Influence of Graphite on Molten-alkali Corrosion Resistance for β-SiAlON-SiC Materials

doi:10.19691/j.cnki.1004-4493.2022.04.005

China's Refractories ›› 2022, Vol. 31 ›› Issue (4): 22-27.DOI: 10.19691/j.cnki.1004-4493.2022.04.005

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Influence of Graphite on Molten-alkali Corrosion Resistance for β-SiAlON-SiC Materials

CAO Huiyan^*, ZHANG Xinhua, HUANG Yifei, WANG Wenwu, WU Jiguang, BU Xiangjuan, XU Haiyang

State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

Online:2022-12-15 Published:2022-12-23
Contact: * e-mail: 13838428457@126.com
About author:Cao Huiyan, born in 1982, obtained her master’s degree in 2008. She has been working in Sinosteel Luoyang Institute of Refractories Research Co., Ltd. since 2008. She commits herself for advanced SiC series refractories research and market development for more than 10 years. As a senior engineer, she is skilled in technical services and engineering guidance for SiC products, especially Si³N⁴ bonded SiC applied in aluminum reduction cell sidewalls and Si³N⁴/SiAlON bonded SiC applied in stacks, bellies and bosh liners, and also tuyere assembly bricks or tuyere blocks of blast furnaces, CDQ (especially for inclined channel area), SiC Muffle in heat treatment furnaces, sintered SiC ceramic slurry pump and SiC products with excellent steam oxidation used in WTE incinerators. She has authored and co-authored about 40 papers.

Abstract

Abstract: β-SiAlON-SiC composites were prepared using SiC particles and fines, silicon powder, AlN powder, α-Al₂O₃ micropowder and flake graphite as starting materials. The influence of the graphite ( particle size of ≤45 and ≤300 μm, addition of 3.0%, 5.5%, 7.5%, and 10.0%, by mass) on the molten-alkali corrosion resistance was investigated. The results show that the molten-alkali resistance for the β-SiAlON-SiC sample with 7.5% of graphite (≤300 μm) is optimal, showing the lowest mass change rate after corrosion and the highest retention ratios of cold modulus of rupture and hot modulus of rupture.

Key words: β-SiAlON-SiC, graphite, molten-alkali corrosion resistance, phase composition, microstructure

CAO Huiyan, ZHANG Xinhua, HUANG Yifei, WANG Wenwu, WU Jiguang, BU Xiangjuan, XU Haiyang. Influence of Graphite on Molten-alkali Corrosion Resistance for β-SiAlON-SiC Materials[J]. China's Refractories, 2022, 31(4): 22-27.

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Influence of Graphite on Molten-alkali Corrosion Resistance for β-SiAlON-SiC Materials

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