ASTM_B_964_-_16.pdf

Designation:B96416Standard Test Methods forFlow Rate of Metal Powders Using the Carney Funnel1This standard is issued under the fixed designation B964;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 These test methods cover the determination of a flowrate,by use of the Carney funnel,of metal powders and powdermixtures that do not readily flow through the Hall funnel ofTest Method B213.1.2 This is a non-destructive quantitative test performed inthe laboratory.1.3 With the exception of the values for density and themass used to determine density,for which the use of gram percubic centimetre(g/cm3)and gram(g)units is the longstandingindustry practice,the values in inch-pound units are to beregarded as standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only,and are not considered standard.1.4 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.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 MetallurgyB855 Test Method for Volumetric Flow Rate of MetalPowders Using the Arnold Meter and Hall FlowmeterFunnel3.Terminology3.1 Definitions of powder metallurgy(PM)terms can befound in Terminology B243.3.2 Definitions of Terms Specific to This Standard:3.2.1 Carney flow rate(FRC),nthe time required for ametal powder sample of specified mass to flow through theorifice in a Carney funnel according to a specified procedure.3.3 3 Additional descriptive information is available in theRelated Materials section of Vol 02.05 of the Annual Book ofASTM Standards.4.Summary of Test Methods4.1 A weighed mass of metal powder is timed as it flowsthrough the orifice of a Carney funnel.5.Significance and Use5.1 The rate and uniformity of die cavity filling are relatedto flow properties,which thus influence production rates anduniformity of compacted parts.5.2 The ability of a powder to flow is a function ofinterparticle friction.As interparticle friction increases,flow isslowed.Some powders,often fine powders and lubricatedpowder mixtures,may not flow through the Hall funnel of TestMethod B213.Nevertheless,if a larger orifice is provided,such as in the Carney funnel,a meaningful flow rate may bedetermined,providing specific information for certain applica-tions.5.3 Test Method B213.,using the Hall funnel,is thepreferred method for determining the flowability of metalpowders.The Carney funnel of these test methods should onlybe used when a powder will not flow through the Hall funnel.These test methods may also be used for comparison of severalpowders when some flow through the Hall funnel and some donot.5.4 Humidity and moisture content influence flow rate.Wetor moist powders may not flow through either the Hall or theCarney funnel.5.5 These test methods are based on flow of a specific massof powder.If flow of a specific volume of powder is preferred,Test Method B855 may be used for powders that flow readilythrough the Hall funnel.5.6 These test methods may be part of the purchase agree-ment between powder suppliers and powder metallurgy(PM)part producers,or it can be an internal quality control test byeither the supplier or the end user.1These test methods are under the jurisdiction of ASTM Committee B09 onMetal Powders and Metal Powder Products and are the direct responsibility ofSubcommittee B09.02 on Base Metal Powders.Current edition approved June 1,2016.Published June 2016.Originallyapproved in 2009.Last previous edition approved in 2009 as B964-09.DOI:10.1520/B0964-16.2For 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.*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 States1 6.Apparatus6.1 Carney Powder Flowmeter Funnel3A flowmeter fun-nel(Fig.1)having an orifice of 0.200 6 0.005 in.(5.08 60.13 mm)in diameter.6.2 Stand3A stand(Fig.1)to support the powder flow-meter funnel.6.3 BaseA level,vibration-free base to support the pow-der flowmeter stand.6.4 Timing DeviceA stopwatch or other suitable timingdevice capable of measuring to the nearest 0.1 s.6.5 BalanceHaving a capacity of at least 250 g and asensitivity of 0.01 g.6.6 Weighing DishAn ordinary laboratory weigh