GB/T 37561-2019 in English

The importance of dispersion treatment before particle size determination of refractory metal and its compound powders

Refractory metals, such as tungsten, molybdenum, tantalum and their compounds (such as tungsten carbide), have important applications in modern industry, especially in the fields of high temperature and wear resistance. However, these powders are usually in a state of agglomeration and need to be dispersed before being used directly for particle size analysis to obtain accurate results.

Background of standard formulation and technological evolution

This standard GB/T 37561-2019 was issued in 2019 and replaced the old dispersion treatment method. Its formulation is based on the following requirements:

• Solve the agglomeration problem: Refractory metal powders are prone to agglomeration, which affects the accuracy of particle size analysis.
• Improve measurement accuracy: Ensure the reliability of particle size distribution data through standardized dispersion treatment.
• Unified industry standards: Establish unified technical specifications for domestic related enterprises.

Detailed interpretation of dispersion treatment methods

This standard specifies the specific steps for the dispersion treatment of refractory metal powders, including:

1. Equipment selection: Use grinding bottle and tungsten rod for grinding.
2. Operation process: Place the powder in the grinding bottle, add an appropriate amount of grinding rod, and grind on the grinder at a speed of 145 r/min for 60 minutes ± 0.25 minutes.
3. Sieving treatment: After grinding, use an 850μm (20 mesh) sieve to separate the grinding rod and collect the powder.

Comparative analysis of standard frameworks

Implementation suggestions and precautions