Effect of Molar Ratio of MgO/Al2O3 on the Performance of MgO-Al2O3-Fe2O3 Composite
The MgO-Al2O3-Fe2O3 composite was 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 molar ratio of MgO/Al2O3 on the sintering and thermal shock resistance of the composite materials was studied. The results showed that increasing the molar ratio of MgO/Al2O3 could improve the densification of the Al2O3-Fe2O3 composites, with the molar ratio of MgO/Al2O3 increased from 3 to 5, densification of the composites didn't increased but decreased. The optimum molar ratio of MgO/Al2O3 of the Al2O3-Fe2O3 composite is equal to 3, the sample MA-3 exhibits better sintering densification and thermal shock resistance. Its primary crystal phases are spinel and periclase, and less amount of sosoloid 20MgO·19Al2O3·Fe2O3. So, the MgO-Al2O3-Fe2O3 composite is acceptable for application in cement rotary kiln linings and high temperature gas filter support.
Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu
Y. Q. Cai et al., "Effect of Molar Ratio of MgO/Al2O3 on the Performance of MgO-Al2O3-Fe2O3 Composite", Advanced Materials Research, Vols. 284-286, pp. 242-245, 2011