How can magnetic material powder that has formed agglomerates be completely dispersed?
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It is a crucial step to ensure accurate particle size measurement results.
The demand for magnetic materials and magnet products continues to grow each year globally. However, due to overcapacity in the ferrite and rare earth sectors, only high-quality products have a chance to succeed in the market. Controlling and detecting the particle size distribution is one of the key factors in ensuring product quality. For manufacturers and users alike, it's essential to use the right particle size detection method to obtain accurate data on the actual particle size and distribution of magnetic material powders.
What method should be used to measure the particle size of these magnetic materials? With the rapid development of laser technology, optoelectronics, and computer science in the 1970s, the laser particle size analyzer emerged as a powerful tool.
Laser particle size analyzers are widely used today because they offer a broad testing range, ease of operation, fast non-contact measurement, and good repeatability.
Laser diffraction is considered the most suitable method for measuring particle size and distribution. However, due to the unique properties of magnetic materials, special dispersion methods must be used. Can these materials be directly dispersed without demagnetization? Is dry dispersion more reliable than wet dispersion in terms of accuracy?
To answer these questions, our company conducted extensive experiments to determine the best testing approach.
The first method we tested was traditional wet dispersion. In wet dispersion, many factors influence the effectiveness of the process. Most commonly, ultrasonic treatment or dispersants are used to help break up agglomerates. However, different dispersants have varying degrees of success, and it's nearly impossible to fully separate all particles. Agglomeration remains a significant issue in this method.
Based on the experimental results, it became clear that wet dispersion struggles to effectively disperse magnetic materials. Moreover, there is no universal solvent or dispersant available for materials like zirconia or hard ferrite. This limitation makes dry dispersion a more viable option for particle size analysis of magnetic materials.
By using dry dispersion, we can avoid the challenges associated with wet methods and achieve better accuracy in particle size measurements. This approach not only simplifies the process but also improves the reliability of the results, making it an ideal choice for modern magnetic material testing.
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