Macroporous high-temperature insulators physical properties by in situ CA6 formation: Does the calcium source matter? |
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| Affiliation: | 1. Federal University of Sao Carlos, Graduate Program in Materials Science and Engineering, Brazil;2. Materials Microstructure Engineering Group (GEMM), FIRE Associate Laboratory, Federal University of São Carlos, Materials Engineering Department, Rodovia Washington Luis, Km 235, São Carlos, SP, 13565-905, Brazil;3. College of Technology (FATEC), Jordão Borghetti Street 480, Sertãozinho, SP, 14160-050, Brazil;1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;2. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, 114051, China;4. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;1. Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;2. Puyang Refractories Group Co., Ltd, Middle West Circle Road, Puyang, 457100, China;3. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, Leuven, 3001, Belgium;1. Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan;2. Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan;3. The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Osaka 567-0047, Ibaraki, Japan |
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| Abstract: | Aiming the in situ formation of CA6 (CaO·6Al2O3) at alumina-based macroporous insulators, distinct Ca2+ sources and contents were used and their effect on some of the refractories properties were investigated. Adding CaCO3, Ca(OH)2 or CaO resulted in the decrease of the onset strengthening temperature (TS) and also of the linear shrinkage. However, a higher amount of Ca(OH)2 and CaO could not be used because of their effect on reducing the insulator total porosity. The composition prepared with 12.9 wt% of CaCO3 was the most promising one, leading to an expansion of 0.81 % after firing at 1600 °C for 5 h, TS of 680 °C and low thermal conductivity. These results point out the potential reduction of sintering temperatures and to the possibility of in situ firing the ceramic insulator. These features enable the development of a macroporous refractory composition with a higher thermal insulating effectiveness, which can help industries to decrease their energy demand. |
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| Keywords: | Calcium sources Macroporous insulators Direct foaming Linear shrinkage |
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