Effect of Addition of Al₂O₃-SiO₂ Gel Powder on Strength of Al₂O₃-MgO Unfired Bricks

Abstract:

Al₂O₃-MgO unfired brick were prepared by using brown corundum, white corundum, fused magnesia and α-A1₂O₃ as main starting materials, Al₂O₃-SiO₂ gel powder as a binder. The effects of Al₂O₃-SiO₂ gel powder on the strength of Al₂O₃-MgO unfired bricks were investigated. The phase composition was characterized by X-ray diffraction (XRD). The results showed that with an increase of Al₂O₃-SiO₂ gel powder content, room temperature strength first increased and then decreased, and reached an optimum value at 5.5% addition. The hot modulus of rupture continuously increased. This mainly was related to the reactivity of Al₂O₃-SiO₂ gel powder and the formation of mullite at high temperature.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 546-549
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.546
• Online since: August 2013
• Authors: Jun Cong Wei, Shu Xian Liu, Sen Sen Niu, Wei Ping Ma, Jun Bo Tu
• Keywords: Al₂O₃-MgO Unfired Brick, Al₂O₃-SiO₂ Gel Powder, Strength

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