【英文标准名称】:CARAVANS.PAYLOAD.
【原文标准名称】:旅游挂车.有用负荷
【标准号】:NFS56-102-1985
【标准状态】:作废
【国别】:法国
【发布日期】:1985-12
【实施或试行日期】:1985-11-20
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:有效荷载;居住挂车;受牵引车辆
【英文主题词】:usefulloads;usefulload;towedroadvehicles;caravans
【摘要】:
【中国标准分类号】:T70
【国际标准分类号】:
【页数】:2P;A4
【正文语种】:其他


【英文标准名称】:StandardTestMethodforAdvancedCeramicSpecificSurfaceAreabyPhysicalAdsorption
【原文标准名称】:用物理吸收法测定高级陶瓷比表面积的标准试验方法
【标准号】:ASTMC1274-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【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】:C28.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:高级陶瓷;高比表面积;陶瓷;氪气吸收;多点表面面积;氮气吸收;脱气;物理吸附;单点表面面积;比表面积;表面面积;
【英文主题词】:advancedceramics;BETsurfacearea;ceramics;kryptonadsorption;multipointsurfacearea;nitrogenadsorption;outgassing;physicaladsorption;singlepointsurfacearea;specificsurfacearea;surfacearea
【摘要】:Advancedceramicpowdersandporousceramicbodiesoftenhaveaveryfineparticulatemorphologyandstructurethataremarkedbyhighsurface-to-volume(S-V)ratios.TheseceramicswithhighS-Vratioscommonlyexhibitenhancedchemicalreactivityandlowersinteringtemperatures.Resultsofmanyintermediateandfinalceramicprocessingstepsarecontrolledby,orrelatedto,thespecificsurfaceareaoftheadvancedceramic.Thefunctionalityofceramicadsorbents,separationfiltersandmembranes,catalysts,chromatographiccarriers,coatings,andpigmentsoftendependsontheamountanddistributionoftheporosityanditsresultingeffectonthespecificsurfacearea.Thistestmethoddeterminesthespecificsurfaceareaofadvancedceramicpowdersandporousbodies.Bothsuppliersandusersofadvancedceramicscanuseknowledgeofthesurfaceareaoftheseceramicsformaterialdevelopmentandcomparison,productcharacterization,designdata,qualitycontrol,andengineering/productionspecifications.1.1Thistestmethodcoversthedeterminationofthesurfaceareaofadvancedceramicmaterials(inasolidform)basedonmultilayerphysisorptionofgasinaccordancewiththemethodofBrunauer,Emmett,andTeller(BET)(1)andbasedonIUPACRecommendations(1984and1994)(2)and(3).Thistestmethodspecifiesgeneralproceduresthatareapplicabletomanycommercialphysicaladsorptioninstruments.Thistestmethodprovidesspecificsampleoutgassingproceduresforselectedcommonceramicmaterials,including:amorphousandcrystallinesilicas,TiO2,kaolin,siliconnitride,siliconcarbide,zirconiumoxide,etc.ThemultipointBET(1)equationalongwiththesinglepointapproximationoftheBETequationarethebasisforallcalculations.Thistestmethodisappropriateformeasuringsurfaceareasofadvancedceramicpowdersdowntoatleast0.05m2(ifinadditiontonitrogen,kryptonat77.35Kisutilizedasanadsorptive).1.2Thistestmethoddoesnotincludeallexistingproceduresappropriateforoutgassingofadvancedceramicmaterials.However,itprovidesacomprehensivesummaryofproceduresrecommendedintheliteratureforselectedtypesofceramicmaterials.Theinvestigatorshalldeterminetheappropriatenessoflistedprocedures.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.StateallnumericalvaluesintermsofSIunitsunlessspecificinstrumentationsoftwarereportssurfaceareausingalternateunits.Inthiscase,providebothreportedandequivalentSIunitsinthefinalwrittenreport.Itiscommonlyacceptedandcustomary(inphysicaladsorptionandrelatedfields)toreportthe(specific)surfaceareaofsolidsasm2/g,and,asaconvention,manyinstruments(aswellascertificatesofreferencematerials)reportsurfaceareaasm2g-1,insteadofusingSIunits(m2kg-1).1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:
【国际标准分类号】:81_060_99
【页数】:9P.;A4
【正文语种】: