Influence and Mechanism of Novel Si-N-O Micropowder on Properties of Castables for Iron Runners

doi:10.19691/j.cnki.1004-4493.2025.02.003

China's Refractories ›› 2025, Vol. 34 ›› Issue (2): 9-16.DOI: 10.19691/j.cnki.1004-4493.2025.02.003

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Influence and Mechanism of Novel Si-N-O Micropowder on Properties of Castables for Iron Runners

LI Youqi^1,*, HE Jian¹, FU Lyuping², ZHANG Jialiang¹, LI Zhengkun¹

1 Jiangsu Jingxin New Materials Co., Ltd., Yangzhou 225000, China;
2 State Key Laboratory of Advanced Refractories, Wuhan University of Science and Technology,Wuhan 430081, China

Online:2025-06-15 Published:2025-06-16
Contact: *e-mail: 13348121669@163.com
About author:Li Youqi, senior engineer, was awarded the titles of “Double Creation Talents” in Jiangsu Province, “Green Yang Golden Phoenix Leading Talents” in Yangzhou City, and “Science and Technology Leading Talents” in Luoyang City; won one second prize for scientific and technological progress in Henan Province, and one first and one second prize for technological innovation in the building materials industry in Henan Province. He hosted and participated in over 10 national, provincial, and municipal scientific research projects, and contributed to the revision of 9 standards, including one international standard and 8 national and industry standards. He has published nearly 40 academic papers and granted over 100 patents.

Abstract

Abstract: In order to improve the service performance of Al₂O₃-SiC-C castables, a novel Si-N-O composite micropowder was synthesized by the chemical combustion method. Using brown corundum, sintered alumina, silicon carbide, active α-Al₂O₃micropowder, SiO₂ micropowder, calcium aluminate cement, Si powder and spherical asphalt as the raw materials, adding additive of Si-N-O composite micropowder, Al₂O₃-SiC-Si₃N₄/Si₂N₂O-C castables were prepared. The effects of the Si-N-O composite micropowder addition on the mechanical properties and oxidation resistance of the castables were investigated, and the intrinsic mechanism of strengthening and antioxidation caused by this novel additive was discussed. Experimental results show the introduction of Si-N-O composite micropowder leads to significant improvement in the cold strength, oxidation resistance, thermal shock resistance and hot modulus of rupture of the Al₂O₃-SiC-C castables. When the Si-N-O composite micropowder addition is approximately 3 mass%, the castable possesses the best comprehensive performance.

Key words: Al₂O₃-SiC-C, physical properties, castable, oxidation resistance, microstructure

LI Youqi, HE Jian, FU Lyuping, ZHANG Jialiang, LI Zhengkun. Influence and Mechanism of Novel Si-N-O Micropowder on Properties of Castables for Iron Runners[J]. China's Refractories, 2025, 34(2): 9-16.

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Influence and Mechanism of Novel Si-N-O Micropowder on Properties of Castables for Iron Runners

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