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Conference Paper: Nanophase decomposition in plasma sprayed ZrO 2(Y 2O 3)/Al 2O 3 coatings

TitleNanophase decomposition in plasma sprayed ZrO 2(Y 2O 3)/Al 2O 3 coatings
Authors
KeywordsAlumina
Annealing
Ceramic Coatings
Decomposition
Energy Dispersive Spectroscopy
Eutectics
Microstructure
Phase Transitions
Plasma Spraying
Quenching
Stoichiometry
Transmission Electron Microscopy
Volume Fraction
X Ray Diffraction Analysis
Zinc Compounds
Issue Date2004
Citation
Ceramic Transactions, 2004, v. 148, p. 91-100 How to Cite?
Abstract
The microstructure and nanophase decomposition of metastable ZrO 2(3Y 2O 3)/Al 2O 3 coatings formed by air plasma spraying was analyzed by combined TEM techniques of nanoprobe diffraction and X-Ray EDS spectroscopy. For the ZrO 2(3Y 2O 3)/20%Al 2O 3 composition, the initial splat-quenched metastable structure consists of a high volume fraction of primary ZrO 2-rich particles with a thin intergranular phase of eutectic composition. Nanoprobe diffraction analysis revealed the presence of two phases: cubic-ZrO 2, and intergranular nanoscale δ-Al 2O 3. Upon heat treatment at 1200°C, the tetragonal ZrO 2 phase appears with a fine-intergranular dispersion of nanoscale α-Al 2O 3. When the annealing temperature reaches 1400°C, the microstructure evolves into an equilibrium non-segregated nanocomposite structure consisting the α-Al 2O 3 grain dispersed within the ZrO 2 matrix.
Persistent Identifierhttp://hdl.handle.net/10722/91402
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Fen_HK
dc.contributor.authorCosandey, Fen_HK
dc.contributor.authorZhou, Xen_HK
dc.contributor.authorKear, BHen_HK
dc.date.accessioned2010-09-17T10:18:42Z-
dc.date.available2010-09-17T10:18:42Z-
dc.date.issued2004en_HK
dc.identifier.citationCeramic Transactions, 2004, v. 148, p. 91-100en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91402-
dc.description.abstractThe microstructure and nanophase decomposition of metastable ZrO 2(3Y 2O 3)/Al 2O 3 coatings formed by air plasma spraying was analyzed by combined TEM techniques of nanoprobe diffraction and X-Ray EDS spectroscopy. For the ZrO 2(3Y 2O 3)/20%Al 2O 3 composition, the initial splat-quenched metastable structure consists of a high volume fraction of primary ZrO 2-rich particles with a thin intergranular phase of eutectic composition. Nanoprobe diffraction analysis revealed the presence of two phases: cubic-ZrO 2, and intergranular nanoscale δ-Al 2O 3. Upon heat treatment at 1200°C, the tetragonal ZrO 2 phase appears with a fine-intergranular dispersion of nanoscale α-Al 2O 3. When the annealing temperature reaches 1400°C, the microstructure evolves into an equilibrium non-segregated nanocomposite structure consisting the α-Al 2O 3 grain dispersed within the ZrO 2 matrix.en_HK
dc.languageengen_HK
dc.relation.ispartofCeramic Transactionsen_HK
dc.subjectAluminaen_HK
dc.subjectAnnealingen_HK
dc.subjectCeramic Coatingsen_HK
dc.subjectDecompositionen_HK
dc.subjectEnergy Dispersive Spectroscopyen_HK
dc.subjectEutecticsen_HK
dc.subjectMicrostructureen_HK
dc.subjectPhase Transitionsen_HK
dc.subjectPlasma Sprayingen_HK
dc.subjectQuenchingen_HK
dc.subjectStoichiometryen_HK
dc.subjectTransmission Electron Microscopyen_HK
dc.subjectVolume Fractionen_HK
dc.subjectX Ray Diffraction Analysisen_HK
dc.subjectZinc Compoundsen_HK
dc.titleNanophase decomposition in plasma sprayed ZrO 2(Y 2O 3)/Al 2O 3 coatingsen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailLiu, F:fordliu@hku.hken_HK
dc.identifier.authorityLiu, F=rp01358en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-2142661520en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-2142661520&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume148en_HK
dc.identifier.spage91en_HK
dc.identifier.epage100en_HK
dc.identifier.scopusauthoridLiu, F=11038795100en_HK
dc.identifier.scopusauthoridCosandey, F=7003683907en_HK
dc.identifier.scopusauthoridZhou, X=7410095159en_HK
dc.identifier.scopusauthoridKear, BH=23080605900en_HK

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