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Application fields and basic knowledge of Nd-Fe-B magnets

Nov 25,2021 / News, Industry News / Author: ShengKui

Neodymium iron boron magnet is the highest commercialized magnet found so far. It is called magneto king. It has the characteristics of small volume, light weight and strong magnetism. It is the magnet with the best performance price ratio so far. It has extremely high magnetic properties, and its maximum magnetic energy product is more than 10 times higher than that of ferrite. Its machining performance is also quite good. The working temperature can reach up to 200 ℃. Moreover, it has hard texture, stable performance and good cost performance, so it is widely used. However, because of its strong chemical activity, its surface must be coated.

Basic knowledge of NdFeB magnet:

NdFeB magnets can be divided into bonded NdFeB magnets and sintered NdFeB magnets.

It is estimated that in the next 20-30 years, there will be no magnetic materials to replace NdFeB magnets. The main raw materials for the production of NdFeB magnets are neodymium, pure iron, ferroboron alloy and other additives.

The core technology of NdFeB magnet industry is mainly reflected in the manufacturing process, specifically in the uniformity, consistency, processing quality, coating quality and so on.

As the third generation rare earth permanent magnet material, NdFeB magnet has high performance price ratio. It is widely used in energy, transportation, machinery, medical treatment, it, household appliances and other industries. Especially with the development of knowledge economy represented by information technology, it continues to bring new uses to rare earth permanent magnet NdFeB industry and other functional materials, This brings a broader market prospect for Nd-Fe-B industry.

Application of NdFeB magnet in medical treatment:

Nd-Fe-B permanent magnet is a high-tech material in the National 863 project. What he can produce is a biological magnetic field that simulates the characteristics of human magnetic field, with stable performance! The magnetic field acting on the human body can correct the deviation of the human body's own magnetic field, and promote the operation of meridians and Qi by enhancing the bioelectromagnetic energy of the human meridians, so as to dredge the meridians, increase the blood and oxygen supply to the brain, reduce the excitability of the peripheral nerves of the cerebral cortex, and produce the effects of promoting the new metabolism of bone and joint tissue, hypnosis, analgesia, sedation, promoting blood circulation and eliminating anxiety. At present, it is commonly used to treat chronic bone and joint diseases such as insomnia, neurasthenia, cervical spondylosis and scapulohumeral periarthritis, as well as pain, numbness and other symptoms caused by these diseases.

The temperature resistance of Nd-Fe-B is about 2 Baidu, that is, if it exceeds 2 Baidu, demagnetization will occur. If the temperature is higher, demagnetization will be more serious.

1、 Do not put the NdFeB magnet product in too high temperature, especially pay attention to its critical temperature, i.e. two Baidu, and adjust its working environment temperature in time to minimize demagnetization.

2、 It is to improve the performance of products using magnets from the perspective of technology, so that they can have a more 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 not, you can only sacrifice a little magnetic energy product and find materials with higher coercivity with lower magnetic energy product. If not, you can choose to use samarium cobalt. As for reversible demagnetization, you can only choose samarium cobalt. Each material has different characteristics. So choose the most appropriate and economical one. When designing, we should consider it carefully, otherwise it will bring losses.

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