There are many types of magnets. Generally divided into two categories of permanent magnet and soft magnetic. We refer

to the magnet, generally refers to the permanent magnet.

Permanent magnets are divided into two categories:

The first category: metal alloy magnet, including NdFeB magnet Samarium cobalt magnet, Alnico magnet

The second category: ferrite permanent magnet

1, NdFeB magnet: it is the strongest magnet magnet, known as the magnetic king, has a very high magnetic properties of its 

maximum energy product over 10 times higher than ferrite. NdFeB mechanical processing performance is very good. Operating

 temperature up to 200 degrees Celsius. But also to hard, stable performance, a very good price, it is widely used in various 

industries. But because of its strong chemical activity, it must be the surface coating. (Such as Zn, Ni, epoxy, etc.).

2. Ferrite magnets: the main raw materials include Ba0 or Sr0 and Fe203. Because the ferrite magnets have good temperature 

resistance, low cost, moderate performance, has become the most widely used permanent magnets. It is made of ceramic 

technology, hard texture, is a brittle material.

3. AlNiCo magnets: aluminum, nickel, cobalt, iron and other trace metals consisting of an alloy. Casting process can be 

processed into different sizes and shapes, machinability is very good. Cast aluminum nickel cobalt permanent magnet has a 

minimum reversible temperature coefficient, the working temperature can be as high as 600 degrees Celsius. AlNiCo permanent

magnet products are widely used in various instrumentation and other applications.

4, SmCo magnets. Because of its expensive materials and its development is limited. SmCo as a rare earth permanent magnet, not only has a high energy product, reliable coercivity and good temperature characteristics. Compared with NdFeB magnets, samarium

cobalt magnet is more suitable for working in high temperature environments.