热震条件下Al2O3-O’-SiAlON-SiC复合材料氧化行为研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (10): 3206-3212.

热震条件下Al₂O₃-O’-SiAlON-SiC复合材料氧化行为研究

苏凯, 陈晓雨, 张婧, 王子昊, 刘新红

郑州大学材料科学与工程学院,河南省高温功能材料重点实验室,郑州 450052

收稿日期:2021-07-27 修回日期:2021-08-31 出版日期:2021-10-15 发布日期:2021-11-11
通讯作者: 刘新红,博士,教授。E-mail:liuxinhong@zzu.edu.cn
作者简介:苏凯(1993—),男,博士研究生。主要从事耐火材料方面的研究。E-mail:18534915393@163.com
基金资助:
国家自然科学基金(51672253,51872266,52172031)

Oxidation Behavior of Al₂O₃-O’-SiAlON-SiC Composite under Thermal Shock Condition

SU Kai, CHEN Xiaoyu, ZHANG Jing, WANG Zihao, LIU Xinhong

Henan Key Laboratory of High Temperature Functional Ceramics, School of Material Science and Engineering,Zhengzhou University, Zhengzhou 450052, China

Received:2021-07-27 Revised:2021-08-31 Online:2021-10-15 Published:2021-11-11

摘要/Abstract

摘要： 以板状刚玉(骨料和细粉)、α-Al₂O₃微粉和硅粉等为原料,在1 500 ℃下埋炭保温3 h烧结制备了Al₂O₃-O’-SiAlON-SiC复合材料。研究了热震及不同热震次数对复合材料氧化行为的影响。研究结果表明:在无热震和热震条件下,试样氧化增重率在900~1 300 ℃均随温度升高而增加;热震氧化条件下的增重率大于无热震条件,且随热震次数增加,氧化增重率略有增加。无热震条件下,试样恒温氧化曲线类似于抛物线型,而热震条件下,试样氧化曲线接近直线型。因此,热震明显促进了复合材料的氧化,其原因在于热震使试样表面的氧化保护膜破裂,试样产生微裂纹,为氧气进入试样内部提供通道,进而加速材料氧化。

关键词: 耐火材料, Al₂O₃-O’-SiAlON-SiC复合材料, 热震, 氧化行为, 物相组成, 显微结构

Abstract: Al₂O₃-O’-SiAlON-SiC composite was prepared from tabular corundum (aggregates and fines), ultra-fine α-Al₂O₃ and Si powder as starting materials at 1 500 ℃ for 3 h in carbon embedded condition. The effects of thermal shock and thermal shock cycle on oxidation behavior of the composite were investigated. The results show that the weight gain ratio of the composite increases with temperature increasing from 900 ℃ to 1 300 ℃ with and without thermal shock condition. The weight gain ratio with thermal shock is more than that without thermal shock, and the weight gain ratio increases with the increase of thermal shock cycle, indicating that thermal shock can promote the oxidation of Al₂O₃-O’-SiAlON-SiC composite. The oxidation curves exhibit parabolic-like without thermal shock, and the curves are linear-like with thermal shock. O’-SiAlON and SiC are oxidized on the surface of sample to form a dense protective film which retards oxygen diffusion into the inner of sample without thermal shock. However, the oxidation protective film is broken under thermal shock condition, which provides passages for oxygen to enter the inner part of the samples, accelerating the oxidation of the composite.

Key words: refractory, Al₂O₃-O’-SiAlON-SiC composite, thermal shock, oxidation behavior, phase composition, microstructure

中图分类号:

TQ175

苏凯, 陈晓雨, 张婧, 王子昊, 刘新红. 热震条件下Al₂O₃-O’-SiAlON-SiC复合材料氧化行为研究[J]. 硅酸盐通报, 2021, 40(10): 3206-3212.

SU Kai, CHEN Xiaoyu, ZHANG Jing, WANG Zihao, LIU Xinhong. Oxidation Behavior of Al₂O₃-O’-SiAlON-SiC Composite under Thermal Shock Condition[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3206-3212.

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热震条件下Al₂O₃-O’-SiAlON-SiC复合材料氧化行为研究

Oxidation Behavior of Al₂O₃-O’-SiAlON-SiC Composite under Thermal Shock Condition

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