BNNTSi3N4陶瓷涡轮的裂纹扩展阻力研究的开题报告Introduction:BNNTSi3N4ceramicturbineiswidelyusedinhigh-temperatureandhigh-pressureenvironments,suchasaerospaceandpowergenerationindustries.However,thefracturebehaviorofceramicmaterialsunderextremeconditionsremainsachallenge,whichlimitsthereliabilityanddurabilityofceramicturbine.ThecrackpropagationresistanceofBNNTSi3N4ceramicturbineisacrucialparameterinassessingitsmechanicalperformanceandfailuremechanism.Objectives:ThemainobjectiveofthisresearchistoinvestigatethecrackpropagationresistanceofBNNTSi3N4ceramicturbineunderextremeconditions,andtoexplorethefactorsthataffectthecrackpropagationbehavior,includingthecrystalstructure,composition,microstructure,andloadingconditions.Methods:Inthisstudy,aseriesofexperimentaltestswillbeconductedtoevaluatethecrackpropagationresistanceofBNNTSi3N4ceramicturbine,whichincludes:1.FabricationofBNNTSi3N4ceramicturbinesampleswithdifferentmicrostructuresandcompositionsusingpowdermetallurgymethod.2.CharacterizationofthecrystalstructureandmicrostructureofthesamplesusingXRD,SEM,andTEM.3.EvaluationofthemechanicalpropertiesofthesamplesusingVickershardness,flexuralstrength,andfracturetoughnesstests.4.Measurementofthecrackpropagationresistanceofthesamplesusingfracturetoughnesstests,fatiguetests,andacousticemissionanalysis.5.Analysisofthecrackpropagationbehaviorusingnumericalsimulationmethods,suchasfiniteelementmethodandcohesivezonemodel.ExpectedResults:TheresultsofthisresearchwillprovideacomprehensiveunderstandingofthecrackpropagationbehaviorofBNNTSi3N4ceramicturbineunderextremeconditions,andwillrevealthefactorsthataffectthemechanicalperformanceandfailuremechanismofceramicmaterials.Thesefindingswillcontributetotheimprovementofthedesignandfabricationofceramicturbine,andwillenhancethereliabilityanddurabilityofceramicmaterialsunderextremeconditions.