ASTM C1674-2011 环境温度下带工业孔隙(蜂窝状孔道)的高级陶瓷抗挠强度的标准试验方法

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【英文标准名称】:StandardTestMethodforFlexuralStrengthofAdvancedCeramicswithEngineeredPorosity(HoneycombCellularChannels)atAmbientTemperatures
【原文标准名称】:环境温度下带工业孔隙(蜂窝状孔道)的高级陶瓷抗挠强度的标准试验方法
【标准号】:ASTMC1674-2011
【标准状态】:现行
【国别】:
【发布日期】:2011
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:C28.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:高级陶瓷;催化剂;微孔结构;过滤器;抗弯强度;蜂巢;蜂巢状结构强度;标称横梁强度;孔隙率;墙体断裂强度;多孔材料
【英文主题词】:advancedceramics;catalysts;cellularstructure;filters;flexuralstrength;honeycomb;honeycombstructurestrength;nominalbeamstrength;porosity;wallfracturestrength;Cellularmaterials
【摘要】:Thistestmethodisusedtodeterminethemechanicalpropertiesinflexureofengineeredceramiccomponentswithmultiplelongitudinalhollowchannels,commonlydescribedasx201C;honeycombx201D;channelarchitectures.Thecomponentsgenerallyhave30%ormoreporosityandthecross-sectionaldimensionsofthehoneycombchannelsareontheorderof1millimeterorgreater.Theexperimentaldataandcalculatedstrengthvaluesfromthistestmethodareusedformaterialandstructuraldevelopment,productcharacterization,designdata,qualitycontrol,andengineering/productionspecifications.Note18212;Flexuretestingisthepreferredmethodfordeterminingthenominalx201C;tensilefracturex201D;strengthofthesecomponents,ascomparedtoacompression(crushing)test.Anominaltensilestrengthisrequired,becausethesematerialscommonlyfailintensionunderthermalgradientstresses.Atruetensiletestisdifficulttoperformonthesehoneycombspecimensbecauseofgrippingandalignmentchallenges.Themechanicalpropertiesdeterminedbythistestmethodarebothmaterialandarchitecturedependent,becausethemechanicalresponseandstrengthoftheporoustestspecimensaredeterminedbyacombinationofinherentmaterialpropertiesandmicrostructureandthearchitectureofthechannelporosity[porosityfraction/relativedensity,channelgeometry(shape,dimensions,cellwallthickness,etc.),anisotropyanduniformity,etc.]inthespecimen.Comparisonoftestdatamustconsiderbothdifferencesinmaterial/compositionpropertiesaswellasdifferencesinchannelporosityarchitecturebetweenindividualspecimensanddifferencesbetweenandwithinspecimenlots.1.1Thistestmethodcoversthedeterminationoftheflexuralstrength(modulusofruptureinbending)atambientconditionsofadvancedceramicstructureswith2-dimensionalhoneycombchannelarchitectures.1.2Thetestmethodisfocusedonengineeredceramiccomponentswithlongitudinalhollowchannels,commonlycalledx201C;honeycombx201D;channels.(SeeFig.1.)Thecomponentsgenerallyhave30%ormoreporosityandthecross-sectionaldimensionsofthehoneycombchannelsareontheorderof1millimeterorgreater.Ceramicswiththesehoneycombstructuresareusedinawiderangeofapplications(catalyticconversionsupports(1),hightemperaturefilters(2,3),combustionburnerplates(4),energyabsorptionanddamping(5),etc.).Thehoneycombceramicscanbemadeinarangeofceramiccompositionsalumina,cordierite,zirconia,spinel,mullite,siliconcarbide,siliconnitride,graphite,andcarbon.Thecomponentsareproducedinavarietyofgeometries(blocks,plates,cylinders,rods,rings).1.3Thetestmethoddescribestwotestspecimengeometriesfordeterminingtheflexuralstrength(modulusofrupture)foraporoushoneycombceramictestspecimen(seeFig.2):1.3.1TestMethodA8212;A4-pointor3-pointbendingtestwithuser-definedspecimengeometries,and1.3.2TestMethodB8212;A4-point-x00BC;pointbendingtestwithadefinedrectangularspecimengeometry(13mmx00D7;25mmx00D7;>116mm)anda90mmoutersupportspangeometrysuitableforcordieriteandsiliconcarbidehoneycombswithsmallcellsizes.