催化剂添加量和温度对催化氮化制备低碳MgO-C耐火材料显微结构演变的影响

doi:10.11896/cldb.24030031

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Abstract To investigate the effects of ferric nitrate content and nitridation temperature on the microstructural evolution of ceramic phase in the catalytic preparation of low-carbon MgO-C refractories, fused magnesia, flake graphite, silicon powder, phenolic resin and ferric nitrate were used as the main raw materials. Compared with the material without addition of catalyst (1 400 ℃), the addition of ferric nitrate promoted the formation of new phases of SiC, β-Si₃N₄ and α-Si₃N₄, the whisker-like Mg₂SiO₄ disappeared, and Mg₂SiO₄ mainly existed in the form of larger flakes; when the addition amount of ferric nitrate was 1%, many large-sized flaky Mg₂SiO₄ and more columnar β-Si₃N₄ with small grain size were formed. In the material containing 3% ferric nitrate, the increase of nitridation temperature from 1 400 ℃ to 1 500 ℃ led to the formation and escape of a large amount of gas inside the sample, which reduced the formation of flaky Mg₂SiO₄ and columnar β-Si₃N₄, and Mg₂SiO₄ also existed in worm-like morphology with droplet at the tip.

Key words： low-carbon MgO-C refractory microstructural evolution ceramic phase catalytic nitridation

Published: 25 April 2025 Online: 2025-04-18

CLC number:

TQ175

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	Articles by authors
	CHEN Yang
	LI Zengyi
	WU Zhi
	DENG Chengji
	LOU Xiaoming
	LI Yongqing
	TAN Jialin
	DING Jun
	YU Chao

Cite this article:

CHEN Yang,LI Zengyi,WU Zhi, et al. Effects of Catalyst Content and Temperature on Microstructural Evolution of Low-carbon MgO-C Refractories Prepared by Catalytic Nitridation[J]. Materials Reports, 2025, 39(8): 24030031-5.

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https://www.mater-rep.com/EN/10.11896/cldb.24030031 OR https://www.mater-rep.com/EN/Y2025/V39/I8/24030031

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