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1、南京航空航天大學(xué)碩士學(xué)位論文鈦鋁合金表面涂層工藝與高溫抗氧化性能的試驗(yàn)研究姓名：陳志勇申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：機(jī)械制造及其自動(dòng)化指導(dǎo)教師：黃因慧20080601鈦鋁合金表面涂層工藝與高溫抗氧化性能的試驗(yàn)研究AbstractTiAlintermetallicsalloys(TiAlalloyforshort)arenewtypehightemperaturestructuralmaterialsappliedforaerospaceandaircraftindustriesbecauseoftheirlowdensity,highstrengthandg
2、oodcreepresistance.Theproblemofpoorductilityofthesematerialsatroomtemperaturehasbeenmostlysolvedbyalloyingandmicrostructurecontrolling.Thustheproblemoffartherimprovinghigh-temperatureoxidationresistancehasbecomeoneofthemostimportantresearchsubjects.Inthispaper,high-temperatureox
3、idationresistanceofseveralcoatingsfabricatedbydifferenttechniquesonTiAlalloywasresearched.Thesurfacemorphology,microstructureandphaseofthecoatingsbeforeandafteroxidationwereinvestigatedusingscanningelectronmicroscope(SEM),energydispersivespectroscopy(EDS)andX-raydiffractometry(X
4、RD).Theoxidationmechanismofthedifferentcoatingswasalsodisscusedbasedontheoxidationkinetics,oxidesmorphologyandmicrostructure,etc.(1).High-temperatureoxidationbehaviorofdoubleglowplasmasurfacechromizedlayerswasstudied.TheresultsshowedthatacompactCr2O3oxidefilmwasformedonthesurfac
5、eofthechromizedlayerafterhigh-temperatureoxidation.Althoughtheoxidelayerappearedlocalspallingphenomenonafteralong-termoxidation,anewCr2O3layercanbereformedsoon.Therefore,thechromizedlayerhadagoodhigh-temperatureoxidationresistance.(2).High-temperatureoxidationresistanceofNiCoCrA
6、l-Y2O3coatingspreparedbythetechnologiesoftheplasmasprayingandplasmaspraying-laserremeltingwasanalyzed.Theresultsshowedthatplasma-sprayedNiCoCrAl-Y2O3coatinghadsomedefects,suchasloose,porousandmicrocrack.Thecoatinghadahighercompactness,thelamellarstructureofplasma-sparyedcoatingw
7、aseliminatedandthebondstatebetweenthecoatingandsubstratebecamemetallurgicalcombinationfrommechanicalcombinationafterlaserremelting.Sothelaser-remeltedsamplehadbetterhigh-temperatureoxidationresistancethantheplasma-sprayedcoatingdid.(3)High-temperatureoxidationbehaviorofconventio
8、nalandnanostructuredthermalbarriercoatings(TBCs
