In-situ Formation of MgAl2O4: A Methodof Tailoring Microstructure and Propertiesfor Development of High-performance Refractories

doi:10.19691/j.cnki.1004-4493.2023.02.001

China's Refractories ›› 2023, Vol. 32 ›› Issue (2): 1-6.DOI: 10.19691/j.cnki.1004-4493.2023.02.001

In-situ Formation of MgAl₂O₄: A Methodof Tailoring Microstructure and Propertiesfor Development of High-performance Refractories

LIU Guoqi¹, WANG Minghui², LI Hongxia^1,*, YU Jianbin¹, GAN Feifang³, GU Qiang¹, MA Weikui¹

1 State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co, Ltd., Luoyang 471039, China;
2 Zhengzhou University, Zhengzhou 450052, China;
3 Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China

Online:2023-06-15 Published:2023-06-19
Contact: *e-mail: lihongx0622@126.com
About author:Liu Guoqi, born in 1975, received his doctor's degree in materials science from University of Science and Technology Beijing in 2006. He is mainly engaged in functional refractories for basic and applied research. He has published more than 70 articles in China and oversea scientific journals, among which more than 20 papers have been indexed by EI or SCI. He has applied for more than 30 patents and obtained 20 authorized invention patents.

Abstract

Abstract: The in-situ formation mechanism of MgAl₂O₄ was introduced, focusing on the formation process by solid phase reaction and gas phase reaction as well as the phenomenon of secondary spinelization. The influencing factors of the in-situ MgAl₂O₄formation and its effect on the microstructure and the properties of materials were systematically summarized for the Al₂O₃-MgO-MgAl₂O₄ system and the carbon-containing refractories systems. It was pointed out that the in-situ formation of MgAl₂O₄, including secondary spinelization, can regulate the microstructure and the service performance of materials. Its expansion effect can not only offset the shrinkage caused by sintering to improve the corrosion resistance of refractories, but also seriously restrict the reliability of functional refractories. The composition, the particle size, the atmosphere, and the temperature are important factors affecting the in-situ formation of MgAl₂O₄. In the carbon-containing materials systems, the solid-solid reaction and the gas-solid reaction coexist to produce MgAl₂O₄, which provides an effective way to further regulate the microstructure and the properties of materials through the reaction process.

Key words: MgAl₂O₄, in-situ, spinalization, gas phase, secondary spinalization, high temperature

LIU Guoqi, WANG Minghui, LI Hongxia, YU Jianbin, GAN Feifang, GU Qiang, MA Weikui. In-situ Formation of MgAl₂O₄: A Methodof Tailoring Microstructure and Propertiesfor Development of High-performance Refractories[J]. China's Refractories, 2023, 32(2): 1-6.

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In-situ Formation of MgAl₂O₄: A Methodof Tailoring Microstructure and Propertiesfor Development of High-performance Refractories

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