1、INTERNATIONA1.STANDARDISO4491-2editionThid2023-04Meta1.1.icpowdersDeterminationofoxygencontentbyreductionmethods一忸即Nfmassonhydrogenreduction(hydrogen1.oss)Poudresmeta1.1.iques-Dosagedeoxyginepar1.esmethodesdereductionPartie2:Pertedemasseparreductiondanshydrogene(pertedanshydrogine)ReferencenumberIS0
2、449b2:2023(E)Contentsforeword2ScopeoNormativereferencesTermsanddefinitionsReagentsandmateria1.sApparatusGenera1.Ba1.anceCuEnghfubeThermocoup1.eBoatSanip1.ingProcedure7.1 Genera1.7.2 TestprocedureCa1.cu1.ationandexpressionoftestresu1.ts10M051,00,01max.S%fmean1,0),01max.5%ofmean0.19P麴哪胪s*Ca1.cu1.ation
3、oftestresu1.tstothenearestMaximumpermissib1.edifferencebetweentwodetemina*tionsExpressionofresu1.tstothenearestITietafpWUc!r,JiceiaDtC3CTtrfT11vttttWtrfmrfHCTratn三ttjr5ttttiJrTOrtwHwm7-wpWCrStftCHt3Tpetcct-Ht-tfw-tftwiMatMHsawfy-sftPnuzdArtvvAPureatomizedironpowderSpongeironpowderWateratomizedcopper
4、powderTungstenpowderInTah1.e4,therTpMefcrtttjnndReatai1.iit)1)M)4eprniMm9(sstandarddeviatis,iation.Testedpowder1.eVe1.AverageH?1.ossRepeatabIIityfSr)StandarddeviationReproducibi1.1.ty(SRStandarddeviationWateratomizedcopperpowder0,180,0200,037TUn承州H）物附6ssCa1.cu1.ationoftest11(MftstothenearestMaximum脚
5、面SSibICdifferencebetweentwodeteminationsEHssionofresu1.tstothenearest5C)ISO2023-A1.1.rightsreseapparatusWithinbetweenshortesttestfeasib1.efoundintenra1.identica1.exceedma1.eria1.repea1.abi1.ityoperatorUSingTab1.e5,reproducibi1.ityidentica1.testmateria1.onreportednotmore1.aboratorieswi1.1.differbymor
6、enorma1.andTab1.e5Repeatabi1.ityandReproducibi1.ity,differencebetveentwotestsat95%probabi1.ity1.eve1.AverageH-1.oss1.imit1.imitWateratomizedcopperpowder0r180.0570.103Theprecisionyear2020determinedfmmanexperimentorganizedinvestigationaccordancewithTheparticipatingparticipatingusedshdywereequipmentthe
7、funace,proceduredescribedforISO4491-2.IOTestreporta)areferencetothisdoment,i.e.ISO4491-2:2023;c)thetestresu1.tsobtained；e) detai1.sofanyoccurrencewhichmayhaveaffectedtheresu1.tsThedifferencethetworesu1.tstimeonwi1.1.testtheone1.imit(r),seethesameonaveragenotmorethanoncein20casesinthenorma1.andcorre
8、ctoperationofthemethod.Testresu1.tson1.imit(J),Tab1.e5,averagebytwothanoncein20casesinthethanthecorrectoperationofthemethodtheandana1.ysedinwasana1.ysedtwoISO5725-2datawerewhereeachthepowdersinc1.udedtimesby71.aboratories.testsca1.eandboats)inthestudy.111.aboratories1.aboratoriesintheirowntestfo1.1.
9、owingThetestreportsha1.1.inc1.udethefo1.1.owinginformation:b)a1.1.detai1.snecessaryfortheidentificationofthetestsamp1.e;d)detai1.sofanyoperationsnotspecifiedinthisdocument,orregardedasoptiona1.;f) thedateofthetest.AnnexAInterpretationofresu1.tsA.1.contribute,positive1.ycomp1.exnegative1.y1.1.oyedmea
10、suredit1.ossnowthoughtthatfo1.1.owingchemica1.changescanA.2A.3.4A.5compounds.Examp1.esarecarbon,nitrogen,phosphorusandsu1.fur.A.6A.7reducedbycarbonunderthespecifiedtestconditions,8duringthetest).A.9ISO2023-A1.1.nghtsreserved(informative)7characteristicthatmassofPowderusefu1.hydiogenprocessingcommon1
11、ymeta1.1.urgica1.materiakpowderorigina1.1.yconsideredtobeanestimateoftheoxygencontentofhydrogen-reducib1.eoxidesbut,withtheadventofmoreorandtoChepowders1.isinmass.Thus,Cheotherfactorsshou1.dbeconsideredwheninterpretingexperimenta1.resu1.ts.1.z3,MgOzmeasured1.ossTiOmasswhicharenotnotreducib!eoxygenp
12、resenttestnditions.oxidessuchasSiO2.The1.ossofmassinc1.udesanywatervapourand/orhydrocarbonspresentinthepowder.The1.ossofmassinc1.udesgaseswhich,owingtoeitheradsorptionorocc1.usion,canbepresentinthepowderandwhichare1.iberatedduringheating.Theamountofsuchgasesisnorma1.1.yneg1.igib1.e.whichUnder1.ossth
13、eofspecifiedindudesconditionspartia1.1.ycomp1.ete1.yremoved,eitherbecausepowderandvo1.ati1.eorbecausetheyreactwiththehydrogenorWithoxidespresentinthepowdertoformvo1.ati1.eThe1.ossofmassinc1.udesmeta1.swhicharepresentinthepowderandwhichunderthespecifiedtestconditionsarevo1.ati1.eandthereforepartia1.1
14、yorcomp1.ete1.yremovedduringthetest.1.ead,zincandcadmiumareexamp1.esofsuchmeta1.s.oxygenCarhonoxidespresentunde)owder,specified1.ossofconditionsarehydrogenIosscarbonxanExampIesofsuchoxidesareCr2O3andMnOwhich,whenpresentincarbon-containingstee1.powders,canbePowderscontainingmanganeseand/orchromiunor
15、othere1.ementswithahighaffinityforoxygen,canbeoxidizedduringthetestbytheatmosphereorthroughreductionof1.essrefractoryoxides.Inextremecasesthiscanresu1.tinanegativefigureforhydrogen1.oss(i.e.anincreaseofmassTheresu1.tscanbeinf1.uencedbythepresenceofreducib1.e,oxidizab1.eorvo1.ati1.emeta1.s,meta1.1.oidsorcompounds.Theresu1.tsobtainedonsuchpowdersshou1.dbeusedwithcautionandIheirinterpretationshou1.dbesubjecttoagreementbetweensupp1.ieranduser.Bib1.iography1Dt449powdersDeterminationofoxygencontentbyreductionmethods2俺七夕冽忸他射做冲函/网怫1理族网硕5股”的觎硒施M湘3网。股5哪1.3enrmethodICS77.160
