材料科学
莫来石
刚玉
烧结
X射线光电子能谱
微观结构
陶瓷
化学工程
扫描电子显微镜
冶金
复合材料
工程类
作者
Ming Feng,Yaqiao Wu,Guorong Ji,Yi Zhou,Xiaojun Wang,Jianying Hao,Yaqun Wu,Yuming Tian
标识
DOI:10.1016/j.ceramint.2022.01.312
摘要
Corundum-mullite duplex ceramic (CMC) is excellent engineering material that can be strengthened by the addition of various compounds. In this study, the sintering mechanisms of CMC with two nAl2O3: mSiO2 stoichiometric ratios (n = 1, m = 0; n = 3, m = 2) were investigated with different amounts of MnO2 addition. The phase transition, microstructure, distribution of elements and ionic valence of the ceramics were identified via X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), respectively. The results show that Al3+ ions in the corundum lattice are replaced by Mn2+ ions. The distorted crystal structure could promote the sintering reaction and leads to a lower sintering temperature. Hence, this study provides beneficial guidance for the industrial production of CMC at lower temperatures and, therefore, with lower energy consumption.
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