If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
    ASTM B859 - 21

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

    Active Standard ASTM B859 | Developed by Subcommittee: B09.03

    Book of Standards Volume: 02.05

      Format Pages Price  
    PDF 6 $54.00   ADD TO CART
    Hardcopy (shipping and handling) 6 $54.00   ADD TO CART
    Standard + Redline PDF Bundle 12 $64.00   ADD TO CART

    Significance and Use

    4.1 Refractory metal powders, such as tungsten and molybdenum, are usually produced by hydrogen reduction at high temperatures. Thus, they usually contain numerous large, strongly-sintered agglomerates. Many of the manufacturing processes using these powders involve a milling step or some similar treatment or depend on the individual particulate size, not on the agglomerate size.3 Thus, a knowledge of the individual particulate size distribution, not the agglomerate size distribution, is usually desired from a particle size analysis of these powders. This practice provides a procedure for breaking down agglomerates into their constituent particles (de-agglomeration), without excessive fracture of the individual particles. The procedure is often referred to as laboratory milling or rod milling.

    4.2 The laboratory milling conditions specified in this guide have been in use since 1965, initially as part of a particle size analysis test method. This guide was first published as a separate, stand-alone standard in 1995 because of its applicability in preparing powder samples for analysis by other methods as well (for example, Test Methods B761 and B822). Information on the development and establishment of the milling conditions here specified can be found in the footnoted reference.4

    4.3 The milling procedure described in this practice does not necessarily break down only agglomerates without fracturing individual particles; some particle fracture may occur in certain powders. However, use of this practice does provide consistent particle size analysis results that have been found to relate well to powder behavior in numerous manufacturing processes.

    4.4 This practice shall be used for the de-agglomeration of the refractory metal powders and compounds listed in 1.2, when an evaluation of the individual particulate size distribution is required from the subsequent particle size analysis. It shall not be used when the agglomerate (as-is or as-supplied) size distribution is desired.

    4.5 This practice may be used in preparing samples for Test Methods B330, B761, B822, and other particle size analysis methods, prior to the dispersion procedure of Guide B821, if used.

    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 Units—With the exception of the values for mass, for which the use of the gram (g) unit is the long-standing industry practice, the values stated in SI units are to be regarded as standard. No other units of measure are included in this standard.

    1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Note 2.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    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 Methods for Estimating Average Particle Size of Metal Powders and Related Compounds Using Air Permeability

    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

    ICS Code

    ICS Number Code 77.160 (Powder metallurgy)

    UNSPSC Code

    UNSPSC Code

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/B0859-21

    Citation Format

    ASTM B859-21, Standard Practice for De-Agglomeration of Refractory Metal Powders and Their Compounds Prior to Particle Size Analysis, ASTM International, West Conshohocken, PA, 2021, www.astm.org

    Back to Top