Seven Little Knowledge About Magnets

Seven little knowledge about magnets:

1. What are the types of magnets?

Classified by attributes: NdFeB magnets (powerful magnets), ferrite magnets, samarium cobalt magnets, alnico magnets, iron chromium cobalt magnets.

Classification by shape: round magnets, square magnets, tile-shaped magnets, special-shaped magnets, cylindrical magnets, etc.

2. Which type of magnet has the best magnetic properties?

The answer is NdFeB powerful magnets, which belong to the third generation of rare earth permanent magnets, also known as powerful magnets or magnet kings. Its magnetic performance is much higher than that of ferrite, alnico, and samarium cobalt magnets, and it is the magnet with the best performance and price ratio so far.

3. The maximum working temperature of magnets made of different materials

Different magnets have different maximum operating temperatures. Generally speaking, the maximum working temperature of a magnet refers to the irreversible loss of permanent magnet magnetism beyond this temperature. Ferrite permanent magnet 450℃, NdFeB 310℃, samarium cobalt 750℃, alnico 850℃.

4. How long is the life of the permanent magnet?

In theory, the permanent magnet life is permanent, but the actual working environment is different from the experiment. There are two main factors that affect the life of a magnet: corrosion and demagnetization. Like NdFeB magnets, which are easily corroded magnetic materials, electroplating and surface anticorrosion treatment must be done. If it is not treated with anticorrosion, it may be oxidized quickly and even become powder.

On the other hand, it is demagnetization. After the permanent magnet is demagnetized, its service life will be affected. Even if it is re-magnetized, it may not achieve the previous performance.

5. Common processing technology of magnets

Common processing methods include wire cutting, grinding, chamfering, electroplating, drilling, etc.

6. What material is the magnet made of?

There are many types of magnets, and the composition and materials of different types of magnets are also different. The main component of common ferrite magnets is Fe3O4, and the main components of NdFeB magnets are neodymium, iron, boron and dysprosium (Dy), praseodymium (Pr) and other rare earth metals. The main components of samarium cobalt magnets are rare earth samarium, cobalt, iron, copper and zirconium. Alnico permanent magnet is an alloy composed of aluminum, nickel, cobalt, iron and other trace metal elements.

7. What are the functions and functions of permanent magnets

Magnets are widely used, such as: permanent magnet motors, sensors, speakers, generators, magnetic therapy, hardware toys, etc.