ASTM B330-05
(Test Method)Standard Test Method for Fisher Number of Metal Powders and Related Compounds
Standard Test Method for Fisher Number of Metal Powders and Related Compounds
SCOPE
1.1 This test method uses air permeability to determine an envelope-specific surface area and its associated average equivalent spherical diameter (from 1 to 50 m) of metal powders and related compounds. The powders may be analyzed in their "as-supplied" (shipped, received, or processed) condition or after they have been de-agglomerated or milled by a laboratory procedure ("lab milled") such as that specified in Practice B 859. The values obtained are not intended to be absolute but are generally useful on a relative basis for control purposes.
1.2 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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Standards Content (Sample)
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Designation:B330–05
Standard Test Method for
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Fisher Number of Metal Powders and Related Compounds
This standard is issued under the fixed designation B 330; 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.
1. Scope 3. Terminology
1.1 This test method uses air permeability to determine an 3.1 Definitions—Many terms used in this test method are
envelope-specific surface area and its associated average defined in Terminology B 243.
equivalent spherical diameter (from 0.5 to 50 µm) of metal 3.2 Definitions of Terms Specific to This Standard:
powders and related compounds. The powders may be ana- 3.2.1 Fisher sub-sieve sizer, n—a commercially available
lyzed in their “as-supplied” (shipped, received, or processed) permeability instrument for measuring envelope-specific sur-
condition or after they have been de-agglomerated or milled by face area.
a laboratory procedure (“lab milled”) such as that specified in 3.2.2 envelope-specific surface area, n—specific surface
Practice B 859. The values obtained are not intended to be area of a powder as determined by gas permeametry in
absolute but are generally useful on a relative basis for control accordance with ISO/DIS 10070.
purposes. 3.2.3 air permeability, n—measurementofairpressuredrop
1.2 This standard does not purport to address all of the across a packed bed of powder.
safety concerns, if any, associated with its use. It is the 3.2.4 de-agglomeration, n—process used to break up ag-
responsibility of the user of this standard to establish appro- glomerates of particles.
priate safety and health practices and determine the applica- 3.2.5 Fisher Number, n—calculated value equated to an
bility of regulatory limitations prior to use. average particle diameter, assuming all the particles are spheri-
cal and of uniform size.
2. Referenced Documents
3.2.6 Fisher calibrator tube, n—jewel with a precision
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2.1 ASTM Standards:
orifice mounted in a tube similar to a sample tube. The
B 243 Terminology of Powder Metallurgy calibrator tube value is directly traceable to the master tube
B 859 Practice for De-Agglomeration of Refractory Metal
maintained by Fisher.
Powders and Their Compounds Prior to Particle Size
3.2.7 porosity of a bed of powder, n—ratio of the volume of
Analysis the void space in the powder bed to the that of the overall
E 456 Terminology Relating to Quality and Statistics
volume of the powder bed.
E 691 Practice for Conducting an Interlaboratory Study to 3.2.8 agglomerate, n—several particles adhering together.
Determine the Precision of a Test Method
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4. Significance and Use
2.2 ISO/DIS Document:
ISO/DIS 10070 Metallic Powders Determinations of 4.1 This test method provides a procedure for determining
Envelope-Specific Surface Area from Measurements of the envelope-specific surface area of powders, from which is
the Permeability to Air of a Powder Bed Under Steady- calculated an “average” particle diameter, assuming the par-
State Flow Conditions ticles are monosize, smooth surface, nonporous, spherical
particles. For this reason, values obtained by this test method
will be defined as a Fisher Number. The degree of correlation
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between the results of this test method and the quality of
This test method is under the jurisdiction of ASTM Committee B09 on Metal
Powders and Metal Powder Products and is the direst responsibility of Subcommit-
powders in use will vary with each particular application and
tee B09.03 on Refractory Metal Powders.
has not been fully determined.
Current edition approved Oct. 1, 2005. Published October 2005. Originally
4.2 This test method is generally applicable to all metal
approved in 1958. Last previous edition approved in 2002 as B 330 – 02.
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powders and related compounds, including carbides, nitrides,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and oxides, for particles having diameters between 0.5 and 50
Standards volume information, refer to the standard’s Document Summary page on
µm. It should not be used for powders composed of particles
the ASTM website.
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whose shape is too far from equiaxed, that is, flakes or fibers.
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036. Inthesecases,itispermissibletousethetestmethoddescribed
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B330–05
only by agreement between the parties concerned. This test 6.1.1
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