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Thermal stability of rare earth-pysz thermal barrier coating with high-resolution transmission electron microscopy

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dc.citedby3
dc.contributor.authorMahalingam S.en_US
dc.contributor.authorManap A.en_US
dc.contributor.authorYunus S.M.en_US
dc.contributor.authorAfandi N.en_US
dc.contributor.authorid55434075500en_US
dc.contributor.authorid57200642155en_US
dc.contributor.authorid56902397100en_US
dc.contributor.authorid57189231851en_US
dc.date.accessioned2023-05-29T08:06:51Z
dc.date.available2023-05-29T08:06:51Z
dc.date.issued2020
dc.description.abstractDurability of a thermal barrier coating (TBC) depends strongly on the type of mixed oxide in the thermally grown oxide (TGO) of a TBC. This study aims on discovering the effect of thermal stability in the TGO area containing mixed oxides. Two different bondcoats were studied using high-resolution transmission electron microscopy: high-velocity oxygen fuel (HVOF) and air-plasma spray (APS), under isothermal and thermal cyclic tests at 1400?C. The HVOF bondcoats were intact until 1079 cycles. In comparison, APS failed at the early stage of thermal cycling at 10 cycles. The phase transformation of topcoat from tetragonal to the undesired monoclinic was observed, leading to TBC failure. The results showed that the presence of transient aluminas found in HVOF bondcoat helps in the slow growth of ?-Al2O3 . In contrast, the APS bondcoat does not contain transient aluminas and transforms quickly to ?-Al2O3 along with spinel and other oxides. This fast growth of mixed oxides causes stress at the interface (topcoat and TGO) and severely affects the TBC durability leading to early failure. Therefore, the mixed oxide with transient aluminas slows down the quick transformation into alpha-aluminas, which provides high thermal stability for a high TBC durability. � 2020 by the authors. Licensee MDPI, Basel, Switzerland.en_US
dc.description.natureFinalen_US
dc.identifier.ArtNo1206
dc.identifier.doi10.3390/coatings10121206
dc.identifier.epage19
dc.identifier.issue12
dc.identifier.scopus2-s2.0-85097416457
dc.identifier.spage1
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85097416457&doi=10.3390%2fcoatings10121206&partnerID=40&md5=5d4401f34ed6ca8db24a33d134f68d22
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/25118
dc.identifier.volume10
dc.publisherMDPI AGen_US
dc.relation.ispartofAll Open Access, Gold, Green
dc.sourceScopus
dc.sourcetitleCoatings
dc.titleThermal stability of rare earth-pysz thermal barrier coating with high-resolution transmission electron microscopyen_US
dc.typeArticleen_US
dspace.entity.typePublication
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