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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
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