镁铝尖晶石原位生成及其对耐火材料结构、性能的影响

doi:10.11896/cldb.22040125

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Abstract MgAl₂O₄ is an important refractory. In addition to utilizing its inherent properties, the in-situ formation of MgAl₂O₄ at high temperatures, including secondary spinelization, is an important means to regulate the microstructure and service performance for refractories. Its expansion effect can offset the shrinkage caused by sintering, which can improve the corrosion resistance of liner such as Al₂O₃-MgO castables, low-carbon MgO-C refractories, and Al₂O₃-MgO-C refractories. Additionally, this effect can seriously affect the reliability of functional refractories. This paper firstly introduces the in-situ formation mechanism of MgAl₂O₄ and focuses on the formation process by gas phase and the phenomenon of secon-dary spinelization. Based on the composition, particle size, atmosphere, temperature and products morphology, the factors for in-situ MgAl₂O₄ formation and their influence on the microstructure and properties of materials are further systematically summarized in Al₂O₃-MgO-MgAl₂O₄ system and carbon-containing system, respectively. Some ways for regulating microstructure and service performance of refractories and several weak contents of current research are also proposed. This paper will provide an important reference for the preparation of refractories with high corrosion resistance and high reliability.

Key words： MgAl₂O₄ in-situ reaction gas phase secondary spinelization performance regulation

Published: 25 October 2023 Online: 2023-10-19

CLC number:

TQ175

Fund:National Key Research and Development Program of China (2021YFB3701400),the National Natural Science Foundation of China (51932008) and ZhongYuan Science and Technology Innovation Leader (204200510011).

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	LIU Guoqi
	LI Hongxia
	YANG Wengang
	QIAN Fan
	LI Yong

Cite this article:

LIU Guoqi,LI Hongxia,YANG Wengang, et al. In-situ MgAl₂O₄ Formation and Its Influence on the Microstructure and Properties of Refractories[J]. Materials Reports, 2023, 37(20): 22040125-5.

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http://www.mater-rep.com/EN/10.11896/cldb.22040125 OR http://www.mater-rep.com/EN/Y2023/V37/I20/22040125

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