Phase transformations in air plasma-sprayed yttria-stabilized zirconia thermal barrier coatings
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional de Colombia
2014
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| _version_ | 1866817126166167552 |
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| author | Julián D. Osorio |
| author_facet | Julián D. Osorio |
| contents | Phase transformations in air plasma-sprayed yttria-stabilized zirconia thermal barrier coatings Julián D. Osorio Adrián Lopera-Valle Alejandro Toro Juan P. Hernández-Ortiz Ingeniería Heat Treatment Rietveld Analysis Phase Transformation Thermal Barrier Coating (TBC) 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. 2014 artículo científico 0012-7353 https://www.redalyc.org/articulo.oa?id=49631031002 en http://www.redalyc.org/revista.oa?id=496 Dyna application/pdf Universidad Nacional de Colombia Dyna (Colombia) Num.185 Vol.81 |
| format | Artículo científico |
| id | redalyc_49631031002 |
| language | en |
| publishDate | 2014 |
| publisher | Universidad Nacional de Colombia |
| spellingShingle | Phase transformations in air plasma-sprayed yttria-stabilized zirconia thermal barrier coatings Julián D. Osorio Ingeniería Heat Treatment Rietveld Analysis Phase Transformation Thermal Barrier Coating (TBC) Phase transformations in air plasma-sprayed yttria-stabilized zirconia thermal barrier coatings Julián D. Osorio Adrián Lopera-Valle Alejandro Toro Juan P. Hernández-Ortiz Ingeniería Heat Treatment Rietveld Analysis Phase Transformation Thermal Barrier Coating (TBC) 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. 2014 artículo científico 0012-7353 https://www.redalyc.org/articulo.oa?id=49631031002 en http://www.redalyc.org/revista.oa?id=496 Dyna application/pdf Universidad Nacional de Colombia Dyna (Colombia) Num.185 Vol.81 |
| title | Phase transformations in air plasma-sprayed yttria-stabilized zirconia thermal barrier coatings |
| topic | Ingeniería Heat Treatment Rietveld Analysis Phase Transformation Thermal Barrier Coating (TBC) |
| url | https://www.redalyc.org/articulo.oa?id=49631031002 |