Research on High Performance Fe3Si-Si3N4-SiC Composite Used for Blast Furnace

Yong Li, Xiaoyan Zhu, Yawei Zhai, Jiaping Wang, Wendong Xue*, Junhong Chen, Jialin Sun
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

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© 2012 Li et al;

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* Address correspondence to this author at the School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; Tel: +86-10-62332666; Fax: +86-10-62332666; E-mail:


Excellent Fe3Si-Si3N4-SiC composites were successfully prepared with FeSi75 and SiC as main starting materials by nitridation reaction(at 1300°C for 8Hrs). The material properties were studied; the ferrosilicon nitridation mechanism was analyzed through chemical thermodynamics; phase composition, microstructure, corrosion resistance of products were also investigated. The results are shown that the comprehensive properties of Fe3Si-Si3N4-SiC are outstanding. The nitridation products are fiber-like α-Si3N4 and rod-like β-Si3N4, which makes better mechanical behavior due to fiber reinforcement; a great deal of Fe3Si intermetallic compounds uniformly distribute in matrix, which is one of the products of Fe-Si nitridation and as a plastic phase forming in grain boundary optimizes the performance of products. Chemical thermodynamic analysis is shown that the fiber-like α-Si3N4 is formed by SiO(g) and N2(g) reaction which also increases the rate of nitridation. Fe3Si-Si3N4-SiC material has high corrosion resistance. Now it has been successfully applied to one 2000M3 domestic steel plant, the blast furnace operation goes well.

Keywords: Fe3Si-Si3N4-SiC, composite, nitridation mechanism, plastic phase Fe3Si, corrosion resistance, blast furnace.