Effects of Al2O3-SiO2 Raw Material Types on Properties of Anorthite Based Insulation Refractories

doi:10.19691/j.cnki.1004-4493.2024.01.005

China's Refractories ›› 2024, Vol. 33 ›› Issue (1): 23-27.DOI: 10.19691/j.cnki.1004-4493.2024.01.005

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Effects of Al₂O₃-SiO₂ Raw Material Types on Properties of Anorthite Based Insulation Refractories

DU Juan¹, GUO Huishi², YANG Jialin², LI Wenfeng^1,*, GUI Yanghai², ZHAO Zhiqiang², LIU Yingfan²

1 School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, China;
2 School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450051, China

Online:2024-03-15 Published:2024-04-07
Contact: *e-mail: wenfeng_li@haut.edu.cn
About author:Du Juan, born in 1995, graduated from Luoyang Institute of Science and Technology with a bachelor's degree in materials science and engineering in 2018. Now she is studying for a master's degree in Henan University of Technology. She mainly engages in the research of refractories and high temperature ceramics.

Abstract

Abstract: To optimize their Al₂O₃-SiO₂ raw materials, anorthite based insulation refractories were prepared by the in-situ sintering process combined with the foaming method after sintering at 1 350 ℃ for 3 h, using green and pollution-free kaolin, kyanite, andalusite and sillimanite as Al₂O₃-SiO₂ raw materials, respectively, and industrial CaCO₃ as the CaO source. Effects of Al₂O₃-SiO₂ raw material types on the physical properties, phase composition and microstructure were investigated. The results are as follows. All samples prepared by different Al₂O₃-SiO₂ raw materials have hexagonal flake anorthite and a small amount of mullite and corundum. Their bulk density and thermal conductivity decrease in the order of using kaolin, andalusite, kyanite and sillimanite as the Al₂O₃-SiO₂ raw material, but their apparent porosity increases. Moreover, in the sample with kaolin, the bonding between anorthite crystals on the pore walls is closer than that of the other samples, which is conducive to increasing the cold crushing strength. The bonding between anorthite crystals on pore walls gradually decreases in the order of using kyanite, andalusite and sillimanite as the Al₂O₃-SiO₂ raw material, thus their cold crushing strength decreases accordingly. In comprehensive consideration, the properties of the sample from kyanite are the optimal. Its apparent porosity, thermal conductivity and cold crushing strength are 84.6%, 0.141 W·m^-1·K^-1 and 1.89 MPa, respectively.

Key words: anorthite based insulation refractories, Al₂O₃-SiO₂ raw materials, crushing strength, thermal conductivity, microstructure

DU Juan, GUO Huishi, YANG Jialin, LI Wenfeng, GUI Yanghai, ZHAO Zhiqiang, LIU Yingfan. Effects of Al₂O₃-SiO₂ Raw Material Types on Properties of Anorthite Based Insulation Refractories[J]. China's Refractories, 2024, 33(1): 23-27.

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Effects of Al₂O₃-SiO₂ Raw Material Types on Properties of Anorthite Based Insulation Refractories

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