ASTM_B_855_-_17.pdf

Designation:B85517Standard Test Method forVolumetric Flow Rate of Metal Powders Using the ArnoldMeter and Hall Flowmeter Funnel1This standard is issued under the fixed designation B855;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers a laboratory procedure for thequantitative determination of the flow rate of a specific volumeof a free-flowing metal powder or lubricated powder mixture.1.2 With the exception of the values for mass,volume anddensity,for which the use of the gram and the cubic centimetreunit is long-standing industry practice,the values stated ininch-pound units are to be regarded as standard.The valuesgiven in parenthesis are mathematical conversions to SI unitsthat are provided for information only and are not consideredstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2B213 Test Methods for Flow Rate of Metal Powders Usingthe Hall Flowmeter FunnelB215 Practices for Sampling Metal PowdersB243 Terminology of Powder MetallurgyB703 Test Method for Apparent Density of Metal Powdersand Related Compounds Using the Arnold MeterE456 Terminology Relating to Quality and Statistics2.2 MPIF Standard3MPIF Standard 48 Determination of Apparent Density ofMetal Powders using the Arnold Meter3.Terminology3.1 DefinitionsUseful definitions of terms for metal pow-ders and powder metallurgy used in this standard are found inTerminology B243.Additional descriptive PM information isavailable in the Related Material section of Vol 02.05 of theAnnual Book of ASTM Standards.3.2 Definitions of Terms Specific to This Standard:3.2.1 volumetric flow ratethe relation between time andvolume of a free-flowing metal powder determined by mea-suring the time for a specific volume to flow through the orificein a Hall Flowmeter Funnel and expressing the ratio in secondsper 20 cubic centimetres.(s/20 cm3).4.Summary of Test Method4.1 A20 cm3test portion of powder is prepared from the lotto be tested following the procedures in Test Methods B215and B703.4.2 This 20 cm3test portion is timed as it flows through theorifice in a Hall Flowmeter Funnel following the procedure inTest Method B213.4.3 The volumetric flow rate is calculated and reported inseconds per 20 cubic centimetres.(s/20 cm3)5.Significance and Use5.1 The volumetric flow rate is a measure of the flowcharacteristics of a metal powder.Measuring flow by volumeas compared with flow per unit mass eliminates the variable ofthe powder density and relates to the production practice of diefilling by volume.5.2 The ability of a powder to flow and pack is a function ofinterparticle friction.As the surface area increases,the amountof friction in a powder mass also increases.Consequently,thefriction between particles increases,giving less efficient flowand packing.1This test method is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.02 on Base Metal Powders.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 1994.Last previous edition approved in 2011 as B855 11.DOI:10.1520/B0855-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from ASTM or Metal Powder Industries Federation,105 CollegeRoad East,Princeton,NJ 08540 and initially reported in MPIF Standard 48*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.3 Knowledge of the volumetric flow rate permits the partproducer to estimate the number of parts that can be compactedper hour.5.4 This test may be part of the purchase a