ASTM B855-94(1999)e1
(Test Method)Standard Test Method for Volumetric Flow Rate of Metal Powders Using Arnold Meter and Hall Funnel
Standard Test Method for Volumetric Flow Rate of Metal Powders Using Arnold Meter and Hall Funnel
SCOPE
1.1 This test method covers a procedure for measuring the flow characteristics of a given volume of powder.
1.2 The values stated in SI units are to be regarded as the standard (except for the Hall Flowmeter Funnel, which is produced in inch-pound units). The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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e1
Designation:B855–94 (Reapproved 1999)
Standard Test Method for
Volumetric Flow Rate of Metal Powders Using Arnold Meter
and Hall Funnel
This standard is issued under the fixed designation B 855; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE—An editorial change was made in Section 9.4 in November 1999.
1. Scope 5. Significance and Use
1.1 This test method covers a procedure for measuring the 5.1 The volumetric flow rate is a true measure of the flow
flow characteristics of a given volume of powder. characteristics of a metal powder. Measuring flow by volume
1.2 The values stated in SI units are to be regarded as the ascomparedtoflowperunitmasseliminatesthevariableofthe
standard (except for the Hall Flowmeter Funnel, which is powder density.
producedininch-poundunits).Thevaluesgiveninparentheses 5.2 The ability of a powder to flow and pack is a function of
are for information only. interparticle friction.As the surface area increases, the amount
1.3 This standard does not purport to address all of the of friction in a powder mass also increases. Consequently, the
safety concerns, if any, associated with its use. It is the friction between particles increases, giving less efficient flow
responsibility of the user of this standard to establish appro- and packing.
priate safety and health practices and determine the applica- 5.3 Knowledge of the volumetric flow rate is important to
bility of regulatory limitations prior to use. the parts’ producer in estimating production rates—compacts
per hour, as well as for blending and mixing of powders.
2. Referenced Documents
5.4 This test method may be part of the purchase agreement
2.1 ASTM Standards:
between powder manufacturers and powder metallurgy (P/M)
B 213 Test Method for Flow Rate of Metal Powders part producers, or it can be an internal quality control test by
B 215 Practices for Sampling Finished Lots of Metal Pow-
either the producer or the end user.
ders
6. Apparatus
B 243 Terminology of Powder Metallurgy
B 703 Test Method forApparent Density of Metal Powders 6.1 Arnold Density Meter —(Test Method B 703) a hard-
using the Arnold Meter ened tempered and demagnetized steel block having a center
hole 31.6640 6 0.0025 mm (1.24666 0.0001 in.) and a height
3. Terminology
of 25.4000 6 0.0025 mm (1.0000 6 0.0001 in.) that corre-
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3.1 Definitions—Useful definitions of terms for metal pow- sponds to a volume of 20 cm (1.22 in. ) (Fig. 1).
ders and powder metallurgy are found in Terminology B 243.
6.2 Bushing—either brass or bronze.Approximately 38 mm
3.2 Definitions of Terms Specific to This Standard: (1.50 in.) inside diameter (ID) by 45 mm (1.75 in.) outside
3.2.1 volumetric flow rate—the time required for a given
diameter (OD) by 38 mm (1.50 in.) long (Fig. 1).
volume of powder to flow through an orifice in a standard 6.3 Hall Flowmeter —(Test Method B 213) A standard
instrument according to a specified procedure.
flowmeter funnel having a calibrated orifice of 0.10 in. (2.54
mm) in diameter complete with stand (Fig. 2).
4. Summary of Test Method
6.4 Base—A level, vibration-free base to support the Hall
4.1 This test method consists of slowly sliding a bushing
Flowmeter.
partially filled with powder over a 20 cm hole in a hardened
6.5 Paper—Glazed or waxed paper measuring approxi-
steel block. The volume of the powder obtained upon removal
mately 150 mm by 150 mm square (6.0 in. by 6.0 in.).
of the steel block is transferred to a Hall Flowmeter and the
6.6 Timing Device—Stopwatch or other suitable device.
flow rate reported in seconds per 20 cm .
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This test method is under the jurisdiction of ASTM Committee B-9 on Metal TheArnoldDensityMetercompletewithbushingisavailablefromArnoldP/M
PowdersandMetalPowderProductandisthedirectresponsibilityofSubcommittee Consulting Services, 648 Cedar Road, St. Marys, PA 15857 and also from Alcan
B09.02 on Base Metal Powders. Powders & Pigments, 901 Lehigh Avenue, Union, NJ 07083-7632.
Current edition approved Aug. 15, 1994. Published October 1994. The complete Hall Flowmeter is available from Alcan Powders & Pigments,
Annual Book of ASTM Standards, Vol 02.05. 901 Lehigh Avenue, Union NJ 07083-7632.
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