ASTM B859-03

Standard Practice for De-Agglomeration of Refractory Metal Powders and Their Compounds Prior to Particle Size Analysis

SCOPE
1.1 This practice covers the de-agglomeration of refractory metal powders and their compounds in preparation for particle size analysis.
1.2 Experience has shown that this practice is satisfactory for the de-agglomeration of elemental tungsten, molybdenum, rhenium, and tantalum metal powders, and tungsten carbide. Other metal powders (for example, elemental metals, carbides, and nitrides) may be prepared for particle size analysis using this practice with caution as to effectiveness until actual satisfactory experience is developed.
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. For specific precautionary statements, see Note 2.

General Information

• Status: Historical
• Publication Date: 30-Sep-2003
• Technical Committee: B09 - Metal Powders and Metal Powder Products
• Drafting Committee: B09.03 - Refractory Metal Powders

Relations

• Replaces: ASTM B859-95(2000) - Standard Practice for De-Agglomeration of Refractory Metal Powders and Their Compounds Prior to Particle Size Analysis
• Effective Date: 01-Oct-2003
• Replaced By: ASTM B859-03(2008)e1 - Standard Practice for De-Agglomeration of Refractory Metal Powders and Their Compounds Prior to Particle Size Analysis
• Effective Date: 01-Jun-2008
• Referred By: ASTM B761-17(2021) - Standard Test Method for Particle Size Distribution of Metal Powders and Related Compounds by X-Ray Monitoring of Gravity Sedimentation
• Effective Date: 01-Oct-2003
• Referred By: ASTM B330-20 - Standard Test Methods for Estimating Average Particle Size of Metal Powders and Related Compounds Using Air Permeability
• Effective Date: 01-Oct-2003
• Referred By: ASTM E2651-19 - Standard Guide for Powder Particle Size Analysis
• Effective Date: 01-Oct-2003
• Referred By: ASTM E2980-20 - Standard Test Methods for Estimating Average Particle Size of Powders Using Air Permeability
• Effective Date: 01-Oct-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:B859–03
Standard Practice for
De-Agglomeration of Refractory Metal Powders and Their
1
Compounds Prior to Particle Size Analysis
This standard is issued under the fixed designation B 859; 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* ADJB0859 Detailed Drawings of Alternative Steel Milling
3
Bottles
1.1 This practice covers the de-agglomeration of refractory
metal powders and their compounds in preparation for particle
3. Terminology
size analysis.
3.1 Definitions—Definitions of powder metallurgy terms
1.2 Experience has shown that this practice is satisfactory
can be found in Terminology B 243.
for the de-agglomeration of elemental tungsten, molybdenum,
rhenium, and tantalum metal powders, and tungsten carbide.
4. Significance and Use
Other metal powders (for example, elemental metals, carbides,
4.1 Refractory metal powders, such as tungsten and molyb-
and nitrides) may be prepared for particle size analysis using
denum, are usually produced by hydrogen reduction at high
this practice with caution as to effectiveness until actual
temperatures. Thus, they usually contain numerous large,
satisfactory experience is developed.
strongly-sintered agglomerates. Many of the manufacturing
1.3 This standard does not purport to address all of the
processes using these powders involve a milling step or some
safety concerns, if any, associated with its use. It is the
similar treatment or depend on the individual particulate size,
responsibility of the user of this standard to establish appro-
4
not on the agglomerate size. Thus, a knowledge of the
priate safety and health practices and determine the applica-
individual particulate size distribution, not the agglomerate
bility of regulatory limitations prior to use. For specific
size distribution, is usually desired from a particle size analysis
precautionary statements, see Note 2.
of these powders. This practice provides a procedure for
2. Referenced Documents breaking down agglomerates into their constituent particles
(de-agglomeration), without excessive fracture of the indi-
2.1 ASTM Standards:
2 vidual particles. The procedure is often referred to as labora-
B 243 Terminology of Powder Metallurgy
tory milling or rod milling.
B 330 Test Method for Fisher Number of Metal Powders
2 4.2 The laboratory milling conditions specified in this guide
and Related Compounds
have been in use since 1965 as part ofTest Method B 430.This
B 430 Test Method for Particle Size Distribution of Refrac-
guide was first published as a separate, stand-alone standard in
tory Metal Powders and Related Compounds byTurbidim-
2 1995 because of its applicability in preparing powder samples
etry
for analysis by other methods (for example, Test Methods
B 761 Test Method for Particle Size Distribution of Metal
B 761 and B 822), in addition to Test Method B 430. Informa-
Powders and Related Compounds by X-Ray Monitoring of
2
tion on the development and establishment of the milling
Gravity Sedimentation
conditions here specified can be found in the footnoted
B 821 Guide for Liquid Dispersion of Metal Powders and
5
2
reference.
Related Compounds for Particle Size Analysis
4.3 The milling procedure described in this practice does
B 822 Test Method for Particle Size Distribution of Metal
2 not necessarily break down only agglomerates without fractur-
Powders and Related Compounds by Light Scattering
ing individual particles; some particle fracture may occur in
2.2 ASTM Adjunct:
certain powders. However, use of this practice does provide
3
Available from ASTM International Headquarters. Order Adjunct No.
ADJB0859.
1 4
This practice is under the jurisdiction of ASTM Committee B09 on Metal Michaels, A. I., “Turbidimetric Particle Size Distribution Theory: Application
Powders and Metal Powder Products and is the direct responsibility of Subcom- to Refractory Metal and Oxide Powders,” 1958 Symposium on Particle Size
mittee B09.03 on Refractory Metal Powders. Measurement, ASTM STP 234, ASTM, 1959, pp. 207–244.
5
Current edition approved Oct. 1, 2003. Published October 2003. Originally Buerkel, W. A., “Turbidimetric Particle Size Analysis as Applied to Tungsten
approved in 1995. Last previous edition approved in 2000 as B 859 – 95 (2000). Powder and the Carbide Industry,” Handbook of Metal Powders, A. Poster, ed.,
2
Annual Book of ASTM Standards, Vol 02.05. Reinhold Publishing Corp., New York, NY, 1966, pp. 20–37.
*A Summary of Changes section appears at the end of this standard.
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