Strong magnet refers to NdFeB Magnet. Compared with ferrite magnet, aluminum nickel cobalt, samarium cobalt magnetism is much more than other kinds of magnets, ndfeb magnet can absorb its own weight is 640 times the weight, so neodymium iron boron is often called by people outside the industry a strong magnet.
Strong magnet can be magnetized and demagnetization, because the magnet itself is or more will take some magnetic, so we can according to the use of strong magnet to develop a certain method of demagnetization method.
1. High temperature demagnetization:
High temperature demagnetization method of main is put into operation in the high temperature furnace for heating, after high temperature treatment will be powerful magnet magnetic eliminate, but in the process of heating for the effect of high temperature will directly result in magnets inside the change of the structure of the object changes, so the demagnetization method generally used for magnet for scrap and recycling.
2. Vibration demagnetization method:
The operation of this method is very simple is to carry out a strong and violent vibration on a strong magnet. After the operation of vibration, the internal structure of the magnet is changed, so as to change the physical properties of the magnet. In this way, generally speaking, the use of this demagnetization method is not effective, only a small amount of demagnetization can be used temporarily.
3. Ac magnetic demagnetization method:
This method of demagnetization is to put the magnet into a space that can produce an ALTERNATING magnetic field. After the interference of the alternating magnetic field, the internal structure of the magnet will be disturbed, so as to achieve the effect of demagnetization. This method is a relatively common method of demagnetization.
The above three methods are effective for the demagnetization of strong magnets. However, in ordinary times, we still prefer the alternating current demagnetization method to the high temperature demagnetization method and vibration demagnetization method with better effect and high efficiency, which is the most used method in industrial production at present.
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