Sintering and characterization of calcium alumino-titanate-SiC composite refractory fired in reducing and oxidizing atmospheres |
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| Affiliation: | 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2. Beijing Key Laboratory of Novel Thin-Film Solar Cells, Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, China;3. School of Sciences, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081, PR China;2. Hunan Jiashunhua New Material Co., Ltd, Hunan, 100085, PR China |
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| Abstract: | Calcium alumino-titanate (CAT) is characterized by low thermal conductivity, low thermal expansion coefficient, and high refractoriness. The phase changes and microstructural evolution of a CAT-SiC composite refractory are investigated using X-ray diffraction, scanning electron microscopy, and thermodynamic analysis. Results show that the cold crush strengths of specimens fired in an oxidizing atmosphere are higher than those of specimens fired in a reducing atmosphere. In a reducing atmosphere, composites with SiO2 addition fired at 1350 °C exhibited the highest strengths. Good bonding occurred between different local reaction zones in specimens fired in an oxidizing atmosphere compared to those fired in a reducing atmosphere. Furthermore, a coexistent state of CA6 and corundum in CAT is observed in specimens fired in a reducing atmosphere, and mullite whisker growth occurred for composites without AlF3·3H2O addition, where the TiO2 present in CAT acts as a catalyst. |
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| Keywords: | CAT-SiC Cold crush strength Atmosphere Mullite whisker Catalyst |
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