NdFeB strong magnet high temperature resistance degaussing reasons and solutions

Regarding the phenomenon of high-temperature demagnetization of NdFeB magnets, many customers use NdFeB strong magnets in high-temperature environments to process and work, resulting in the magnetic force of the magnet decreasing, or completely disappearing, the main reason is that the coercivity of the magnet is not enough, and the material does not choose the material with the same temperature of the magnet.

The reason for magnetism is that most of the electrons in the magnet rotate in the same direction around the atoms, so that each electron produces a magnetic field, which is the magnetic field generated by the magnet from a macroscopic point of view. (This is like a macroscopic representation of the Ampere's Loren magnetism.) Now because the temperature rises, the irregular motion of the molecules is accelerated, so that as the temperature rises, the regular form of motion inside is destroyed, so the magnetism weakens or disappears

In general, you have not chosen the corresponding grade of NdFeB raw materials, NdFeB is more sensitive to temperature, improve the coercivity of the NdFeB used, or put forward specific temperature requirements (to have a specific plan and use environment) to use a suitable magnet.

If the magnet in the motor is demagnetized, it is a problem with the design of the magnetic circuit, and the magnet is demagnetized due to the generation of a demagnetizing field, of course, the premise is that the magnet of the grade is used.

NdFeB degaussing is generally a matter of operating temperature. If it works above its maximum operating temperature for a long time, it will be demagnetized immediately. How do you use it, and what grade of NdFeB do you use?

Hello dear, I have helped you find the result: NDFEB magnets can maintain their magnetic properties in an environment between 300 degrees and 350 degrees. At the same time, at room temperature, the magnetic energy of the NdFeB magnet can reach above, with high polarizability and great magnetizing force.

In addition, NDFEB magnet is also a product with high material stability, which can withstand acid, alkali, salt, humidity and other conditions in the general industrial environment, and can also withstand low temperature environments, and has stable magnetic energy and magnetic susceptibility.

1. High-temperature demagnetization method: disrupt the electron directional movement in the NdFeB magnet, put the magnetic NdFeB magnet in a place with a high temperature of 250-300 degrees or in a magnetizer will slowly begin to demagnetize, and the magnetic force can be demagnetized after half an hour or half an hour.

2. NdFeB is divided into two types: sintered NdFeB and bonded NdFeB, which are magnetic and corrosion-resistant in all directions; The sintered NdFeB is easy to corrode, and the surface needs to be coated, generally including galvanized plating, nickel, environmental protection zinc, environmental protection nickel, nickel copper nickel, environmental protection nickel copper nickel, etc. The sintered NdFeB is generally divided into axial magnetization and radial magnetization, which is determined according to the required working surface.

There really seems to be no other way than high-temperature demagnetization.

Not really. Do you use a vacuum furnace?

Summary. The NdFeB magnet surface treatment affects the magnetic properties, but this effect is usually minimal.

The NdFeB magnet surface treatment affects the magnetic properties, but this effect is usually minimal.

I'm sorry I don't understand, but can you elaborate on that?

The surface treatment of NdFeB magnets will have an impact on their magnetic properties. Common surface treatment methods mainly include oxidation, spraying, aluminization, etc. Among them, oxidation treatment is the most common surface treatment, by forming an oxide film on the surface of the magnet, it can improve the corrosion resistance and oxidation resistance of the magnet, but at the same time, it will also weaken the surface magnetic field strength of the magnet.

Surface treatments such as spraying and aluminizing do not affect the surface magnetic field strength of the magnet, but the corrosion resistance and mechanical strength of the magnet can be further improved through the protection of the coating. Therefore, it is necessary to consider various factors and choose the appropriate surface treatment method to meet the application requirements of magnets to the greatest extent.

1.If you use NdFeB at room temperature, it is an absolute magneto, but it has a lot of properties. It can withstand temperatures up to about 250 degrees Celsius, but it will be very expensive.

Performance from N33-N35-N38-N40-N45-N48-N50 At present, the highest performance in China has exceeded N50Products of the same size from 33 to 50 can vary by dozens of times. Of course, it depends on the performance, shape, and some specific requirements you need!

If the operating temperature of the product is above 200 degrees, then it is best to use alnico or samarium cobalt magnets. There is still a gap in magnetic properties compared with NdFeB. But the other two materials are also more expensive, especially samarium cobalt.

2 No one has calculated this specifically, but you can try it yourself with a smaller one. It can be calculated, but it may need to be a small area. 30-50cm I feel enough, after all, it can reach 100kg of repulsion, and the volume of the magnet itself is not small.

And there is currently no material that can obviously play a role in magnetic insulation, if you find that you will be big! I've had a lot of customers who had similar problems, but eventually changed their products.

3.I said it above because I'm a magnet myself. It is also very troublesome for us to ship to customers, because the magnetic material cannot be transported by air, and if there is something that can be magnetically isolated, it can be on the plane, but there is no such material.

The penetration of magnetic field lines is too strong, and there is basically no way to completely shield them. A small amount is still possible, we send a magnet the size of a mobile phone, and finally the package is as big as a suitcase, so that we can go out. There are also many times when they are detained by airport security.

1.Be careful not to get your hands pinched.

2.Surface treatment, electroplating, phosphating, etc. are to be carried out.

3.Prevent working beyond its operating temperature, which is different for each grade.

4.NdFeB material is brittle and brittle, so pay attention to the use process.

1: The magnetic force is large, pay attention to the protection of the hand and body, watches, mobile phones, electronic instruments, will affect 2: The magnetic force is small, and it has no effect.

Generally, the finished NdFeB has coating protection, pay attention to the surface plating should not fall, it is easy to prepare for oxidation, and it is not easy to preserve.

1. Whether some properties meet the requirements, coercivity, magnetic energy product, etc.;

2. Use environment: temperature, whether it is a corrosive environment;

3. Pay attention to safety when using, and it is best to demagnetize when not in use for a long time.

NdFeB is brittle due to its strong magnetic force, so you need to be careful when using it, and it must not collide strongly.