Effect of Ferric Oxide Addition on the Performance of MgO-Al2O3 System Materials

Jian Sheng Wang; Zhi Fa Wang; Jing Long Bu; Jun Xing Chen

doi:10.4028/www.scientific.net/AMR.399-401.805

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 399-401Effect of Ferric Oxide Addition on the Performance...

Effect of Ferric Oxide Addition on the Performance of MgO-Al₂O₃ System Materials

Abstract:

The MgO-Al₂O₃ system materials were prepared at 1600°C for 3h with magnesia powder and alumina powder as raw materials and with ferric oxide powder as additive. The effect of the ferric oxide additive on the sintering and thermal shock resistance of the composite materials was studied. The results showed that increasing the ferric oxide dosage could improve the densification of the MgO-Al₂O₃ system materials. In sample MAF-0, crystal phases all are spinel phase. With the ferric oxide dosage increased from 2% to 6% in MAF-2, MAF-4 and MAF-6, the MgAl2O4 (spinel) became the primary crystal phases, and less amount of sosoloid 20MgO•19Al2O3•Fe2O3. In comparison with samples MAF-0, MAF-2, MAF-6, sample MAF-4 has better structure compactness and thermal shock resistance, the optimum ferric oxide dosage was added in MgO-Al₂O₃ system material is equal to 4%. The MgO-Al₂O₃ system material is acceptable for application in cement rotary kiln linings and high temperature gas filter support.