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Professional magnetic term for NdFeb powerful magnets (Ndfeb)

In daily life, the terminology of magnetism has not been widely disseminated and understood for people in non-professional fields.

Rare earth neodymium iron boron magnet is a member of the rare earth magnet family and is the most powerful permanent magnet in the world. They are called neodymium iron boron magnets or because they are mainly composed of neodymium (Nd), iron (Fe) and boron (B). NdFeB magnets are a relatively new invention that has only become a popular product in everyday use until recently.

Neodymium iron boron magnet

The grades of NdFeB magnets are classified into N35, N38, N42, N38SH, etc. These grades are based on the NdFeB material grade. In general, the larger the number (the number after N), the stronger the magnet's magnetism. The highest grade neodymium iron boron magnet currently available is the N52. The letters that follow the level refer to the temperature level of the magnet. If there is no letter behind the grade, then the magnet is the standard temperature. The temperature rating is standard (no letter comment) - M - H - SH - UH - EH. The performance table and temperature resistance are shown in the table below.

Strong magnet


Magnet performance table


Magnet temperature coefficient


Gold plated magnet

The surface treatment of neodymium iron boron magnets is mainly electroplating or spraying.

NdFeB magnets are mainly composed of barium, iron and boron. If exposed to the natural environment, the iron in the magnet is extremely rusty. In order to protect the magnet from corrosion and enhance the protection of the brittle magnet material, the magnet is usually surface treated. There are many options for electroplating coatings. Nickel plating is the most common and preferred. Our nickel-plated magnets are actually made up of three layers, nickel, copper and nickel. This triple coating makes the magnet more durable. Other coating options include zinc, copper, epoxy, gold and silver. Gold plating is actually made up of a top four coat of nickel, copper, nickel and gold.


Because the NdFeB material is extremely brittle, the coating is easily peeled off and cracked, and the conventional processing method is not effective. Heat is generated during the processing of the magnet, and if not carefully controlled, the magnet will demagnetize due to high temperatures. It is not recommended to machine the magnet.

The problem of magnet demagnetization is also critical, but unlike most other types of magnets, NdFeB magnets have high resistance to demagnetization. They do not attenuate the magnetic force due to the disappearance of the surrounding external magnetic field. But they are sensitive to the reaction of the outside temperature, and if they are heated above their maximum operating temperature, their magnetic force will drop rapidly. If heated above the Curie temperature, they will completely lose their magnetism. Therefore, in the process of using the magnet, we must pay attention to the change of the working temperature, even if it is instantaneous.

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