Hot corrosion behavior of Mg\(_{2}\)SiO\(_{4}\) ceramic exposed to molten Na\(_{2}\)SO\(_{4}\) at 900℃ to 1100℃

Hamza MILLES; Louafi  SNANI; Amel  OULABBAS; Khaled  TOUALBIA

doi:10.55713/jmmm.v34i1.1777

Authors

Hamza MILLES Department of Metallurgy and Materials Engineering, Badji Mokhtar-Annaba University, P.O Box.12, Annaba, 23000, Algeria
Louafi SNANI Department of Metallurgy and Materials Engineering, Badji Mokhtar-Annaba University, P.O Box.12, Annaba, 23000, Algeria
Amel OULABBAS Research Centre in Industrial Technologies (CRTI) P.O.Box 64, Cheraga, 16014 Algiers, Algeria
Khaled TOUALBIA Department of Material Sciences, Abbes Laghrour University, Road of Batna, Khenchela, 40004, Algeria

DOI:

https://doi.org/10.55713/jmmm.v34i1.1777

Keywords:

Forsterite, Thermal barrier, Hot corrosion, Molten salt

Abstract

Thermal barriers are used as protective coating for critical components working at high temperature of gas turbines. Forsterite (Mg₂SiO₄) ceramic is proposed by researchers as a novel thermal barrier coating (TBC), due to its low thermal conductivity and good thermal expansion. Hot corrosion results from the molten salts effect on the TBC’s surface, accumulated during the combustion processes. In this study, Mg₂SiO₄samples were exposed to Na₂SO₄ molten salt at 900℃, 1000℃ and 1100℃ for 6 h in air. Samples were investigated and compared using scanning electron microscope (SEM) and X-Ray diffractometer (XRD). MgSO₄ was the predominant corrosion product observed on the surface of the samples. Na₂Mg₅Si₁₂O₃₀ was also observed at 1000℃ and 1100℃, and Na₂SiO₃ appeared only on sample treated at 900℃.

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