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

材料科学技术（英）, 2010, 26(8): 715-720.

^1, , ^2, , ^3, , ^4, , ^5,

1.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China

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

3.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China;Faculty of Engineering,University of Wollongong,Wollongong,NSW 2522,Australia

4.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China

5.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China

基金项目: the National Natural Science Foundation of China(50274021) the National Science and Technology Major Special Project(2009ZX04006-032)

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

Beiyue Ma ^1, , Qiang Zhu ^2, , Yong Sun ^3, , Jingkun Yu ^4, , Ying Li ^5,

1.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China

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

3.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China;Faculty of Engineering,University of Wollongong,Wollongong,NSW 2522,Australia

4.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China

5.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China

Keywords： Oxide-nonoxide composite

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 synthesizedAl2O3-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 andcorrosion resistance of low-carbon MgO-C refractories can be remarkably improved by adding the synthesizedAl2O3-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.

参考文献

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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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