In this work, a series of alumina (Al2O3)-magnesium aluminate (MgAl2O4) ceramic foams (AMCFs) were fabricated from powders of fused white corundum and magnesia (MgO) by a polymeric foam replication method combined with a reaction sintering process. The effects of MgO content and sintering temperature on the sintering properties and post-sintering properties of the AMCFs such as phase composition, appearance, microstructure, cold compressive strength and thermal shock resistance have been investigated. During the sintering process, MgO reacted with Al2O3 to form MgAl2O4 ceramic phase, which contributed to the improvement in sintering properties, cold compressive strength and thermal shock resistance of the AMCFs. The AMCFs doped with 8 wt% MgO and sintered at 1450 degrees C for 2 h displayed high cold compressive strength of 0.89 MPa, good sintering properties and thermal shock resistance. Although their apparent porosities were about 87%, the cold compressive strength of as-prepared foam was about 1.3 times higher than that of commercial Al2O3 foam. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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机译：在这项工作中，通过熔融白刚玉和氧化镁（MgO）的粉末，通过聚合泡沫复制方法结合反应烧结工艺，制备了一系列氧化铝（Al2O3）-铝酸镁（MgAl2O4）陶瓷泡沫（AMCF）。研究了MgO含量和烧结温度对AMCF的烧结性能和后烧结性能的影响，如相组成，外观，微观结构，抗压强度和抗热震性。在烧结过程中，MgO与Al2O3反应形成MgAl2O4陶瓷相，这有助于AMCFs的烧结性能，抗冷强度和抗热震性的提高。掺杂有8 wt％MgO的AMCFs在1450摄氏度下烧结2小时，其冷压缩强度为0.89 MPa，具有良好的烧结性能和抗热震性。尽管它们的表观孔隙率约为87％，但制得的泡沫的冷压缩强度比市售Al2O3泡沫高约1.3倍。 （C）2014 Elsevier Ltd和Techna Group S.r.l.版权所有。
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