Preparation and Properties of MgAl2O4-CaAl12O19 High Temperature Composite

Yong Hong Wang; Yan Gai Liu; Tao Yang; Zhao Hui Huang; Ming Hao Fang

doi:10.4028/www.scientific.net/KEM.512-515.617

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Preparation and Properties of MgAl2O4-CaAl12O19...

Preparation and Properties of MgAl₂O₄-CaAl₁₂O₁₉ High Temperature Composite

Abstract:

The utilization of lightweight refractories plays an important role in reducing the energy consumption of industrial furnaces. In this paper, MgAl₂O₄-CaA1₁₂O₁₉ high temperature composite was synthesized via solid state reaction using magnesite, dolomite and industrial alumina as raw materials. The influences of raw materials and reaction temperature on phase compositions and microstructure of the composite were investigated by XRD and SEM，respectively. The parameters to prepare MgAl₂O₄-CaA1₁₂O₁₉ high temperature composite were optimized. The results show that the optimum reaction conditions for synthesizing MgAl₂O₄-CaA1₁₂O₁₉ composite is the CA₆/MA weight ratio of 2:3, and the reaction temperature of 1500°C for 4h. The CaA1₁₂O₁₉ crystals showed laminated or plate-like structure, and the MgAl₂O₄ showed spherical morphology. The reaction temperature had little effect on the phase compositions of MA-CA₆ composite in this experiment. The content of Al₂O₃ in the raw material affected the phase composition of MA-CA₆ composite.With the increase of the CaA1₁₂O₁₉ amount, the bending strength of the composite decreased.

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Periodical:

Key Engineering Materials (Volumes 512-515)

Pages:

617-620

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.512-515.617

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Online since:

June 2012

Authors:

Yong Hong Wang, Yan Gai Liu, Tao Yang, Zhao Hui Huang, Ming Hao Fang

Keywords:

Dolomite, Lightweight Refractories, Magnesite, MgAl₂O₄-CaA1₁₂O₁₉, Solid-State Reaction

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