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Ceramics:GeneralIntroduction1Lecture61?
2WhyCeramics?Asmallbearingthatislight,rigid,hardandresistshightemperaturesAnelectricalinsulatortobeusedathightemperaturesAtransparentbakingdishSurfaceofspaceshuttleorbiter(madeofaluminum)whichisexposedto1450oC2?
3IntroductionCeramicsareinorganiccompoundsofmetallicandnon-metallicelements.Generallyknownas‘Clayproducts’Ordinary glass: 74% SiO2, 16% Na2O, 5% CaO,1%Al2O3and4%MgO.Examples:Metalandnonmetal:MgO;NMESandnonmetal:SiO2;MetalandNMES:TiC,ZrB2,MoSi2;TwoNMES:SiC,Si3N4;Othernon-binaryceramics:BaTiO3,YBa2Cu3O7,PbZrO3;3?
ClassificationofCeramicsBasedonTheirApplicationsBasicGlassesClayproductsRefractoriesAbrasivesCementsAdvancedCeramicsGlassesGlassceramicsStructuralClayProductsWhitewaresFireClaySilicaSpecialCeramics4?
5CharacteristicsofCeramicsLowdensitycomparedtometalsHighmeltingpointordecompositiontemperatureHighhardnessandverybrittleHighelasticmodulusandmoderatestrengthLowtoughnessHighelectricalresistivityLowthermalconductivityHightemperaturewearresistanceThermalshockresistanceHighcorrosionresistanceIncrystallineceramicsthecrackpropagationisusuallythroughthegrains(transgranular)andalongspecificcrystallographic(orcleavage)planes,whichareplanesofhighatomicdensityMaindrawbackisbrittlenessandlowtoughness5?
PEMPEMM2512SurfaceCompressionTemperingglass-solidifyingsurfacequickly,andallowinginteriortocoolslowly-putsinteriorintensionandsurfaceincompressionIonexchangereplacesmallionswithlargeions(e.gK+forNa+)atthesurface.CompressionzoneTensilezone Compressionzone96?
Cutthe?glass?intothedesiredshapewikihowInspectthe?glass?forimperfectionsSandthecutedgessmoothWashthe?glassHeatthe?glass?ina?tempering?ovenQuenchthe?glass?tocoolitHowtomaketemperedglass?7
StrengtheningofCeramicsAllceramicmaterials,dueto
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