What should we be aware of when measuring neodymium magnet powder?

Aneodymium magnet, also known as NdFeB, NIB, or Neo magnet, is a rare-earth magnet widely used in motor, sensor, computer, and microwave component manufacturing. When measuring the neodymium magnet powder, it has to be taken into account that the sample is magnetic, and the particles are very easy to agglomerate. Neodymium magnet powder should therefore be measured using the dry method, which overcomes the agglomeration phenomenon caused by magnetism through instantaneous dispersion of the agglomerates in the presence of a high-speed airflow. The degree of de-agglomeration is dependent on the air pressure used. Some materials might only need 2bar pressure, whilst others require higher pressure for full dispersion. Thus, the dispersed neodymium magnet sample can be measured accurately.

Since neodymium magnet powder is flammable when exposed to air, some precautions can be taken during the measurement:

• Inert gas or nitrogen gas should be used as the medium.
• To prevent the neodymium magnet particles from attaching to the inner wall of the tubes, smooth polyethylene tubes need to be applied.
• A water filtration vacuum cleaner is necessary for collecting measured particles.

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