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What is high temperature demagnetization? Method and time of high temperature demagnetization of neodymium iron boron magnets


What is high temperature demagnetization? What is the principle of high temperature demagnetization? What equipment is needed to demagnetize the neodymium iron boron strong magnet at high temperature? How long does it take for a demagnetization? Today’s article will help you understand one by one.

    High temperature demagnetization is to demagnetize the 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, the thermal movement of the magnet molecules causes the magnetic moments to rearrange disorderly and in different directions. , The overall appearance is non-magnetic, which is the principle of high-temperature demagnetization.

    What are the methods or equipment for high temperature demagnetization of NdFeB?

    NdFeB high temperature demagnetization

    NdFeB series magnets can be demagnetized with hot oil. The oil temperature usually reaches 80-200 degrees Celsius, which can completely eliminate magnetism. The disadvantage of this method is that the oil film on the surface of the product is difficult to deal with after the product is heated, and the appearance is not Good-looking, many customers may not accept it!

    In addition, the NdFeB magnet can be demagnetized by heating with an oven, high-temperature furnace, high-temperature torch, etc.

    How long does it take to demagnetize NdFeB at high temperature?

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

    The temperature resistance of NdFeB tested by some netizens is 100 degrees. When heated to about 100 degrees, the magnetic force begins to decrease, and after 150 degrees, the magnetic force is basically fading after 20 minutes. After demagnetization, iron-boron can only reach about 50% of its original value, and the surface appears blackened and oxidized.

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