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【英文标准名称】:StandardTestMethodforTotalMassLossandCollectedVolatileCondensableMaterialsfromOutgassinginaVacuumEnvironment
【原文标准名称】:真空环境中放气引起的总质量损失及收集的挥发性可凝结物的测定用标准试验方法
【标准号】:ASTME595-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E21.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:航空航天运输;材料;航天技术;测试;真空的;挥发性的
【英文主题词】:CollectedVolatileCondensableMaterial(CVCM);materialselection;materialtest;Outgassing;screeningtest;spacecraftmaterials;TotalMassLoss(TML);VolatileCondensableMaterials(VCM)
【摘要】:Thistestmethodevaluates,undercarefullycontrolledconditions,thechangesinthemassofatestspecimenonexposureundervacuumtoatemperatureof125x00B0;Candthemassofthoseproductsthatleavethespecimenandcondenseonacollectoratatemperatureof25x00B0;C.The24htesttimedoesnotrepresentactualoutgassingfromyearsofoperation,soahighertesttemperatureshortertimewasselectedtoallowmaterialcomparisonswithnointenttopredictactualoutgassinginservice.Thetesttemperatureof125x00B0;Cwasassumedtobesignificantlyabovetheexpectedoperatingtemperatureinservice.Ifexpectedoperatingtemperaturesexceed65to70x00B0;Cthetesttemperatureshouldbeincreased.Itissuggestedthattesttemperaturebeatleast30x00B0;ChigherthanexpectedmaximumservicetemperatureinordertoprovidematerialcomparisonsforTMLandCVCM.Comparisonsofmaterialoutgassingpropertiesarevalidat125x00B0;Csampletemperatureand25x00B0;Ccollectortemperatureonly.Samplestestedatothertemperaturesmaybecomparedonlywithothermaterialswhichweretestedatthatsametemperature.Themeasurementsofthecollectedvolatilecondensablematerialarealsocomparableandvalidonlyforsimilarcollectorgeometryandsurfacesat25x00B0;C.Sampleshavebeentestedatsampletemperaturesfrom50to400x00B0;Candatcollectortemperaturesfrom1to30x00B0;Cbythistesttechnique.Datatakenatnonstandardconditionsmustbeclearlyidentifiedandshouldnotbecomparedwithsamplestestedat125x00B0;Csampletemperatureand25x00B0;Ccollectortemperature.Thesimulationofthevacuumofspaceinthistestmethoddoesnotrequirethatthepressurebeaslowasthatencounteredininterplanetaryflight(forexample,10x2212;12Pa(10x2212;14torr)).Itissufficientthatthepressurebelowenoughthatthemeanfreepathofgasmoleculesbelongincomparisontochamberdimensions.Thismethodofscreeningmaterialsisconsideredaconservativeonebecausemaximumoperatingtemperaturesinserviceareassumednottoexceed50to60x00B0;Cformostapplications.Itispossiblethatafewmaterialswillhaveacceptablepropertiesattheintendedusetemperaturebutwillbeeliminatedbecausetheirpropertiesarenotsatisfactoryatthetesttemperatureof125x00B0;C.Also,materialsthatcondenseonlybelow25x00B0;Carenotdetected.Theusermaydesignateadditionalteststoqualifymaterialsforaspecificapplication.ThedeterminationsofTMLandWVRareaffectedbythecapacityofthematerialtogainorlosewatervapor.Therefore,theweighingsmustbeaccomplishedundercontrolledconditionsof23x00B0;Cand50%relativehumidity.Alternatively,allspecimensmaybeputintoopenglassvialsduringthe24-htemperatureandhumidityconditioning.Thevialsmustbecappedbeforeremovalfromtheconditioningchamber.Eachspecimenmustbeweighedwithin2minafteropeningthevialtominimizethelossorabsorptionofwatervaporwhileexposedtoanuncontrolledhumidityenvironment.Whilecontrolofhumidityisnotnecessaryatthispoint,thetemperaturefortheweighingshouldbecontrolledat23x00B0;C,thesametemperatureprescribedfort......
【中国标准分类号】:V10
【国际标准分类号】:
【页数】:9P.;A4
【正文语种】:


【英文标准名称】:Specificationforgalvanizedmildsteelindirectcylinders,annularorsaddle-backtype.Metricunits
【原文标准名称】:环型或马鞍型镀锌低碳钢间接热水罐规范.第2部分:公制单位
【标准号】:BS1565-2-1973
【标准状态】:作废
【国别】:英国
【发布日期】:1973-03-15
【实施或试行日期】:1973-03-15
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:孔;蓄水池;管接头;试验压力;水加热器;封盖物;曲率;作标记;尺寸;低碳钢;国际单位制;体积;镀锌;螺纹管接头;热水罐;环形;半径;曲线的;球冠;家用的;工作压力;位置;等级(质量);钢;名称与符号;厚度
【英文主题词】:
【摘要】:
【中国标准分类号】:Q83
【国际标准分类号】:91_140_60
【页数】:16P;A4
【正文语种】:英语