Al2O3-C耐火材料中随气氛变化的原位陶瓷晶须形成及性能增强

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

Journal of The European Ceramic Society Pub Date : 2025-09-13 DOI:10.1016/j.jeurceramsoc.2025.117824

Yuqi Guo , Ning Liao , Guoping He , Tianbin Zhu , Shengli Jin , Yawei Li

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引用次数: 0

摘要

Al2O3-C耐火材料是连铸过程中控制流动的关键材料，但其组织演变与高温性能之间的关系尚不清楚。本研究系统地研究了添加剂（Si, Al）和热处理气氛（焦炉气氛vs. N2）对Al2O3-C耐火材料显微组织和性能的协同效应。结果表明：1)与焦炭床处理相比，N2气氛使SiC和AlN晶须的原位形成温度降低了100 ~ 200℃，而在1400℃时有利于柱状Sialon的形成。2)N2处理由于晶须的形成加速，在1200℃时达到最佳孔径分布，而焦炭床需要1400℃才能达到同样的细化。3) n2衍生的微观结构优化了孔隙度，减少了氧污染，显著提高了抗热震性和抗氧化性。这项工作促进了对原位陶瓷相形成（SiC/AlN/Sialon）及其在调整Al2O3-C耐火材料使用性能中的作用的理解。

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Atmosphere-dependent in-situ ceramic whisker formation and performance enhancement in Al2O3-C refractories

Al₂O₃-C refractories are critical for flow control in continuous casting, yet the relationship between their structure evolution and high-temperature properties remains insufficiently understood. This study systematically investigates the synergistic effects of additives (Si, Al) and heat-treatment atmospheres (coke-bed vs. N₂) on the microstructure and performance of Al₂O₃-C refractories. The results demonstrated that: 1) Compared to coke-bed treatment, N₂ atmosphere reduces the in-situ formation temperature of SiC and AlN whiskers by 100–200 °C, while facilitating columnar Sialon formation at 1400 °C. 2) N₂ treatment achieves optimal pore size distribution at 1200 °C due to accelerated whisker formation, whereas coke-bed requires 1400 °C for comparable refinement. 3) The N₂-derived microstructure, featuring optimized porosity and minimized oxygen contamination, significantly improves thermal shock resistance and oxidation resistance. This work advances the understanding of in-situ ceramic phase formation (SiC/AlN/Sialon) and its role in tailoring the service performance of Al₂O₃-C refractories.

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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.