Thermal Stability of Hexaaluminate Film Coated on SiC Substrate for High-Temperature Catalytic Application |
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Authors: | Hiroshi Inoue Koshi Sekizawa Koichi Eguchi Hiromichi Arai |
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Affiliation: | Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816, Japan |
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Abstract: | A coating of barium hexaaluminate (Ba0.75Al11.0O17.25) on an α-SiC substrate and the thermal stability of the formed film were investigated for a high-temperature catalytic application. The film prepared by sol coating consisted of BaAl2Si2O8 and α-Al2O3 phases and always contained many cracks or exfoliations after heating at 1200C. A hexaaluminate porous film was successfully formed by slurry coating without void formation at the interface between the film and the substrate and exfoliation due to the formation of the intermediate layer after heating at 1200°C. The microstructure of the film remained unchanged, even after heating at 1300°C. |
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