Damage Mechanism and Countermeasures of Al2O3-SiC-C Refractories Under Extreme Conditions

doi:10.19691/j.cnki.1004-4493.2022.02.002

China's Refractories ›› 2022, Vol. 31 ›› Issue (2): 7-11.DOI: 10.19691/j.cnki.1004-4493.2022.02.002

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Damage Mechanism and Countermeasures of Al₂O₃-SiC-C Refractories Under Extreme Conditions

ZHU Shaojun

Shougang Research Institute of Technology, Beijing 100041, China

Online:2022-06-15 Published:2022-07-05
About author:Dr. Zhu Shaojun is mainly interested in the engineering design of refractories production line and the application and research of refractory materials for iron and steel industry. In recent years, he has focused on the research of refractories for blast furnaces, molten iron ladles, torpedo tanks, molten steel ladles and continuous casting.

Abstract

Abstract:

This paper analyzes the extreme application conditions of high temperature, high thermal shock and strong erosion of Al₂O₃-SiC-C refractories for molten iron ladles. It is considered that the main damage mechanism of the refractories is chemical corrosion of oxides (high contents of CaO, FeO and MnO) in the materials, reaction melting erosion, oxidation or decomposition of C or SiC in the materials, melting erosion at high temperatures, and damage under high thermal shock. The analysis results show that the low carbon and low silica Al₂O₃-SiC-C materials with high oxidation resistance should be used. The ratio of Al₂O₃ to SiO₂ in the materials should be greater than 2.5, and the andalusite or pyrophyllite with microcracks, Al₂O₃or Si₃N₄ with in-situ particles or fibers, and the clay or metal with ductility at high temperatures should be added to improve the high temperature corrosion resistance and thermal shock resistance.

Key words: thermal shock resistance, corrosion resistance, high temperature

ZHU Shaojun. Damage Mechanism and Countermeasures of Al₂O₃-SiC-C Refractories Under Extreme Conditions[J]. China's Refractories, 2022, 31(2): 7-11.

Figures/Tables 7

Fig. 1 Phase diagram of CaO-Al2O3-SiO2

Fig. 2 Phase diagram of Al2O3-FeO

Fig. 3 Phase diagram of SiO2-FeO

Fig. 4 Phase diagram of FeO-Al2O3-SiO2

Fig. 5 Phase diagram of Al2O3-MnO

Fig. 6 Phase diagram of SiO2-MnO

Fig. 7 Phase diagram of Al2O3-SiO2

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Damage Mechanism and Countermeasures of Al₂O₃-SiC-C Refractories Under Extreme Conditions

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