Firstly, what is high-temperature demagnetization?

High temperature demagnetization refers to demagnetizing a demagnetized product (neodymium iron boron magnet) in a high temperature environment. The principle is that in a high temperature environment, if the temperature is greater than the Curie temperature of the magnet and the thermal movement of the magnet molecules causes the magnetic moment to rearrange in a disorderly and disorderly manner, with different directions, and the overall external manifestation is demagnetization, which is the principle of high temperature demagnetization.

What are the methods or equipment for high-temperature demagnetization of neodymium iron boron?

Heating magnet

The neodymium iron boron series magnets can be demagnetized using hot oil, with an oil temperature usually reaching 80-200 degrees Celsius, which can completely eliminate magnetism. The disadvantage of using this method is that the oil film generated on the surface of the product after hot bath is difficult to treat, and the appearance is not beautiful, which many customers may not necessarily accept!

In addition, heating can be carried out using ovens, high-temperature ovens, high-temperature flamethrowers, etc. to demagnetize neodymium iron boron magnets.

How long does high-temperature demagnetization of neodymium iron boron last?

The Curie temperature of neodymium iron boron magnets is around 310-350 degrees. Based on experience, magnets with general demagnetization performance can be completely demagnetized after lasting for one hour at 300 degrees. Large size magnets take longer and cannot reach the theoretical Curie temperature.