Effect of Ferric Nitrate Loading Mode on Properties of Si3N4 Composite MgO-C Refractories Prepared by Nitridation

doi:10.19691/j.cnki.1004-4493.2023.03.002

China's Refractories ›› 2023, Vol. 32 ›› Issue (3): 6-9.DOI: 10.19691/j.cnki.1004-4493.2023.03.002

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Effect of Ferric Nitrate Loading Mode on Properties of Si₃N₄ Composite MgO-C Refractories Prepared by Nitridation

CHEN Yang^1,2,*, DENG Chengji², DING Jun², YU Chao², LOU Xiaoming¹

1 Research Institute of New Building Materials, Hunan Institute of Technology, Hengyang 421002, China;
2 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

Online:2023-09-15 Published:2023-11-07
Contact: *e-mail: chenyang_9210@163.com
About author:Chen Yang, born in 1992, received his doctor’s degree in materials science and engineering from Wuhan University of Science and Technology in 2021, and joined Hunan Institute of Technology in 2022. He is mainly engaged in the preparation of non-oxide ceramic materials, high-value and efficient utilization of raw materials, and design and fabrication of carbon-containing refractories. He has published more than 20 academic articles as the first or co-responding author, among which 10 papers have been indexed by SCI.

Abstract

Abstract: In order to investigate the effect of the catalyst loading mode on the mechanical properties of Si₃N₄ composite MgO-C refractories prepared by nitridation, fused magnesia, flake graphite, silicon powder, and phenolic resin were used as the main raw materials, and ferric nitrate as the catalyst to prepare refractories by nitriding at 1 350 °C. The effects of different catalyst supports (silicon powder, silicon powder + phenolic resin) on the formation of Si₃N₄ in MgO-C refractories and the properties of refractories were studied. The results show that the silicon powder + resin catalyst support promotes the participation of α-Si₃N₄ in the reaction to generate β-Si₃N₄ and MgSiN₂, and generates more SiC. However, this loading mode causes more gas to escape from the refractories and loosens the material structure, which reduces the mechanical properties. On the contrary, MgO-C refractories prepared by nitridation with silicon powder-supported catalysts under the same conditions show higher density and better mechanical properties.

Key words: magnesia-carbon refractories, catalyst support, silicon nitride, mechanical properties

CHEN Yang, DENG Chengji, DING Jun, YU Chao, LOU Xiaoming. Effect of Ferric Nitrate Loading Mode on Properties of Si₃N₄ Composite MgO-C Refractories Prepared by Nitridation[J]. China's Refractories, 2023, 32(3): 6-9.

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Effect of Ferric Nitrate Loading Mode on Properties of Si₃N₄ Composite MgO-C Refractories Prepared by Nitridation

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