,高级工程师。主要从事金属陶瓷制备及表面改性的研究。E-mail:lvxuming2008@126.com
基金资助:
中国原子能工业有限公司燎原项目(YZNLY-22631);中国核工业集团研发平台稳定支持科研项目(WDZC-2023-TSNKL-108)

Thermal Shock Resistance of AlN/YAlO₃ Composite Ceramics

LYU Xuming^1,2, ZHANG Yunhan¹, SHI Guohua³, WANG Jiawei³, SUN Xiaohong³

1. Research Institute of Physical and Chemical Engineering of Nuclear Industry, Tianjin 300180, China;
2. Science and Technology on Particle Transport and Separation Key National Defense Laboratory, Tianjin 300180, China;
3. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

Received:2023-09-20 Revised:2023-11-23 Online:2024-02-15 Published:2024-02-05

摘要/Abstract

摘要： AlN陶瓷硬度高、脆性大,难以烧结致密,作为熔炼容器时会因高温变形或被温度变化引起热冲击破坏。将YAlO₃作为颗粒增强相加入AlN中,通过无压烧结方法制备AlN/YAlO₃复合陶瓷,研究不同温度下AlN/YAlO₃复合陶瓷的抗热震性能,分析热震前后AlN/YAlO₃复合陶瓷的物相结构、断口形貌和表面形貌,并阐明热震损伤机理。结果表明,在AlN陶瓷中加入YAlO₃能够促进AlN陶瓷的烧结,将致密度提升至98.37%,同时细化晶粒,提高AlN/YAlO₃复合陶瓷的抗弯强度和抗热震性能。在温度较高的热震试验中,当热震温度升高至600 ℃后,AlN/YAlO₃复合陶瓷的抗弯强度和残余强度保持率显著高于AlN陶瓷,表明添加YAlO₃能够有效提高AlN陶瓷的抗热震性能,这主要归因于微裂纹增韧及裂纹的偏折、分叉等机制的协同作用减缓了AlN/YAlO₃复合陶瓷抗弯强度的降低速度。此外,当热震温度达到1 000 ℃时,AlN发生氧化生成Al₂O₃,导致AlN/YAlO₃复合陶瓷抗弯强度降低。

关键词: AlN/YAlO₃复合陶瓷, 抗热震性能, 抗弯强度, 强度保持率, 表面形貌, 断口形貌

Abstract: AlN ceramics have high hardness and brittleness, and it is difficult to be sintered and dense. As a smelting vessel, it is damaged by high-temperature deformation or thermal shock caused by temperature change. AlN/YAlO₃ composite ceramics were prepared by pressureless sintering method by adding YAlO₃ as a particle reinforcement phase, and the thermal shock resistance of AlN/YAlO₃ composite ceramics at different temperatures was investigated. The phase structure, fracture morphology, and surface morphology of AlN/YAlO₃ composite ceramics before and after thermal shock were analyzed, and the mechanism of thermal shock damage was elucidated. The results show that the addition of YAlO₃ can promote the sintering and increase the density to 98.37% of AlN ceramics. The flexural strength and thermal shock resistance of AlN/YAlO₃ composite ceramics are improved due to the grain refinement. Especially in thermal shock experiments at higher temperatures, when the thermal shock temperature rises to 600 ℃, the flexural strength and residual strength ratio of AlN/YAlO₃ composite ceramics are significantly higher than those of AlN ceramics, indicating that the addition of YAlO₃ can effectively improve the thermal shock resistance of AlN ceramics. It is mainly attributable to microcrack toughening, crack deection and branching behavior slow down the reduction of flexural strength of AlN/YAlO₃ composite ceramics. Moreover, when the thermal shock temperature reaches 1 000 ℃, Al₂O₃ oxidated by AlN reduces severely the flexural strength of AlN/YAlO₃ composite ceramics.

Key words: AlN/YAlO₃ composite ceramics, thermal shock resistance, flexural strength, residual strength ratio, surface morphology, fracture morphology

中图分类号:

TQ174

吕绪明, 张云汉, 石国华, 王嘉炜, 孙晓红. AlN/YAlO₃复合陶瓷的抗热震性能[J]. 硅酸盐通报, 2024, 43(2): 659-665.

LYU Xuming, ZHANG Yunhan, SHI Guohua, WANG Jiawei, SUN Xiaohong. Thermal Shock Resistance of AlN/YAlO₃ Composite Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 659-665.

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AlN/YAlO₃复合陶瓷的抗热震性能

Thermal Shock Resistance of AlN/YAlO₃ Composite Ceramics

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