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PPT coursewareforEnglish versionofabsorbing ma•Introduction toAbsorbingMaterials•The principleof absorbingmaterials目录•Preparation methodofabsorbing materialscontents•The DevelopmentTrends andProspects of AbsorbingMaterials•Research progressof absorbing目录materialscontents01Introduction toAbsorbingMaterialsCHAPTERDefinitionof absorbing materialsAbsorbing materials are substantialthat hasthe ability to absorbenergyor otherforms ofradiationThey canabsorb electricalwaves,sound waves,or otherforms ofenergy,converting itinto heator anotherform ofenergyClassification of absorbing materialsAccording to thetype ofenergy absorbed,absorbingmaterials canbe dividedinto electricalabsorbingmaterials,sound waveabsorbing materials,and othertypesElectricalabsorbing materials can further be classifiedintoelectrical absorption,magnetic absorption,andconductive absorptionmaterialsApplication fieldsof absorbing materialsAbsorbing materials have awide In the field of radar absorption,In stainless technology,absorbingrange of applications,including absorbing materials canmaterials areused tocoverradar absorption,stainless effectivelyabsorb incomingradar aircraft,ships and other vehicles,technology,electrical interferencewaves,reducing theradar crossreducing theirradar crosssectionsuppression,heat preservation section oftargets andmaking andmaking themhard to detectand insulation,sound absorption them difficulttodetectby radarandnoise reduction,etcApplication fieldsof absorbing materialsIn the field ofelectrical interferencesuppression,absorbing materialscan absorbelectricalwaves generatedby electronicdevices,reducing electrical interferenceand improvingsignal qualityInthe fieldof heat preservation andinsulation,absorbing materialscan effectivelyabsorband convert heat energy,improving theheatpreservationand insulationperformanceof buildingsand vehiclesInthefieldof soundabsorption andnoise reduction,absorbing materialscanabsorb soundwaves,reducing noiselevels andimproving acousticcomfort02The principleofabsorbing materialsCHAPTERPrincipleof ElectricalWave AbsorptionElectrical wave absorptionoccurs whenthe electricalwaveaccountants materialshave theabilityto convert itsenergy intoheator otherforms ofenergyThe absorptionprocess dependson thefrequency,polarization,and promotiondirection of the incidentelectrical waveTheabsorption efficiencyof amaterial istypically characterizedbyits complexpermission andcapabilityThe absorptionmechanism of absorbing materials•Electricalwaveabsorption inmaterialscanoccur throughdifferentmechanisms,such aselectrical relaxation,magnetic resonance,andinternational politicalresonance•Dielectric relaxationoccurs whenthe polesin the material align with theelectric fieldofthe incident wave,leading to energy dissipationthrough internalfriction•Magnetic resonanceoccurs whenthe magneticmoments inthe materialalignwith the magneticfieldoftheincident wave,leading toenergy dissipationthrough heterosislosses•International polarityresponse occurrencesat theinterface betweena polarmaterial anda dielectricmaterial,where theincident electromagnetic wave existssurface polaritiesthat leadtoenergyabsorptionFactors affectingabsorption performanceTheabsorption performanceof aThe chemical composition ofthe Themicrostructure ofthe material,material dependenceon multiplematerial terminalsits electricalsuch asits porosityand grainsize,factors,including itschemical relaxation,magnetic resonance,can significantlyaffect itscomposition,microstructure,and otherabsorption mechanismsabsorption performancethickness,and surfaceroughnessFactors affectingabsorption performanceThethickness ofthe materialeffects thenumber ofabsorptionlayers requiredto achievea desiredabsorptionlevelThe surfaceroughness ofthe materialcan affectitsinteraction with theincidentelectromagneticwave,which affectsits absorption performance03Preparationmethod ofabsorbing materialsCHAPTERSol gel method010203Sol gelmethod is a versatile In this method,precursor Theresulting gel is drivenandprocess for the preparationof solutions are preparedby sinteredat hightemperatures toceramicand glassmaterials Itdissolving metaloxides ormetal producethe final ceramic materialinvolves the conversionofaoxides in appropriate solutionsThe sol-gelmethodallows for thesolution solto agel througha Thesesolutionsarethen preparationof uniform,fineseries ofchemical reactionsand hydrogenized,polymeric,and grainedmaterials withcontrolledphysical processescondensed to form athree microstructuresand compositionsdimensionalnetwork ofsolidparticlesChemical coprecision methodThechemical coprecision In thismethod,precursor The precision is then collected,method is a widely used