Designation:B890−07(Reapproved2012)StandardTestMethodforDeterminationofMetallicConstituentsofTungstenAlloysandTungstenHardmetalsbyX-RayFluorescenceSpectrometry1ThisstandardisissuedunderthefixeddesignationB890;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesaprocedureforthedetermi-nationoftheconcentration,generallyreportedasmasspercent,ofthemetallicconstituentsoftungsten-basedalloysandhardmetalsutilizingwavelengthdispersiveX-rayfluorescencespectrometry(XRF).Thistestmethodincorporatestheprepa-rationofstandardsusingreagentgrademetallicoxides,lithium-boratecompounds,andfusiontechniques.Thistestmethoddetailstechniquesforpreparingrepresentativespeci-mensofbothpowderandsinteredtungsten-basedmaterial.Thistestmethodisaccurateforawiderangeofcompositions,andcanbeusedforacceptanceofmaterialtogradespecifica-tions.1.2Thistestmethodisapplicabletomixturesoftungstenortungstencarbidewithadditionsofrefractorymetalcarbidesandbindermetals.Table1liststhemostcommonelementalconstituentsandtheirconcentrationrange.Notethatmanyoftheseoccurasmetalliccarbides.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E135TerminologyRelatingtoAnalyticalChemistryforMetals,Ores,andRelatedMaterialsE1361GuideforCorrectionofInterelementEffectsinX-RaySpectrometricAnalysis2.2HandbookofChemistryandPhysics,367thed3.Terminology3.1Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyE135.4.SummaryofTestMethod4.1Asuiteofstandardswhichcloselymatchthechemicalcontentofthematerialtobeanalyzedarepreparedusingreagentgrademetallicoxides.Testsamples...
