1、Designation:B21317Standard Test Methods forFlow Rate of Metal Powders Using the Hall FlowmeterFunnel1This standard is issued under the fixed designation B213;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the determination of a flow
3、rate,by the use of the Hall Flowmeter funnel of metal powders andpowder mixtures.It is suitable only for those powders that willflow unaided through the Hall Flowmeter funnel.1.2 With the exception of the values for density and themass used to determine density,for which the use of the gramper cubic
4、 centimetre(g/cm3)and gram(g)units is the long-standing industry practice,the values in inch-pound units are tobe regarded as standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only,and are not considered standard.1.3 This standard does
5、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 devel
6、oped 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 Document
7、s2.1 ASTM Standards:2B215 Practices for Sampling Metal PowdersB243 Terminology of Powder MetallurgyB855 Test Method for Volumetric Flow Rate of MetalPowders Using the Arnold Meter and Hall FlowmeterFunnelB964 Test Methods for Flow Rate of Metal Powders Usingthe Carney Funnel3.Terminology3.1 Definiti
8、onsDefinitions of powder metallurgy termscan be found in Terminology B243.3.2 Definitions of Terms Specific to This Standard:3.2.1 Hall flow rate(FRH),nthe time required for a metalpowder sample of specified mass to flow through the orifice ina Hall Flowmeter funnel according to a specified procedur
9、e.4.Summary of Test Method4.1 A weighed mass(50.0 g)of metal powder is timed as itflows through the orifice of a calibrated Hall Flowmeter funnel.5.Significance and Use5.1 The rate and uniformity of die cavity filling are relatedto flow properties,which thus influence production rates anduniformity
10、of compacted parts.5.2 The ability of a powder to flow is a function ofinterparticle friction.As interparticle friction increases,flow isslowed.Fine powders may not flow.Some powders,often finepowders and lubricated powder mixtures,may not flowthrough the Hall Flowmeter funnel.Nevertheless,if a larg
11、erorifice is provided,such as in the Carney Flowmeter funnel ofTest Method B964,a meaningful flow rate may be determined,providing specific information for certain applications.5.3 Test Method B213,using the Hall Flowmeter funnel,isthe preferred method for determining the flowability of metalpowders
12、 and powder mixtures.The Carney Flowmeter funnelof Method B964 should only be used when powder will notflow through the Hall Flowmeter funnel.5.4 Humidity and moisture content influence flow rate.Wetor moist powders may not flow.5.5 These test methods are based on flow of a specified massof powder.I
13、f flow of a specific volume of powder is preferred,Test Method B855 may be used for powders that flow readilythrough the Hall Flowmeter funnel.5.6 This test method may be part of the purchase agreementbetween powder manufacturers and powder metallurgy(PM)1This test method is under the jurisdiction o
14、f ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of B09.02 onBase Metal Powders.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 1946.Last previous edition approved in 2013 as B213 13.DOI:10.1520/B0213-17.2For referenced
15、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.*A Summary of Changes section appears at the end of this standardCopyright ASTM In
16、ternational,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 part producers,or it can be an internal quality control test byeither the producer or the end