solutionscontaining thedesired washed,and drivento retainthetechnique for the preparationof solutionsare mixedwith afinalceramicpowder Theceramicpowder It involvestheprecision agentunder controlledchemicalcoprediction methodcontrolledprecision of solutions conditionsTheprecisionagent allowsforthepreparation offromsolution to form apowder causesthe solutionions tocome uniform,fine grainedpowdersmaterial outofsolutionand forma withcontrolled compositionsandprecision particlesizesMicrofusion methodThemicroemulsion methodis aIn thismethod,precursor Themicroemulsion methodversatiletechnique forthe solutionsare mixedwith allowsforthepreparation ofpreparationof nanostructuredsurfactants andco factorstoformuniform,well distributedmaterialsItinvolvesthe useofamicroemulation Thenanostructured powderswithsurfactants andco factorsto microemulsionisthenfree friedcontrolled particlesizes andcreatethermodynamically stable,or otherwiseprocessed toobtain shapesnanoscaledrops ofoil orwater thefinal nanostructuredmaterialdisturbed ina continuousphasePyrolysisPyrolysis isa processin whichInthismethod,the organicThe volatileproducts canbeorganic materialsare composedmaterial isheated quicklyto highcollected andrefined toobtainat hightemperatures inthe temperaturesinacontrolled usefulfuels orchemicals Pyrolysispresenceof oxygenIt isenvironment Theheating involvesisasustainable processforcommonly usedtoconvertthematerial,releasing volatileconverting wastematerials intobiomassor wastematerials intogases andliquids aswell assolid valuableproducts whilereducingusable productssuch aschar coal,charcoal environmentalimpactsgas,and oil04The DevelopmentTrendsandProspects ofAbsorbingCHAPTERMaterialsResearchand development of highperformanceabsorbing materials
1.High performanceabsorbing materialsrefer to
2.The researchand development of highthosematerials thathave excellent absorption performanceabsorbing materialsare mainlypropertiesand canmeet the needs ofspecific focusedon the improvement of absorptionapplications Withthe continuous developmentofefficiency,the reductionof absorptionloss,andscience andtechnology,more andmore hightheimprovement ofabsorptionstability In orderperformance absorbing materialshavebeen toachieve thesegoals,various newtechnologiesdeveloped,such asmetamaterials,carbon andmethods havebeen developed,such asnanotubes,etc geneticalgorithm optimization,numericalsimulation,etcLightweight andThinning ofAbsorbing Materials•Inorderto meettheneedsof modernwarfare andreduce theburdenon carrier vehicles,absorbingmaterialsare consistentlybeingdeveloped inthe directionof lightweightand thinningThis kindofmaterial hasgood absorptionperformance underthe promiseofreducing weightand thickness,which can greatly improvethe survivalofcarriervehiclesin battlefield•The weightand thinningof absorbingmaterials requirethe useof newmaterials andtechnologies Forexample,it canuse thefoaming technologyto reduce the densityof absorbingmaterials,orthemicro nanoprocessingtechnology to reduce thethickness of absorbingmaterialsAt the same time,it alsoneeds toconsider theimpactof lightweightand thinningon theabsorptionperformanceof absorbingmaterialsThe applicationprospects ofabsorbing materialsinstainlesstechnology•Stealth technologyisakey technologyin modernwarfare,which caneffectivelyreducetheradar crosssection andinfrared signatureofaircraft,misses andother weapons,improving theirsurvival inbattlefieldThe absorbingmaterialsareone ofthe importantcomponentsof stainlesstechnology•Inthefuture,withthecontinuousdevelopmentof stainlesstechnology,absorbingmaterialswill playanincreasingly importantrole inmilitary applicationsIn additionto aircraftand misses,absorbingmaterialswillalso bewidelyusedin navalships,ground vehiclesandotherfields Atthesametime,withthecontinuousexpansion ofabsorbingmaterialsapplication fields,it willalso promotethe furtherdevelopmentofabsorbingmaterials05Research progressofabsorbingmaterialsCHAPTERExploration ofNew AbsorbingMaterialsDevelopment of new absorbingResearchon thepreparation andmaterialswith highabsorptionapplication ofabsorbing materialscapacityand fastabsorptionderived fromrenewable resourcesspeedExplorationofnewabsorbingmaterials withgood stabilityanddurabilityOptimization andimprovementofabsorptionperformanceI m p ro v i n gtheImprovi ngth ea b so rp ti onstab ilit ya ndc ap ac it yofd urab ilit yo fab so rb ingab sorb ingmaterials materialsIncreasingtheabsorption speedofabsorbin gmaterialsCompositeapplications ofabsorbingmaterials andother materialsResearchon thecomposite Researchon thecomposite Researchonthecompositeapplication ofabsorbing application ofabsorbingapplicationofabsorbingmaterials andpolymers materialsand ceramicsmaterialsandmetalsTHANKS感谢观看。