Effect of Molar Ratio of Al₂O₃ to Fe₂O₃ on the Sintering and Thermal Shock Resistance of Al₂O₃-Fe₂O₃ Composite

Abstract:

The Al₂O₃-Fe₂O₃ composite was prepared at 1550°C for 3h with alumina powder and ferric oxide powder as raw materials and with magnesia powder as additive. The effect of molar ratio of Al₂O₃ to Fe₂O₃ on the sintering and thermal shock resistance of the composite materials was studied. The results showed that the apparent porosity and bulk density of the samples both decreased with the molar ratio of Al₂O₃ to Fe₂O₃ increase, as a result, the linear change ratio and bending strength both increased. When the molar ratio of Al₂O₃ to Fe₂O₃ equals to 3, the sample exhibits excellent thermal shock resistance. The XRD and SEM analysis results indicated that the mechanical and thermal proprieties are relative to the microstructure and crystal phases of the composite materials.

• Periodical: Advanced Materials Research (Volumes 194-196)
• Pages: 1745-1748
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.194-196.1745
• Online since: February 2011
• Authors: Zhi Fa Wang, Jian Sheng Wang, Yue Jun Chen, Li Xue Yu, Jing Long Bu, Rong Lin Wang
• Keywords: Alumina, Composite, Ferric Oxide, Molar Ratio, Sintering

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