Regarding rare earth magnets, many people are not very clear, so today the courage magnet manufacturer Xiamen everbeen will share with you what is a rare earth magnet? Classification and application of rare earth magnets.

What is a rare earth magnet?

As the name implies, a rare earth magnet is a type of magnet that includes rare earth metals. The rare earth metal family has 17 members, including La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc. The rare earth metals Pr, Nd, Dy are used as raw materials for neodymium iron boron, and Sm is used as raw materials for sa cobalt.

Rare earth metals are very expensive because they are rare resources. It also causes environmental damage during mining. Therefore, some countries such as the United States, Russia and Australia stopped mining and purchased cheap rare earth materials or products from China. The fluctuation of the price of rare earth metals is an important factor in the price increase of rare earth magnets.

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

The rare earth magnets are mainly neodymium iron boron and samarium cobalt.

1. Neodymium iron boron magnet

NdFeB sintered magnets are the most powerful and cost-effective magnets in the world. It is widely used in computers, electric motors, wind turbines, electric vehicles, instrumentation, magnetic drive bearings, high-fidelity speakers, nuclear magnetic resonance (NMR) imaging and aerospace navigators. It also played an important role in new technologies such as maglev trains. Cheap Pr-Nd metal replaces pure Nd to improve its oxidation resistance and mechanical properties. Dy is an additive for high-grade neodymium iron boron magnets. The coercivity of the magnet can be improved by only increasing Dy by 2-3%. As the demand for magnets for high-end products increases, so does the demand for Dy.

2. Samarium Cobalt Magnet

Samarium cobalt is the industry's earliest rare earth magnet, including SmCo5 and Sm2Co17. But Sm2Co17 is currently the material of choice. The purity of oxide oxide used in samarium cobalt magnets is not very high. In terms of cost, 95% oxidized sa product is sufficient.

The main applications of rare earth magnets;

Rare earths are mainly used in micromotors, permanent magnet instruments, electronics industry, automobile industry, smart home, nuclear magnetic resonance equipment, sensors, audio equipment, magnetic levitation systems, magnetic transmission mechanisms and magnetic therapy equipment, etc. It is widely used in computer, magnetic machinery, automatic control, microwave communication, aerospace, medical equipment and other fields. use.