Powerful magnets are NdFeB magnets. Compared with ferrite magnets, AlNiCo, SmCo, its magnetic properties greatly surpass other kinds of magnets. NdFeB magnets can absorb 640 times its own weight, so NdFeB is often used by people outside the industry. Called a powerful magnet.
Powerful magnets can be magnetized and demagnetized, because the magnet itself is more or less magnetic, so we can formulate a certain method for demagnetization according to the use of power magnets.
1.High temperature demagnetization method:
The main operation of the high temperature demagnetization method is to put the magnet into a high temperature furnace for heating. After the high temperature treatment, the magnetism of the powerful magnet will be removed. However, during the heating process, the structure of the object inside the magnet will be directly caused by the high temperature. Significant changes have occurred, so this method of demagnetization is generally used for scrapped and recycled magnets.
2. Vibration demagnetization method:
The operation of this method is very simple. It is to perform strong and intense vibration on the powerful magnet. After the vibration operation, the internal structure of the magnet is changed, thereby changing the physical properties of the magnet. This method generally uses the effect of this demagnetization method. Not big, only a small amount of demagnetization can be used temporarily.
3. Magnet AC demagnetization method:
This demagnetization method is to put the magnet into a space that can generate an AC magnetic field. After the AC magnetic field is disturbed, the internal structure of the magnet will be disrupted, so that the demagnetization effect can be achieved. This method is more common. Demagnetization method.
The above three methods are effective for strong magnet demagnetization, but in general, we still prefer the AC demagnetization method, which has better effect than the high temperature demagnetization method and vibration demagnetization method. It is the most widely used method in industrial production.