ASTM B964-23 PDF

Overview

ASTM B964-23: Standard Test Methods for Flow Rate of Metal Powders Using the Carney Funnel details laboratory procedures for determining the flow rate of metal powders and powder mixtures that do not flow readily through the Hall funnel, as referenced in ASTM B213. This standard provides a non-destructive, quantitative method, offering an important alternative for powders with high interparticle friction, fine powders, and lubricated powder mixtures. Accurate assessment of powder flow characteristics is crucial in powder metallurgy, impacting die cavity filling, production rates, and uniformity of compacted parts.

Key Topics

• Powder Flow Measurement: ASTM B964-23 describes using the Carney funnel, which has a larger orifice than the Hall funnel, to measure the flow rate of powders that exhibit poor flowability through narrower apertures.
• Applicability: The test is suitable only when powders will not flow through the Hall funnel. It serves as an effective comparative method for different powders within the same process or batch.
• Influencing Factors: Flow rate is mainly determined by interparticle friction. Conditions such as humidity and moisture content can significantly impede powder flow, underscoring the importance of controlled laboratory environments.
• Calibration and Reporting: Routine calibration using a certified 316L stainless steel reference powder ensures accuracy and repeatability. The standard outlines procedures for reporting corrected flow rate, ensuring results are consistent and comparable.

Applications

ASTM B964-23 is widely utilized in the powder metallurgy industry and by quality control laboratories. Key applications include:

• Quality Control: Powder manufacturers and end-users rely on this standard to verify consistency in powder flow characteristics, critical for high-quality part production.
• Supplier and Buyer Agreements: Test results may be incorporated into purchase agreements, serving as an objective basis for material acceptance or rejection.
• Research and Development: Laboratories use these test methods to develop new powder formulations and investigate the effects of additives or processing changes.
• Material Comparison: Ideal for side-by-side evaluation of multiple powders-especially when some powders are not amenable to Hall funnel testing but can be tested via the Carney funnel.

Related Standards

To ensure comprehensive analysis and comparability, several ASTM standards are referenced alongside ASTM B964-23:

• ASTM B213: Standard Test Methods for Flow Rate of Metal Powders Using the Hall Flowmeter Funnel - preferred for powders that flow through the Hall funnel.
• ASTM B215: Practices for Sampling Metal Powders - provides guidelines for representative sampling, critical for meaningful test results.
• ASTM B243: Terminology of Powder Metallurgy - standardizes vocabulary used in the field.
• ASTM B855: Test Method for Volumetric Flow Rate of Metal Powders Using the Arnold Meter and Hall Flowmeter Funnel – applicable for specific-volume flow rate measurement in free-flowing powders.

Practical Value

Adhering to ASTM B964-23 ensures:

• Reliable assessment of challenging powders: Enables accurate evaluation where traditional Hall funnel methods are inadequate.
• Improved process control: Supports manufacturers in monitoring and adjusting processes to maintain product quality.
• Standardization across the industry: Facilitates clear communication between suppliers and buyers, reducing ambiguities in material specifications.
• International recognition: Developed in accordance with WTO principles, promoting global trade and acceptance.

By implementing ASTM B964-23, organizations can maintain high standards of material quality, facilitate consistent part production, and ensure regulatory compliance within the powder metallurgy industry.