Study on the attack of molten silicates on Plasma-Sprayed thermal barrier coatings
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2023
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Journal of Minerals and Materials Characterization and Engineering
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Resumo
Thermal barrier coating (TBC) revolutionized the industry by allowing higher
operating temperatures for equipment, such as gas turbines in the aeronautical
industry. However, at high temperatures, the TBC is exposed to the attack of
molten silicates, known as CMAS (Calcium-Magnesium-Alumino-Silicate),
which are particles from the environment that infiltrate the TBC, causing delamination. In this study, samples coated with TBC by thermal spray and
covered with CMAS were evaluated at temperatures of 1200˚C and 1250˚C.
For each temperature, exposure times of 1 h and 5 h were used. Samples with
longer exposure time had a considerable volume increase. The main contribution of this work was to demonstrate the non-wettability of the CMAS,
even in the 5-h heat treatments, which prevented its infiltration in the deeper
regions. The conditions to guarantee the formation of the silicate and its
consequent wettability are also discussed.
Como referenciar
MARTINS, ROBERTO F.; FRIEHE, KARL; SILVA, CECILIA C.G. e; LAZAR, DOLORES R.R.; COUTO, ANTONIO A.; LIMA, CARLOS R.C. Study on the attack of molten silicates on Plasma-Sprayed thermal barrier coatings. Journal of Minerals and Materials Characterization and Engineering, v. 11, n. 5, p. 115-130, 2023. DOI: 10.4236/jmmce.2023.115010. Disponível em: http://repositorio.ipen.br/handle/123456789/34256. Acesso em: 11 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.