Design of next generation thermal barrier coatings - Experiments and modelling英文文献资料

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1、Surface&CoatingsTechnology220(2013)20–26ContentslistsavailableatSciVerseScienceDirectSurface&CoatingsTechnologyjournalhomepage:www.elsevier.com/locate/surfcoatDesignofnextgenerationthermalbarriercoatings—Experimentsandmodellinga,⁎,NicholasCurryabaaMohitGupta,PerNylén,NicolaieMa

2、rkocsan,RobertVaßenaUniversityWest,46186Trollhättan,SwedenbVolvoAeroCorporation,46181Trollhättan,SwedenarticleinfoabstractAvailableonline19September2012Thermalbarriercoating(TBC)systemshavebeenusedinthegasturbineindustrysincethe1980s.Thefutureneedsboththeairandlandbasedturbinei

3、ndustryinvolvehigheroperatingtemperatureswithlongerlifetimeonthecom-Keywords:ponentsoastoincreasepowerandefficiencyofgasturbines.TheaimofthisstudywastomeetthesefutureneedsThermalbarriercoatingsbyfurtherdevelopmentofzirconiacoatings.Theintentionwastodesignacoatingsystemwhichcould

4、beMicrostructureimplementedinindustrywithinthenext3years.Differentmorphologiesofceramictopcoatwereevaluated;Thermalconductivityusingduallayersystemsandpolymerstogenerateporosity.DysprosiastabilisedzirconiawasalsoincludedinLifetimethisstudyasatopcoatmaterialalongwiththestate-of-

5、the-artyttriastabilisedzirconia(YSZ).HighpuritypowdersFiniteelementmodellingYoung'smoduluswereselectedinthiswork.Microstructurewasassessedwithscanningelectronmicroscopeandanin-housedevel-opedimageanalysisroutinewasusedtocharacteriseporositycontent.Evaluationswerecarriedoutusing

6、thelaserflashtechniquetomeasurethermalconductivity.Lifetimewasassessedusingthermo-cyclicfatiguetesting.Finiteelementanalysiswasutilisedtoevaluatethermal–mechanicalmaterialbehaviourandtodesignthemorphologyofthecoatingwiththehelpofanartificialcoatingmorphologygeneratorthroughestabl

7、ishmentofrelationshipsbe-tweenmicrostructure,thermalconductivityandstiffness.Itwasshownthatthecombinedempiricalandnumericalapproachisaneffectivetoolfordevelopinghighperformancecoatings.Theresultsshowthatlargeglobularporesandconnectedcracksinheritedwithinthecoatingmicrostructure

8、resultinacoatingwithbestperformance.Alowthermalconduct