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【英文标准名称】:Advancedtechnicalceramics-Monolithicceramics-Generalandtexturalproperties-Determinationofphasevolumefractionbyevaluationofmicrographs
【原文标准名称】:高技术陶瓷.整体陶瓷.一般的和表面结构特性.通过显微摄影图评估测定相体积分数
【标准号】:BSDDENV623-5-2002
【标准状态】:现行
【国别】:英国
【发布日期】:2002-08-05
【实施或试行日期】:2002-08-05
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:粒径分析;组织;试验设备;缩微照相;试样制备;高级工业陶瓷;陶瓷;粒度;蒸馏物;试验;质量;仪器;显微摄影;特性;定义;结构;单片材料;测定;数学计算
【英文主题词】:
【摘要】:ThisEuropeanPrestandardspecifiesamanualmethodofmakingmeasurementsforthedeterminationofvolumefractionofmajorphasesinadvancedtechnicalceramicsusingmicrographsofpolishedandetchedsections,overlayingasquaregridoflines,andcountingthenumberofintersectionslyingovereachphase.NOTE1Thismethodassumesthatthetruephasevolumefractionsareequivalenttoareafractionsonarandomlycutcrosssectionaccordingtostereologicalprinciples.NOTE2GuidelinesforpolishingandetchingofadvancedtechnicalceramicscanbefoundinannexesAandB.Themethodappliestoceramicswithoneormoredistinctsecondaryphases,suchasfoundinAl2O3/ZrO2,Si/SiC,orAl2O3/SiCw.Ifthetestmaterialcontainsdiscretepores,thesecanbetreatedasasecondaryphaseforthepurposeofthismethodprovidedthatthereisnoevidenceofgrainpluck-outduringpolishingbeingconfusedwithgenuinepores.NOTE3Ifthematerialcontainsmorethanabout20%porositythereisastrongriskthatthemicrostructurewillbedamagedduringthepolishingprocess,andmeasurementofvolumefractionofporesmaybecomemisleading.Secondaryphasevolumefractionsorporositypresentatlevelsoflessthan0,05aresubjecttoconsiderableerrorandpotentialscatterinresults.Alargernumberofmicrographsthantheminimumofthreeisnormallyneededtoimprovetheconsistencyandaccuracyoftheresults.NOTE4Manyceramicscontainsmallamountsofsecondaryglassyphases.Inordertomakeareasonableestimateofglassyphasecontent,theglassmaterialbetweencrystallinegrainsshouldbereadilyobservable,andthusshouldbeatleast0,5μminwidth.ThemethodinthisPrestandardisnotconsideredappropriatefornarrowglassyfilmsaroundgrains.Thismethodassumesthattheselectedregionsofapreparedcross-sectionarestatisticallyrepresentativeofthewholesampledsection.NOTE5Microstructuresareseldomhomogeneous,andthephasecontentscanvaryfrommicrographtomicrograph.Itisessentialtosurveyasufficientlywideareaofthepreparedsectiontoensurethatthoseareasselectedforevaluationarerepresentative,anddonotcontainingeye-catchingirregularities.SomeusersofthisPrestandardcanwishtoapplyautomaticorsemiautomaticimageanalysistomicrographsordirectlycapturedmicrostructuralimages.ThisiscurrentlyoutsidethescopeofthisPrestandard,butsomeguidelinesaregiveninannexC.
【中国标准分类号】:Q32
【国际标准分类号】:81_060_30
【页数】:22P;A4
【正文语种】:英语


【英文标准名称】:Electricalinstallationsofbuildings-Part5:Selectionanderectionofelectricalequipment;Chapter52:Wiringsystems;AmendmentA1;GermanversionHD384.5.52S1:1995/A1:1998
【原文标准名称】:建筑物的电气设施.第5部分:电气设备的选择和安装.第52章:线路系统(设备).修改件A1
【标准号】:DINVDE0100-520/A1-1999
【标准状态】:作废
【国别】:德国
【发布日期】:1999-01
【实施或试行日期】:1999-01-01
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:电缆系统;导电体;敷设;电驱动装置;规范(验收);电力设备;电气设备;安装;建筑物服务设施;型式;电工导管;电缆;电缆;电气工程;选择;建筑物;系统;电压降;载流量;接触轨;电力装置;电气布线系统;管路
【英文主题词】:
【摘要】:
【中国标准分类号】:P91
【国际标准分类号】:91_140_50
【页数】:6P;A4
【正文语种】:德语