Microstructural characterization of the oxide scale grown at the interface between PSZ top coat and MCrAlY bond coat
Identifieur interne : 000144 ( Maroc/Analysis ); précédent : 000143; suivant : 000145Microstructural characterization of the oxide scale grown at the interface between PSZ top coat and MCrAlY bond coat
Auteurs : B. Rhouta [Maroc] ; B. Pieraggi [France]Source :
- Materials science forum [ 0255-5476 ] ; 2001.
Descripteurs français
- Pascal (Inist)
English descriptors
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Abstract
The microstructure of alumina scale grown at the CoNiCrAlY / Y-PSZ (yttria- partially stabilized zirconia) interface upon oxidation in air at 1100 °C for 100 h has been investigated by XRD, SEM, TEM and EDS. The oxide scale microstructure of the plasma-sprayed thermal barrier coatings is characterized by a discontinuous evolution of grain size throughout the scale thickness. The columnar alumina grains in contact with MCrAIY as well as the important porosity observed close to Y-PSZ indicate that the scale growth was evolved by an anionic diffusion mechanism. The observation of a well-defined faceted interface between the innermost alumina grains and metallic bond-coat, as well as the occurrence of epitaxy between these phases definitively prove that the better adhesion of alumina to MCrAlY alloy was achieved by the joining of the oxide and metal lattices, rather than by a keying effect due to the internal oxide precipitates. These latter can contribute to alumina adherence by pinning the emitted dislocations resulting from the displacement of interfacial ledges during alumina growth, and thus increase the metallic strength near the interface.
Affiliations:
- France, Maroc
- Marrakech-Tensift-Al Haouz, Midi-Pyrénées, Occitanie (région administrative)
- Marrakech, Toulouse
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Pascal:02-0303530Le document en format XML
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Pieraggi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>ENSCT (CIRIMAT-INPT-UPS UMR 5085)</s1><s2>31077 Toulouse</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">02-0303530</idno><date when="2001">2001</date><idno type="stanalyst">PASCAL 02-0303530 INIST</idno><idno type="RBID">Pascal:02-0303530</idno><idno type="wicri:Area/PascalFrancis/Corpus">000253</idno><idno type="wicri:Area/PascalFrancis/Curation">000042</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000263</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000263</idno><idno type="wicri:doubleKey">0255-5476:2001:Rhouta B:microstructural:characterization:of</idno><idno type="wicri:Area/Main/Merge">000C39</idno><idno type="wicri:Area/Main/Curation">000C19</idno><idno type="wicri:Area/Main/Exploration">000C19</idno><idno type="wicri:Area/Maroc/Extraction">000144</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Microstructural characterization of the oxide scale grown at the interface between PSZ top coat and MCrAlY bond coat</title><author><name sortKey="Rhouta, B" sort="Rhouta, B" uniqKey="Rhouta B" first="B." last="Rhouta">B. Rhouta</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Département de Chimie, Faculté des Sciences et Techniques Gueliz, B.P 618</s1><s2>Marrakech</s2><s3>MAR</s3><sZ>1 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Marrakech</settlement><region nuts="2">Marrakech-Tensift-Al Haouz</region></placeName></affiliation></author><author><name sortKey="Pieraggi, B" sort="Pieraggi, B" uniqKey="Pieraggi B" first="B." last="Pieraggi">B. Pieraggi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>ENSCT (CIRIMAT-INPT-UPS UMR 5085)</s1><s2>31077 Toulouse</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Materials science forum</title><idno type="ISSN">0255-5476</idno><imprint><date when="2001">2001</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Materials science forum</title><idno type="ISSN">0255-5476</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Air</term><term>Cobalt base alloys</term><term>Interface</term><term>Microstructure</term><term>Non metal coating</term><term>Oxidation</term><term>Oxide layer</term><term>Plasma spraying</term><term>Stabilized zirconia</term><term>Surface treatment</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Revêtement non métallique</term><term>Couche oxyde</term><term>Oxydation</term><term>Interface</term><term>Zircone stabilisée</term><term>Alliage base cobalt</term><term>Microstructure</term><term>Air</term><term>Projection plasma</term><term>Traitement surface</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The microstructure of alumina scale grown at the CoNiCrAlY / Y-PSZ (yttria- partially stabilized zirconia) interface upon oxidation in air at 1100 °C for 100 h has been investigated by XRD, SEM, TEM and EDS. The oxide scale microstructure of the plasma-sprayed thermal barrier coatings is characterized by a discontinuous evolution of grain size throughout the scale thickness. The columnar alumina grains in contact with MCrAIY as well as the important porosity observed close to Y-PSZ indicate that the scale growth was evolved by an anionic diffusion mechanism. The observation of a well-defined faceted interface between the innermost alumina grains and metallic bond-coat, as well as the occurrence of epitaxy between these phases definitively prove that the better adhesion of alumina to MCrAlY alloy was achieved by the joining of the oxide and metal lattices, rather than by a keying effect due to the internal oxide precipitates. These latter can contribute to alumina adherence by pinning the emitted dislocations resulting from the displacement of interfacial ledges during alumina growth, and thus increase the metallic strength near the interface.</div></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Marrakech-Tensift-Al Haouz</li><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Marrakech</li><li>Toulouse</li></settlement></list><tree><country name="Maroc"><region name="Marrakech-Tensift-Al Haouz"><name sortKey="Rhouta, B" sort="Rhouta, B" uniqKey="Rhouta B" first="B." last="Rhouta">B. Rhouta</name></region></country><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Pieraggi, B" sort="Pieraggi, B" uniqKey="Pieraggi B" first="B." last="Pieraggi">B. Pieraggi</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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