Effects of Catalyst Content and Temperature on Microstructural Evolution of Low-carbon MgO-C Refractories Prepared by Catalytic Nitridation
CHEN Yang1,2,*, LI Zengyi1, WU Zhi1, DENG Chengji2, LOU Xiaoming1, LI Yongqing1, TAN Jialin1, DING Jun2,*, YU Chao2
1 School of Materials Science and Engineering, Hunan Institute of Technology, Hengyang 421002, Hunan, China 2 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
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.
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2025, Vol. 39 
