摘要
Thefailuremodeandadhesionofthermalbarriercoating(TBC)8YSZ(ZrO2+8%(w/w)Y2O3)depositedonNiCoCrAlTaYbondcoatbyatmosphericplasmasprayingwereinvestigated.Agroovedmodifiedthree-pointbendingspecimenthatcangenerateasingleinterfacecracktofacilitatethecontrolofcrackgrowthwasadoptedfortesting,whichwasconductedattheambienttemperatureof100°C.Themorphologyandcompositionoffracturedsurfaceswereexaminedbymeansofascanningelectronmicroscopy(SEM)andanenergydispersespectroscopy(EDS).ImagesandspectrumshowthatcracksareinitiatedandpropagatedexclusivelywithinYSZlayeradjacenttotop/bondcoatinterface.Theload-displacementcurvesobtainedexhibitsimilarshapesthatindicatetwodistinctstagesincrackinitiationandstablecrackgrowth.FiniteelementanalyseswereperformedtoextracttheadhesionstrengthoftheTBCs.Thedelaminationtoughnessoftheplasma-sprayed8YSZcoatingsat100°C,intermsofcriticalstrainenergyreleaserateGc,canbereliablyobtainedfromananalyticalsolution.
出版日期
2010年10月20日（中国期刊网平台首次上网日期，不代表论文的发表时间）
