Corrosion of chemical-mineralogical gradient submicron-porous Al2O3-MgAl2O4 composite in contact with molten converter slag |
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| Affiliation: | 1. School of Materials Science and Engineering, Zhengzhou University, 100 KexueDadao Road, 450000 Zhengzhou, China;2. Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, 75 Daxue Road, 450052 Zhengzhou, China;3. College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Road, EX4 4QF Exeter, UK;1. School of Metallurgy, Northeastern University, NO.3-11, Wenhua Road, Heping District, Shenyang, 110819, China;2. State Key Laboratory of Rolling and Automation, Northeastern University, NO.3-11, Wenhua Road, Heping District, Shenyang, 110819, China;3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Chair of Ceramic Materials Engineering, University of Bayreuth, 95447 Bayreuth, Germany;3. Wuhan Xinxin Semiconductor Manufacturing Co. Ltd., Wuhan 430070, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;1. CNRS, LCTS, UMR 5801, F-33600 Pessac, France;2. CEA, DAM, LE RIPAULT, F-37260 Monts, France;3. CNRS, IRCER, UMR 7315, F-87068 Limoges, France;1. School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China;2. State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China |
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| Abstract: | Penetration resistance and corrosion mechanism of a novel chemical-mineralogical gradient submicron-porous corundum-spinel composite (A90) to converter slag were investigated and compared to its dense corundum counterpart. Slag-penetration resistance of A90, due to its special submicron-pore structure, is superior to that of the corundum counterpart. Gradient Al2O3-rich spinels pre-embedded on the inner-surfaces of the pores are essential for making the slag deficient in Fe2+ and Fe3+ and CaO-rich. The resultant CaO-rich slag reacted with the corundum matrix of A90, building up a continuous dense layer composed of tightly interlocked highly refractory tabular CaA112O19 and thus suppressing the further slag penetration and corrosion. Due to the lack of MgO in the corundum/molten-slag reaction system, large amounts of low melting iron oxides still remained in the liquid slag, making it much less viscous, so it could penetrate readily the corundum substrate via the grain boundaries in it at the test temperature. |
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| Keywords: | Penetration-corrosion resistances Gradient submicron-porous corundum-spinel composite Special submicron-pore structure Converter slag |
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