超高真空环境下测试产品的放气分析

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1、第27卷第6期航天器环境工程2010年12月SPACECRAFTENVIRONMENTENGINEERING735Outgassinganalysisoftestingproductsinultra-highvacuumWangLi，SunLichen，YanRongxin，LiuEnjun，ShiJijun，ZhangHaifeng，SunLizhi(BeijingInstituteofSpacecraftEnvironmentEngineering，Beijing100094，China)Abstract：Thispaperdiscussesthetheoryandmo

2、delsofmaterialsoutgassing．Theoreticaloutgassingratesoftypical(cylindrical)testingproductsareobtainedbyusingFick’slaw．Twomethodsofmeasuringtheoutgassingrateareproposed,whichaletheconstantvolumemethodandtheorificethroughputmethod．Threeproblemsoftheorificethroughputmethodareanalyzedandsolvedb

3、ythetwingaugethroughput(TGT)method．Keywords：ultra—highvacuum；outgassing；constantvolumemethod；orificethroughputmethod；TGTmethodCLCnumber：TB774Documentcode：AArticleID：1673-1379(2010)06-0735·04DOI：10．39690．issn。1673—1379．2010．06．0150IntroductionItisknownthateverysolidmateriaIcandissolveandabs

4、orbsomegasesintheatmosphere．Whenthesematerialsareputintoavacuumchamber(asanenvironment)，theywillgiveofftheadsorbedordissolvedgasesandvapors，whichiscalledoutgassing⋯．Outgassingintheultra—highvacuumsystemincludesoutgassingofultra-highvacuumfacilityandoutgassingoftestingproducts，andthelattero

5、fwhichisanalyzedinthispaper．Manytestingproductsofspacecraft,suchasdrivingframework，relayandconversionswitch，areoftenputintotheultra-highvacuumfacilitytotesttheirproperties．Theoutgassingofthesetestingproductsisnotonlyrelatedwiththepropertiesofmaterials，butalsowiththeprocessoftheirmanufactur

6、e,storageconditionsandotherfactors．1Outgassingtheoryandmodels1．1OutgassingtheoryTheoutgassingofamaterialreferstothenetquantityofgasleavingthematerialsanditsingredientsincertainconditions(pressure，temperature，time)，includingtotalquantityofoutgassingandpartialquantityofoutgassinggascomponent

7、s12J．Thereleasedgasfromtestingproductscanbetrackedintwosteps．Thefirstisrelatedtothediffusionofgasfromthetestingproducts；thesecondisrelatedtothedesorptionfromtheadsorbedgasatthesurfaceoftesting十·斗+十+productsL“．DiffusionFig．1Schematicdiagramofdcsorption．anddesor