Porosity characterization and its effect on thermal properties of APS-sprayed alumina coatings

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dc.contributor.authorTillmann, Wolfgang
dc.contributor.authorKhalil, Omar
dc.contributor.authorAbdulgader, Mohamed
dc.date.accessioned2019-10-07T06:45:37Z
dc.date.available2019-10-07T06:45:37Z
dc.date.issued2019-09-24
dc.description.abstractIn the thermal spraying process, the porosity of ceramic coatings contributes directly to the efficiency of the thermal insulation. The size, shape, and distribution of the pores determine the level of both thermal and sintering resistance. In this work, three different atmospheric plasma sprayed (APS) alumina coatings were fabricated with the same spraying parameters using alumina powders with fine, medium, and coarse particle size. The microstructure of the obtained coatings was analyzed regarding the obtained total porosity, pore size, and pore shape. It was found that it is expedient to divide the pore size range into fine, medium, and large sizes. The shape was characterized with regard to the circularity aspect. In this way, all types of cracks can be considered as oblate pores and were included in the calculation of the total porosity. In the case of using fine feedstock powder, the densest coatings were produced among all coatings, and the fraction of fine pores and cracks are thereby substantially higher. However, the total porosity increases with increasing feedstock powder size. A connection was also made between thermal insulation and porosity fraction which includes fine pores and cracks.en
dc.identifier.urihttp://hdl.handle.net/2003/38266
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-20236
dc.language.isoende
dc.relation.ispartofseriesCoatings;9(10)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectAtmospheric plasma spray (APS) processen
dc.subjectParticle sizeen
dc.subjectThermal insulationen
dc.subjectThermal barrier coating (TBC)en
dc.subjectThermal diffusivityen
dc.subjectCoating microstructureen
dc.subjectCoating porosityen
dc.subject.ddc620
dc.subject.ddc670
dc.subject.rswkPlasmaspritzende
dc.subject.rswkTeilchengrößede
dc.subject.rswkWärmeschutzde
dc.subject.rswkBeschichtungde
dc.subject.rswkTemperaturleitfähigkeitde
dc.subject.rswkMikrostrukturde
dc.subject.rswkPorositätde
dc.titlePorosity characterization and its effect on thermal properties of APS-sprayed alumina coatingsen
dc.typeTextde
dc.type.publicationtypearticlede
dcterms.accessRightsopen access
eldorado.secondarypublicationtruede
eldorado.secondarypublication.primarycitationTillmann, W.; Khalil, O.; Abdulgader, M. Porosity Characterization and Its Effect on Thermal Properties of APS-Sprayed Alumina Coatings. Coatings 2019, 9, 601.de
eldorado.secondarypublication.primaryidentifierdoi:10.3390/coatings9100601de

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