List of Magnets That Can Withstand High Temperatures

Which magnets have high-temperature resistance properties? What is the highest temperature they can withstand? If you want to find answers to the questions above, you’ve come to the right place. In this article, we’ll take a look at the list of magnets that can withstand high temperatures.

Magnets That Can Withstand High Temperatures – 1. AlNiCo Magnet

It is an alloy composed of aluminum, nickel, cobalt, iron, and other trace metals. The casting process can be made into different sizes and shapes, with good workability. Casting Al-Ni-Co permanent magnets with high strength magnets have the lowest reversible temperature coefficient and can operate at temperatures up to 600 degrees Celsius. The AlNiCo permanent magnet products are widely used in various instruments and other applications.

Magnets That Can Withstand High Temperatures – 2. Neodymium Magnet

It is the most commercially available magnet, known as the magnet king, with extremely high magnetic properties. Its BHmax is more than 10 times higher than that of ferrite. The magnetic steel itself has excellent mechanical properties. The working temperature can reach up to 200 degrees Celsius. Powerful magnets are widely used because of their hard texture, stable performance, and good cost performance. But because of its strong chemical activity, the magnet must be treated on its surface. (for example, Zn, Ni, electrophoresis, passivation, etc.)

The magnets used in brushless motors usually choose 120 degrees -150 degrees. The neodymium magnet is classified by temperature as M (80-100 ℃), H (100-120 ℃), SH (120-150 ℃), UH (150-180 ℃), EH (180-200 ℃). The magnetic strength of NdFeB magnets is closely related to the change of ambient temperature. Within the working temperature range, the corresponding magnetic force will be weakened when the temperature rises by 1 ℃.

After cooling, most of the magnetic force can return to the original level, which is reversible. This is irreversible if the temperature reaches Curie’s and parts of the magnet move violently and demagnetize.

Magnets That Can Withstand High Temperatures – 3. SmCo Magnet

They are divided into SmCo5 and Sm2Co17 according to their components. Because of the high price of materials, their development is limited. SmCo as a rare earth permanent magnet not only has a high magnetic energy product (14-28MGOe), reliable coercivity, and good temperature characteristics. Compared with NdFeB magnets, samarium cobalt magnet is more suitable for working in the high-temperature environment.

Magnets That Can Withstand High Temperatures – 4. Ferrite Magnet

Its main raw materials include BaFe12O19 and SrFe12O19. Powerful magnets are made by ceramic technology. They are hard and brittle materials. Ferrite magnets have become the most widely used permanent magnets because of their excellent temperature resistance, low cost, and moderate performance.

Conclusion 

Thank you for reading our article and we hope it can help you to have a better understanding of the magnets that can withstand high temperatures. If you want to know more about magnets, we would advise you to visit Stanford Magnets for more information.

As a leading supplier of various kinds of magnet products across the world, Stanford Magnets has been involved in R&D, manufacturing, and sales of permanent magnets since the 1990s. Therefore, we can provide our customers with high-quality rare earth permanent magnetic products such as neodymium magnets, and other non-rare earth permanent magnets at a very competitive price.