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1、DesignofantireflectivecoatingsystemforsapphireheadIntroductionForinfraredwindow,high-speedaircraftheadcovermaterial,inadditiontohavinghighinfraredtransmittance,lowabsorptioncoefficientandexcellentopticalproperties,mustalsohavehighmechanicslstrength,abrasionresist
2、ance,antiwindandrainerosionresistancetochemicalcorrosionresistanee.However,underthepresentconditions,itisdifficulttofindanidealinfraredmaterialtomeettherequirementsofvarioustechnologies・Sapphirehasaseriesofexcellentanduniqueproperties,suchaswidebandrangingfromult
3、raviolet?Visiblelight?NearinfraredMWIR,alsohasexcellentphysical,chemical,mechanicalandthermalpropertiessuchashighstrength,highhardnessandcorrosionresistaneeofhighmeltingpoint?・ThesepropertiesdeterminethatitiscurrentlythebestmaterialforMWIRwindowsandhoods[1].Howev
4、er,limitedtothecurrentmaterialpreparationandprocessingtechnologylevel,thehightemperatureofsapphirewilldecreasegreatly,andtheinfraredtransmittanceof[2]willnotmeetthedesignrequirementsasthetemperatureincreases・Duringthehigh-speedflightofaircraft,thewindoworheadcane
5、asilyreach800DEGCbecauseofaerodynamicheating・Thismeansthatsapphiremustbeimprovedinhighspeedandhightemperatureanditsinfraredtransmitta.neeisimproved.Themosteffectivewaytocompensateforthelackofsapphireperformaneeisthroughsurfacecoating・Theauthorfoundinpreviouswork,
6、thepreparationofSi02thinfilmorSiO2/Si3N4multilayercompositefilmsystemcannotonlyimprovethehightemperaturestrengthofsapphiresapphiresubstrateintheplane,butalsocanimprovetheinfraredtransmittance[3-6]sapphire・ItisalsofoundthattheSi02filmsorSiO2/Si3N4filmspreparedbyma
7、gnetronsputteringarewellsuitedtothesapphiresubstrateforhightemperatureresistanceandaresuitableforantireflectiveandprotectivecoatingmaterialstoimprovethepropertiesofsapphire・Inpracticalapplications,sapphirematerialsareoftenmachinedintocurvedsurfacestoserveasinfrar
8、edfairingwindows(Sapphireheads)・Inordertoeffectivelyimprovetheperformancerequirementsofsapphiredome,thispaperintendstoprepareSi02antireflectioncoatingonsapphir
