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Solutions for High Temperature Demagnetization of Bonded NdFeB Magnet

Bonded NdFeB magnet can be maintained for a long time at room temperature, but it is well known that they will demagnetize when exposed to high temperatures. The combination of cost and performance of bonded NdFeB magnet makes it a popular choice for using traditional magnets and creating new products. In the case of a sharp increase in magnetic force, a smaller magnet can be used, which is beneficial to most designs.


Ⅰ. Treatment of bonded NdFeB magnet at high temperature

Handling procedures need to be careful, because bonded neodymium iron boron magnets are easy to demagnetize at high temperatures. Due to the high content of neodymium iron in bonded neodymium iron boron magnets, they are also easy to oxidize, so the various coatings that meet these conditions depend on the operating environment of the bonded neodymium iron boron magnets.

The reason why NdFeB demagnetizes in a high temperature environment is determined by its physical structure. Generally, a magnet can generate a magnetic field because the electrons carried by the substance itself rotate in a direction around the atom, thereby generating magnetic field force, which in turn has an impact on surrounding related things.

However, the electrons revolve around atoms in a predetermined direction are also subject to temperature conditions. The temperature that different magnetic materials can withstand is also different. When the temperature is too high, the electrons will deviate from the original orbit and cause chaos. At this time, the magnetic The local magnetic field of the material will be disrupted, and the NdFeB magnet will demagnetize.

The temperature resistance of the powerful NdFeB magnet is about 200℃, that is, demagnetization will occur if the temperature exceeds 200℃. If the temperature is higher, the demagnetization will be more serious.

Ⅱ. Solutions for high temperature demagnetization of bonded neodymium iron boron magnets

1. Don't put the NdFeB magnet product at too high temperature, especially pay attention to its critical temperature, which is 200℃. Adjust its working environment temperature in time to minimize the occurrence of demagnetization.

2. Starting from technology, improve the performance of products using bonded neodymium iron boron magnets, so that they can have a higher temperature structure and are not easily affected by the environment.

3. You can also choose high-coercivity materials with the same magnetic energy product. If it doesn't work, you can only sacrifice a little magnetic energy product and find a higher coercivity material with a lower magnetic energy product. If it doesn't work, you can choose to use samarium cobalt. For reversible demagnetization, only samarium cobalt is selected.