Phase Reconstruction and Microstructure Evolution of Magnesia-carbon Refractories at High Temperatures in Nitrogen

doi:10.19691/j.cnki.1004-4493.2022.03.004

China's Refractories ›› 2022, Vol. 31 ›› Issue (3): 14-23.DOI: 10.19691/j.cnki.1004-4493.2022.03.004

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Phase Reconstruction and Microstructure Evolution of Magnesia-carbon Refractories at High Temperatures in Nitrogen

YAN Mingwei^1,2, YANG Yumin³, TONG Shanghao⁴, ZHANG Jiayu¹, SUN Guangchao^1,2, LIU Kaiqi^1,2,*

1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 Nanjing IPE Institute of Green Manufacturing Industry, Nanjing 211135, China;
3 AVIC Tianshui New & High Abrasives Co., Ltd., Tianshui 741024, China;
4 Luoyang Lirr Functional Materials Co., Ltd., Luoyang 471039, China Key words：magnesia-carbon refractory; phase reconstruction; microstructure; non-oxide; magnesia

Online:2022-07-15 Published:2022-11-07
Contact: ^*e-mail: kqliu@ipe.ac.cn
About author:Yan Mingwei has been working as an engineering technical application research fellow in Shougang Group Co., Ltd., since June 2022. From April 2020 to March 2022, he worked as a postdoctoral fellow in Institute of Process Engineering, Chinese Academy of Sciences, after receiving his Ph.D degree of material science and engineering from University of Science and Technology Beijing in January 2020. His research interests include ceramic materials synthesis, porous ceramics, metal-oxide refractories, oxide refractories and non-oxide refractories. He has already published more than thirty articles and applied for some patents so far.

Abstract

Abstract: Magnesia-carbon refractories were prepared using fused magnesia, flake graphite and metal aluminum powder as starting materials, phenolic resin as the binder, heat-treating at 1 300-1 600 ℃ in nitrogen atmosphere. The phase reconstruction and the microstructure evolution of the obtained magnesia-carbon refractories were analyzed. The formation mechanisms of magnesia crystals with different morphologies by chemical vapor deposition were revealed. The results show that at 1 300-1 500 ℃, the non-oxides within the specimens are aluminum carbide (Al4C3), aluminum nitride (AlN) and magnesium aluminum nitride (Mg3AlnNn+2, n=2 or 3); at 1 600 ℃, the diffraction characteristic peak intensity of Al4C3 and AlN decreases sharply, and sharp diffraction characteristic peaks of nitrogen aluminum carbide (Al7C3N3) appear. Mg(g) is produced by the aluminothermic reduction and carbothermal reduction of magnesia. On the surface of the specimens, Mg(g) reacts with oxygen to form MgO whiskers. Inside the specimens, Mg(g) and O2(g) undergo a CVD chemical deposition reaction to form cubic MgO crystals. There is a phase relationship between flake AlN and flake Mg3AlnNn+2, and they are so associated with each other that the morphology is difficult to distinguish.

Key words: magnesia-carbon refractory, phase reconstruction, microstructure, non-oxide, magnesia

YAN Mingwei, YANG Yumin, TONG Shanghao, ZHANG Jiayu, SUN Guangchao, LIU Kaiqi. Phase Reconstruction and Microstructure Evolution of Magnesia-carbon Refractories at High Temperatures in Nitrogen[J]. China's Refractories, 2022, 31(3): 14-23.

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Phase Reconstruction and Microstructure Evolution of Magnesia-carbon Refractories at High Temperatures in Nitrogen

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