Siqi Zhou, Yaowu Wei, Yiming Yu, Christoph Wöhrmeyer, Jianying Gao, Chunfeng Liu
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Abstract
The effect of calcium magnesium aluminate (hereinafter referred to as CMA) on the microstructural distribution of the main impurity SiO2 in magnesia was investigated in this research. The XRD, SEM, and EDS analyses were used in this work. It can be seen from the result that SiO2 in low-grade sintered magnesia diffused into CMA area at high temperature and the distribution of SiO2 in sintered magnesia was significantly reduced. The main mineral phase of sintered magnesia was periclase and monticellite, and impurities in sintered magnesia mainly existed in the form of monticellite, which was completely decomposed into liquid phase and periclase above 1400°C, SiO2 in the liquid phase in the sintered magnesia migrated into the liquid phase that formed in the CMA. Furthermore, the adsorption energy of CaO on SiO2 is stronger than that of MgO on SiO2, so the SiO2 in sintered magnesia diffused into CMA due to its relatively higher CaO content compared with the sintered magnesia. The SiO2 content in fused magnesia was lower than that of sintered magnesia and the dicalcium silicate (C2S) content in fused magnesia was higher than that of sintered magnesia, so the influence of CMA on microstructural distribution of SiO2 in fused magnesia was obviously different than that with low grade sintered magnesia.
期刊介绍：
The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas:
Nanotechnology applications;
Ceramic Armor;
Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors);
Ceramic Matrix Composites;
Functional Materials;
Thermal and Environmental Barrier Coatings;
Bioceramic Applications;
Green Manufacturing;
Ceramic Processing;
Glass Technology;
Fiber optics;
Ceramics in Environmental Applications;
Ceramics in Electronic, Photonic and Magnetic Applications;
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