What is the difference between neodymium magnet and AlNiCo Magnet?

1. it can be judged by appearance

Neodymium magnet has weak oxidation resistance and is easy to corrode, so the surface usually needs to be plated with various coatings, while AlNiCo Magnet has relatively good corrosion resistance and can usually be directly exposed to the air. Therefore, observing whether the magnet has a coating can distinguish the two magnets.

AlNiCo Magnet

Neodymium magnet

2. material

If conditions permit, damage tests can be carried out. The fracture surfaces of the two magnets are different due to different materials.

Nd-Fe-B is a very fine crystal with fine fracture; The section of Al Ni Co is relatively rough, and the crystal particles are larger.

3. demagnetization curve detector

On the demagnetization detector, different demagnetization curves will be obtained due to the different remanence of the two, and the remanence of Nd-Fe-B is higher.

4. temperature resistance test

In terms of temperature resistance, Nd-Fe-B can only withstand a high temperature of 240 ° at most, while al Ni Co can reach more than 600 ° C. the two magnets can be easily distinguished through the temperature resistance test.

5. magnetic force

Alnico has very weak magnetic properties, and is usually used in various instruments and meters. The neodymium magnet magnet, known as magneto king, has very strong magnetic properties. Take two magnets of similar size and test the magnetic force respectively to distinguish them.

6. density

The density of Nd-Fe-B is 7.6-7.6g/cm3, while that of Al Ni Co is 7.3-7.4g/cm3, which is not very different.

7. price

Because the alnico magnet is composed of strategic resources cobalt and nickel, it is expensive. If it is not necessary, it is usually rarely used by customers and is mostly replaced by neodymium magnet.

The application fields of alnico involve aerospace, military field, automobile industry and security system.