Designation:B243−16aStandardTerminologyofPowderMetallurgy1ThisstandardisissuedunderthefixeddesignationB243;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisterminologystandardincludesdefinitionsthatarehelpfulintheinterpretationandapplicationofpowdermetal-lurgyterms.2.ReferencedDocuments2.1ASTMStandards:B331TestMethodforCompressibilityofMetalPowdersinUniaxialCompaction3.Terminology3.1Definitions:acicularpowder,n—needle-shapedparticles.activatedsintering,v—asinteringprocessduringwhichtherateofsinteringisincreased,forexample,byadditionofasubstancetothepowderorbychangingsinteringconditions.agglomerate,n—severalparticlesadheringtogether.airclassification,n—theseparationofpowderintoparticlesizefractionsbymeansofanairstreamofcontrolledvelocity.angleofrepose,n—thebasalangleofapileformedbypowderwhenfreelypouredunderspecifiedconditionsontoahori-zontalsurface.apparentdensity,n—themassofaunitvolumeofpowder,usuallyexpressedasgramspercubiccentimetre,determinedbyaspecifiedmethod.apparenthardness,n—thehardnessofaPMmaterial(includ-ingtheeffectsofporosity),measuredusingmacroindenta-tionhardnessequipment.DISCUSSION—Seegeneraldescriptionofproduction,properties,andusesofsinteredmetalpowderbearingsandstructuralparts,paragraphondensityandmechanicalproperties,informationonhardnessmeasurement,Volume02.05.2apparentporosity,n—specifictocementedcarbides,micro-structuralfeaturesthatappeartobeporesinaproperlyprepared,unetchedsurface;thesefeaturesmayresultfromuncombinedcarbonornonmetallicinclusionsaswellasactualporosity.atomization,n—thedispersionofamoltenmetalintoparticlesbyarapidlymovinggasorliquidstreamorbymechanicalmeans.atomizedmetalpowder,n—metalpowderproducedbythedispersionofamoltenmetalbyarapidlymovinggas,orliquidstream,orbymechanicaldispersionblank,n—apr...
