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Measurement of the Volume Expansion of SiC Refractories Induced by Molten Salt Corrosion
E. de Bilbao1, P. Prigent1, C. Mehdi-Souzani2, M.-L. Bouchetou1, N. Schmitt2, J. Poirier1, E. Blond3
1 CEMHTI, CNRS UPR3079/Université d'Orléans, 1D avenue de la Recherche Scientifique, 45071 Orléans, France
2 LMT-Cachan, ENS Cachan/CNRS UMR 8535/UMPC, 61, avenue du Président Wilson, 94235 Cachan, France
3 Prisme, Université Orléans, 8 rue Léonard de Vinci, 45072 Orléans, France
received April 22, 2013, received in revised form June 3, 2013, accepted June 11, 2013
Vol. 4, No. 4, Pages 207-2012 DOI: 10.4416/JCST2013-00011
Abstract
Corrosion tests of oxide-bonded SiC-based refractory cylinders with molten salts (mainly CaSO4, K2SO4) were performed at high temperature to enable better understanding of the corrosion mechanisms operating in these materials. Salt pellets were placed on the upper surface of small refractory cylinders. After they had been melted, the corrosive product soaked into the pores of the refractory cylinders and partially corroded the SiC phase. SEMEDS analyses showed that CaSiO3 was the main new phase formed, growing from SiC aggregates into the pores. The shapes of the initial and corroded cylinders were measured at room temperature using a 3D coordinate measuring machine equipped with a laser-plane sensor. These measurements enabled monitoring of the evolution of the residual radial deformation versus the depth from the surface in contact with the salt pellets, and consequently the characterisation of the local volume expansion induced by the phase change. Coupling SEM-EDS analyses with 3D digitising revealed the link between the corrosion product and the volume expansion.
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Keywords
Corrosion, SiC, refractories, volume expansion
References
1 Blond, E., Schmitt, N., Hild, F., Blumenfeld, P., Poirier, J.: Effect of slag impregnation on thermal degradations in refractories, J. Am. Ceram. Soc., 90, (1), 154 – 162, (2007).
2 Lee, W.E., Moore, R.E.: Evolution of in situ refractories in the 20th century, J. Am. Ceram. Soc., 81, (6), 1385 – 1410, (1998).
3 Lee, W.E., Zhang, S.: Melt corrosion of oxide and oxide-carbon refractories, Int.Mater. Rev., 44, (3), 77 – 104, (1999).
4 Rezaie, A., Headrick, W.L., Fahrenholtz, W.G., Moore, R.E., Velez, M., Davis, W.A.: Interaction of refractories and alkaline containing corrodants, Refractories Applications and News, 9, (5), 26 – 31, (2004).
5 Rau, A.W.: CFB refractory improvements for biomass co-firing, Power Eng., 114, (7), 36 – 44, (2010).
6 Vaughn, W.L., Maahs, H.G.: Active-to-passive transition in the oxidation of silicon carbide and silicon nitride in air, J. Am. Ceram. Soc., 73, (6), 1540 – 1543, (1990).
7 Wang, G.X., Lu, G.Q., Pei, B., Yu, A.B.: Oxidation mechanism of Si3N4-bonded SiC ceramics by CO, CO2 and steam, J. Mater. Sci., 33, (5), 1309 – 1317, (1998).
8 More, K.L., Tortorelli, P.F., Ferber, M.K., Keiser, J.R.: Observations of accelerated silicon carbide recession by oxidation at high water-vapor pressures, J. Am. Ceram. Soc., 83, (1), 211 – 213, (2000).
9 Gallet-Doncieux, A., Bahloul, O., Gault, C., Huger, M., Chotard, T.: Investigations of SiC aggregates oxidation: Influence on SiC castables refractories life time at high temperature, J. Eur. Ceram. Soc., 32, (4), 737 – 743, (2012).
10 Prigent, P., Bouchetou, M.-L., Poirier, J., Brossard, J.-M.: Study of the corrosion mechanisms of SiC refractory lining in municipal solide waste-to-energy facilities, in: Proceedings of Unitecr' 2009, Salvador (Brazil), 2009.
11 Tonnensen, T., Telle, R.: Refractory corrosion in industrial waste incineration processes, Refractories WORLDFORUM, 1, (1), 71 – 76, (2009).
12 Prigent, P., Bouchetou, M.-L., Poirier, J.: Corrosion of SiC based refractories by molten salts in municipal solid waste-to-energy facilities, in: Proceedings of conference of metallurgists, Vancouver (Canada), 2010.
13 Bale, C.W., Chartrand, P., Degterov, S.A., Eriksson, G., Hack, K., Ben Mahfoud, R., Melançon, J., Pelton, A.D., Petersen, S.: FactSage thermochemical software and databases, Calphad, 26, (2), 189 – 228, (2002).
14 Prigent, P., Bouchetou, M.-L., Poirier, J., de Bilbao, J., Blond, E.: Corrosion of oxide bonded silicon carbide refractories by molten salts in solid waste-to-energy facilities, Ceram. Int., 38, (7), 5643 – 5649, (2012).
15 Tomita, K., Kawano, M.: Effect of cations on crystallization of amorphous silica. II, Kagoshima Daigaku Rigakubu Kiyo. Chigaku seibutsugaku, 26, 1 – 16, (1993).
16 Akopov, E.K., Bergman, A.G.: Decomposition of the solid solutions in the reciprocal system of the chlorides and sulfates of sodium and potassium, Zhur. Neorg. Khim., 4, 1653 – 1656, (1959).
17 Mehdi-Souzani, C., Lartigue, C.: Contact less laser-plane sensor assessment : Toward a quality measurement, in: Proceedings of IDMME-virtual concept 2008, Beijing (China), 2008.
18 Mehdi-Souzani, C., Thiebaut, F., Lartigue, C.: Scan planning strategy for a general digitized surface, J. Comput. Inf. Sci. Eng., 6, (4), 331 – 339, (2006).
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