NdFeB strong magnets are one of the most common and strongest magnets at present. They have excellent performance and strong magnetic force, but sometimes they need to be demagnetized for reuse or waste treatment. So how to make the demagnetization effect of NdFeB strong magnets the best?
First of all, everyone needs to know what demagnetization is. Demagnetization is to reduce the magnetic energy in the magnet by a specific method, so that the magnetic field in it gradually weakens and eventually disappears. NdFeB strong magnets generally lose their magnetic force due to repeated use, long-term storage, high temperature, high humidity and other factors. At this time, demagnetization is required.
Secondly, we need to understand the demagnetization method. Common demagnetization methods include thermal demagnetization, vibration demagnetization, and current demagnetization. Among them, thermal demagnetization is to reduce the magnetic energy by heating the magnet, so that the magnetic field gradually weakens, thereby achieving the effect of demagnetization; vibration demagnetization is to put the magnet into a vibration machine for vibration, so that the magnetic particles vibrate with each other, so that the magnetic field gradually disappears; current demagnetization is to gradually eliminate the magnetic field in the magnet through an external current field.
Finally, we need to know how to perform the demagnetization operation. When demagnetizing, the appropriate demagnetization method should be selected according to the specific situation, and the following points should be noted:
1. The demagnetization process should be carried out slowly, not too fast, otherwise it will damage the magnet.
2. The demagnetization process should be carried out evenly, and only a part of the magnet should not be treated, otherwise it will cause local magnetic field residue in the magnet.
3. During the demagnetization process, the temperature and humidity of the magnet should be controlled to avoid other effects on the magnet.
