What are rare earth magnets and types of rare earth magnets

Many people are not very clear about rare earth magnets, so today, the courageous magnet manufacturer Xiaofu shares with you what rare earth magnets are. The classification and application of rare earth magnets.


What is a rare earth magnet?

As the name implies, rare earth magnets are a kind of magnet, including rare earth metals. There are 17 rare earth metal family members, including La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc. Rare earth metals Pr, Nd, and Dy are used as raw materials for NdFeB, while Sm is used as raw material for cobalt.


Rare earth metals are costly because it is a rare resource. The mining process can also cause environmental damage. Therefore, countries like the USA, Russia, and Australia stopped mining and bought cheaper rare earth materials or products from China. The fluctuation in the price of rare earth metals is an essential factor in the increase in the price of rare earth magnets.


The chemistry of rare earth magnets is based on the intermetallic compound Nd2Fe14B. Magnets have a high magnetic energy product and coercivity. At the same time, the advantage of high energy density makes rare earth permanent magnets widely used in modern industry and electronics, thus making it possible to miniaturize, lighten, and thin equipment.


The principal rare earth magnets are NdFeB and SmCo.

1.NdFeB magnets

NdFeB sintered magnets are the most potent and cost-effective magnets in the world. They are widely used in many fields of technology, industrial production, and household products, such as electric motors, computers, electric cars, magnetic drive bearings, instrumentation, hi-fi speakers, NMR imaging, aerospace navigators, and maglev trains, etc. We can see neodymium magnets playing a massive role in new technologies. Cheap Pr-Nd metal replaces pure Nd to improve its oxidation resistance and mechanical properties. Dy is an additive used in high-grade Nd-Fe-B magnets. Adding only 2-3% of Dy can increase the coercivity of magnets. As the demand for magnets increases for high-end products, the demand for Dy also increases.


  1. Samarium Cobalt Magnets

Samarium Cobalt is the earliest rare earth magnet in the industry, including SmCo5 and Sm2Co17. Currently, Sm2Co17 is the preferred material for relatively more applications. The purity of oxide used in samarium cobalt magnets is not very high. For cost consideration, 95% oxide sa products are sufficient.


The main applications of rare earth magnets.

The applications of rare earth magnets, as we mentioned above, they are widely used in micro motors, permanent magnet instruments, the automotive industry, the electronics industry, intelligent homes, nuclear magnetic resonance devices, audio devices, sensors, magnetic levitation systems, magnetic transmission mechanisms, and magnetic therapy devices. It is widely used in computers, magnetic machinery, automatic control, microwave communication, aerospace, medical equipment, and other fields. Use.


If you need custom magnets or want to know, our custom magnet process can be understood through our custom magnet page, or you can contact us directly by message or email.


Reprinted from Haoxiang Magnets - “What are rare earth magnets and types of rare earth magnets

Publicado en Technology en octubre 13 at 03:53
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