Escudo de la República de Colombia
Sistema Nacional de Biliotecas - Repositorio Institucional Universidad Nacional de Colombia Biblioteca Digital - Repositorio Institucional UN Sistema Nacional de Bibliotecas UN

Phase transformations in air plasma-sprayed yttria-stabilized zirconia thermal barrier coatings

Osorio, Julián D. and Lopera-Valle, Adrian and Toro, Alejandro and Hernández-Ortiz, Juan P. (2014) Phase transformations in air plasma-sprayed yttria-stabilized zirconia thermal barrier coatings. Dyna; Vol. 81, núm. 185 (2014); 13-18 DYNA; Vol. 81, núm. 185 (2014); 13-18 2346-2183 0012-7353 .

Texto completo

[img]
Vista previa
PDF
946kB
[img] Microsoft Word
40kB

URL oficial: http://revistas.unal.edu.co/index.php/dyna/article...

Resumen

Phase transformations in air plasma-sprayed thermal barrier coatings composed of ZrO2 – 8 wt.% Y2O3 (zirconia - 8 wt.% yttria) are studied using X-Ray diffraction and Rietveld refinement measurements. Samples of TBC deposited onto Inconel 625 substrate were fabricated and heat treated at two different conditions: exposition to 1100ºC up to 1000 hours and exposition to temperatures between 700ºC and 1100ºC during 50 hours. According to Rietveld refinement measurements, the content of the cubic phase in the top coat increases with time and temperature; it starts at 7.3 wt.% and reaches 15.7 wt.% after 1000 hours at 1100ºC. The presence of a cubic phase in high amounts is undesirable due its lower mechanical properties compared with the tetragonal phase. After 800 hours of exposure to high temperature, the amount of Y2O3 in the tetragonal phase reduces to 6.6 wt.% and a fraction of this phase transforms to a monoclinic structure during cooling. The monoclinic phase reached 18.0 wt.% after 1000 hours. This phase is also undesirable, not only due to its higher thermal conductivity, but also because the tetragonal-to-monoclinic transformation implies a volume change of circa 5%, which favors crack formation and propagation and compromises the coating integrity.

Tipo de documento:Artículo - Article
Información adicional:Derechos de autor reservados
Palabras clave:Thermal Barrier Coating (TBC), Heat Treatment, Phase Transformation, Rietveld Analysis
Unidad administrativa:Revistas electrónicas UN > Dyna
Código ID:33544
Enviado por : Dirección Nacional de Bibliotecas STECNICO
Enviado el día :01 Julio 2014 09:35
Ultima modificación:18 Agosto 2014 20:21
Ultima modificación:18 Agosto 2014 20:21
Exportar:Clic aquí
Estadísticas:Clic aquí
Compartir:

Solamente administradores del repositorio: página de control del ítem

Vicerrectoría de Investigación: Número uno en investigación
Indexado por:
Indexado por Scholar Google WorldCat DRIVER Registry of Open Access Repositories OpenDOAR Metabiblioteca BDCOL OAIster Red de repositorios latinoamericanos DSpace BASE Open archives La referencia Colombiae Open Access Theses and Dissertations Tesis latinoamericanas CLACSO
Este sitio web se ve mejor en Firefox