Synthesis of Al2O3-SiC Composite and Its Effect on the Properties of Low-carbon MgO-C Refractories

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (8): 715-720.

• Novel Processing and Characterization Methods • Previous Articles Next Articles

Synthesis of Al₂O₃-SiC Composite and Its Effect on the Properties of Low-carbon MgO-C Refractories

Beiyue Ma¹⁾, Qiang Zhu^1,2), Yong Sun^1,2), Jingkun Yu¹⁾, Ying Li¹⁾

1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
2) Faculty of Engineering, University of Wollongong, Wollongong, NSW 2522, Australia

Received:2009-10-09 Revised:2010-03-03 Online:2010-08-28 Published:2010-08-23
Contact: Beiyue Ma
Supported by:
the National Science and Technology Major Special Project (No. 2009ZX04006-032), the National Natural Science Foundation of China (No. 50274021) and Baoshan Iron and Steel Co., Ltd., China

Abstract

Abstract:

Al₂O₃-SiC composite was synthesized with pyrophyllite and natural graphite as raw materials by carbothermal reduction reaction under argon atmosphere. The effect of synthesis temperature on phase composition and microstructure was investigated. Low-carbon MgO-C refractories were prepared by using the synthesized Al₂O₃-SiC composite as additive. The effect of its addition on the slag penetration and corrosion resistance as well as oxidation resistance of the refractories was investigated, and the slag resistance and oxidation resistance mechanisms of the Al₂O₃-SiC composite were also discussed. The results show that the synthesis temperature has a great influence on preparation of Al₂O₃-SiC composite. The Al₂O₃-SiC composite can be synthesized at 1873-1973 K under argon atmosphere, with pyrophyllite and natural graphite as raw materials, and particle sizes of the composite synthesized at 1973 K are mainly distributed as 1-2 μm. The slag penetration and corrosion resistance of low-carbon MgO-C refractories can be remarkably improved by adding the synthesized Al₂O₃-SiC composite, and the oxidation resistance has an improvement to some extent. The increase of slag viscosity and the formation of MgAl₂O₄ can effectively inhibit the slag penetration and corrosion for the refractories.

Key words: Oxide-nonoxide composite, Carbothermal reduction, Penetration, Corrosion, Oxidation resistance, Refractories

Beiyue Ma Qiang Zhu Yong Sun Jingkun Yu Ying Li. Synthesis of Al₂O₃-SiC Composite and Its Effect on the Properties of Low-carbon MgO-C Refractories[J]. J Mater Sci Technol, 2010, 26(8): 715-720.

References

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Synthesis of Al₂O₃-SiC Composite and Its Effect on the Properties of Low-carbon MgO-C Refractories

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