1. 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.
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
B243 Terminology of Powder Metallurgy
B330 Test Method for Fisher Number of Metal Powders and Related Compounds
B430 Test Method for Particle Size Distribution of Refractory Metal Powders and Related Compounds by Turbidimetry
B761 Test Method for Particle Size Distribution of Metal Powders and Related Compounds by X-Ray Monitoring of Gravity Sedimentation
B821 Guide for Liquid Dispersion of Metal Powders and Related Compounds for Particle Size Analysis
B822 Test Method for Particle Size Distribution of Metal Powders and Related Compounds by Light Scattering
Keywords
de-agglomeration; laboratory-milled; laboratory milling; molybdenum; particle size analysis; powders; refractory metals; rhenium; rod-milled; rod milling; tantalum; tungsten; tungsten carbide; De-agglomeration; Laboratory-milled powders; Molybdenum; Particle analysis--metallic materials; Powders; Refractory metal powders; Rhenium powder; Rod-milled powders; Tantalum (Ta) powder; Tungsten; Tungsten carbide
DOI: 10.1520/B0859-03
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