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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
