【英文标准名称】:StandardPracticeforDeterminingVacuumChamberGaseousEnvironmentUsingaColdFinger
【原文标准名称】:用冷凝管测定真空室气态环境的标准实施规程
【标准号】:ASTME834-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:coldfinger;contaminationmonitoring;residualgascompositions;vacuumchamber;Coldfingermethod;Gases;Samplingaerospacematerials;Temperaturetests--aircraft/aerospacematerials;Vacuumtesting--aerospacematerials;Aerospaceapplications
【摘要】:Whenappliedinthecaseinwhichthereisnotestiteminthevacuumchamber(suchasduringbake-outoperations),thisproceduremaybeusedtoevaluatetheperformanceofthevacuumchamberinrelationtootherdatafromthesameorotherchambersgiventhatcriticalparameters(forexample,lengthofexposure,temperatureofthechamberandcoldfinger,anisotropy,andsoforth)canberelated.Theprocedurecanbeusedtoevaluatetheeffectsofmaterialsfoundintheresidueonitemsplacedinthevacuumchamber.Theprocedurecanbeusedtodescribetheeffectofapriortestontheresidualgaseswithinavacuumchamber.Byselectingthetimeatwhichthecoolantisintroducedintothecoldfinger,theenvironmentpresentduringaselectedportionofatestcanbecharacterized.Thiscanbeusedtodeterminetherelativeefficacyofcertainvacuumchamberproceduressuchasbake-out.Theproceduremaybeusedtodefinetheoutgassedproductsofatestitemthatcondenseonthecoldfinger.Theproceduremaybeusedindefiningtherelativecleanlinessofavacuumchamber.Inapplyingtheresultsoftheproceduretothevacuumchamberingeneral,considerationmustbegiventotheanisotropyofthemolecularfluxeswithinthechamber.Theprocedureissensitivetoboththepartialpressuresofthegasesthatformthecondensiblesandthetimeofexposureofthecoldfingeratcoolanttemperatures.Theprocedureissensitivetoanylossesofsamplethatmayoccurduringthevarioustransferoperationsandduringthatprocedurewhereinthesolventisevaporatedbyheatingitonasteambath.Note18212;Reactionsbetweensolventandcondensatecanoccurandwouldaffecttheanalysis.1.1Thispracticecoversatechniqueforcollectingsamplesofmaterialsthatarepartoftheresidualgasenvironmentofanevacuatedvacuumchamber.Thepracticeusesadevicedesignatedasax201C;coldfingerx201D;thatisplacedwithintheenvironmenttobesampledandiscooledsothatconstituentsoftheenvironmentareretainedonthecold-fingersurface.1.2Thepracticecoversamethodforobtainingasamplefromthecoldfingeranddeterminingtheweightofthematerialremovedfromthecoldfinger.1.3Thepracticecontainsrecommendationsastowaysinwhichthesamplemaybeanalyzedtoidentifytheconstituentsthatcomprisethesample.1.4Bydeterminingthespeciesthatconstitutethesample,thepracticemaybeusedtoassistindefiningthesourceoftheconstituentsandwhetherthesampleisgenerallyrepresentativeofsamplessimilarlyobtainedfromthevacuumchamberitself.1.5Thispracticecoversalternativeapproachesandusagestowhichthepracticecanbeput.1.6Thedegreeofmolecularfluxanisotropysignificantlyaffectstheassurancewithwhichonecanattributecharacteristicsdeterminedbythisproceduretothevacuumchamberenvironmentingeneral.1.7Thetemperatureofthecoldfingersignificantlyaffectsthequantityandspeciesofmaterialscollected.1.8ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.9Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificwarningstatements,seeSection8.
【中国标准分类号】:J78
【国际标准分类号】:23_160
【页数】:4P.;A4
【正文语种】:英语