How can agglomerated magnetic material powder be completely dispersed?
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It is essential to ensure accurate particle size measurement results.
The demand for magnetic materials and magnet products continues to grow globally each year. However, due to overcapacity in the global ferrite and rare earth markets, only high-quality products can stand out in the competitive market. Controlling and detecting the particle size distribution of these products is one of the key factors that determine their quality. For manufacturers and users alike, it's crucial to use the right particle size detection method to obtain accurate and reliable data on the particle size and distribution of magnetic material powders.
What method is best suited for measuring the particle size of such 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. It offers a wide measurement range, ease of use, non-contact operation, and excellent repeatability, making it widely adopted in various industries.
Laser diffraction is considered one of the most suitable methods for determining particle size and distribution. However, due to the unique properties of magnetic materials, special dispersion techniques are required. Can the material be dispersed directly without demagnetization? Is dry dispersion more reliable than wet dispersion in terms of accuracy and consistency?
To address these questions, our company has conducted extensive experiments to identify the most effective testing method. The first approach we tested was traditional wet dispersion. In this process, many factors can influence the dispersion effect. Most commonly, ultrasonic treatment or dispersants are used to help break up the agglomerates. However, different dispersants yield varying results, and none can fully separate the particles into individual units. Agglomeration remains a significant issue.
From the experimental findings, it became clear that wet dispersion is not ideal for magnetic materials. Additionally, there is no universal solvent or dispersant available for all types of magnetic powders, including zirconia and hard ferrites. As a result, dry dispersion emerges as a viable and more practical alternative for particle size analysis of magnetic materials.
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