Abstract
To solve the problem of poor high-temperature service performance caused by low carbonization of MgO–C refractories, low-carbon MgO–C refractories with excellent thermal shock, oxidation and corrosion resistances were successfully designed by using SiC whiskers as reinforcing phases and introducing micro-Al2O3 powders as additives. The results indicated that the addition of micro-Al2O3 powders optimized the internal structure of the material, like the columnar β-Si3N4 with a stepped distribution and the mosaic structure formed between granular and flaky Mg2SiO4, which synergistically strengthened and toughened the material and gave the material excellent mechanical properties and thermal shock resistance. Specifically, the cold modulus of rupture and cold crushing strength after thermal shock were increased by 4.1 and 20.3 MPa, respectively. Moreover, the addition of micro-Al2O3 powders promoted the formation of fine particles of Mg2SiO4, MgAl2O4 and MgO, as well as a dense protective layer of Mg2SiO4 in the material under high-temperature environment. Furthermore, spinel and high-temperature solid solution were formed in the corrosion environment. The oxidation and corrosion resistances were greatly improved by 41% and 15%, respectively.
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Acknowledgements
The authors acknowledge financial support from the Scientific Research Fund of Hunan Provincial Education Department (22B0856), the Hengyang “Xiaohe” Science and Technology Talent Special Project ([2023]45), the Guidance Plan Project of Hengyang City ([2023]40), the National Natural Science Foundation of China (U20A20239), the College Students' Innovation and Entrepreneurship Training Project (S202311528055), and the Characteristic Application Discipline of Material Science Engineering in Hunan Province ([2022]351). Moreover, the authors sincerely thank Prof. Zhi Wu at Hunan Institute of Technology for his guidance and help in the refractoriness under load test.
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Chen, Y., Li, Zy., Tan, Hb. et al. Effect of micro-Al2O3 powders on oxidation and corrosion behaviors of low-carbon MgO–C refractories. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-024-01207-4
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DOI: https://doi.org/10.1007/s42243-024-01207-4