Influence of long time post annealing on thermal stability and thermophysical properties of plasma sprayed La2Zr2O7coatings

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dc.contributor.authorErdogan G.
dc.contributor.authorUstel F.
dc.contributor.authorBobzin K.
dc.contributor.authorÖte M.
dc.contributor.authorLinke T.F.
dc.contributor.authorZhao L.
dc.date.accessioned2024-07-22T08:11:19Z
dc.date.available2024-07-22T08:11:19Z
dc.date.issued2017
dc.description.abstractThermal barrier coatings (TBCs) were applied to gas turbines to function at higher gas temperatures. Extensive effort has been invested in identifying new materials with even better performance compared to yttria-stabilized zirconia (YSZ) being the industry standard up-to-date. La2Zr2O7(LZ) with the pyrochlore structure has received attention and been identified as a new candidate material for TBCs. In this study, two different coatings produced with commercial and high-energy ball milled LZ powders were investigated. Coatings were annealed for 50 h, 100 h, 200 h and 500 h at 1150 °C. Microstructures of the coatings were examined with Scanning Electron Microscopy and thermal conductivities were investigated with laser flash measurements. Mercury porosimetry was used as well to identify pore size changes that might occur with annealing process. X-Ray diffraction analysis was used to determine any possible phase changes. The results showed a sintering effect leading to an increase in thermal conductivity, and after 500 h heat treatment time, phase decomposition occurred on LZ based coatings. © 2016 Elsevier B.V.
dc.identifier.DOI-ID10.1016/j.jallcom.2016.10.328
dc.identifier.issn09258388
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/15605
dc.language.isoEnglish
dc.publisherElsevier Ltd
dc.subjectAnnealing
dc.subjectLanthanum compounds
dc.subjectPlasma jets
dc.subjectPlasma spraying
dc.subjectPlasma stability
dc.subjectPore size
dc.subjectScanning electron microscopy
dc.subjectSintering
dc.subjectThermal conductivity
dc.subjectX ray powder diffraction
dc.subjectYttria stabilized zirconia
dc.subjectYttrium metallography
dc.subjectYttrium oxide
dc.subjectZirconia
dc.subjectCandidate materials
dc.subjectHigher gas temperature
dc.subjectLanthanum zirconate
dc.subjectMercury porosimetry
dc.subjectPhase decompositions
dc.subjectPyrochlore structures
dc.subjectThermal barrier coating (TBCs)
dc.subjectYttria-stabilized zirconias (YSZ)
dc.subjectThermal barrier coatings
dc.titleInfluence of long time post annealing on thermal stability and thermophysical properties of plasma sprayed La2Zr2O7coatings
dc.typeArticle

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