High Temperature Resistant Permanent Magnets List
Do you know which magnets have high temperature resistance? What are the magnets that can work at high temperature? What is the maximum temperature they can withstand? If you are looking to find the answers to the above questions, you are in the right place, in this article, we will detail for you those magnets that can withstand high temperatures.
The meaning of a high temperature magnet is a magnet that can maintain its magnetic force in a high temperature environment.
1. Magnets that can withstand high temperature – AlNiCo magnets
It is an alloy of aluminum, nickel, cobalt, iron and other trace metals, which has good machinability and can operate at temperatures up to 600 degrees Celsius.
2. Magnets that can withstand high temperature – neodymium magnets
It is the most readily available magnet on the market, known as the magnet king, with extremely high magnetic performance, its BHmax is more than 10 times higher than ferrite, and its operating temperature can reach up to 200 degrees Celsius, the neodymium iron used in brushless motors Boron magnets usually choose 120-150 degrees.
Neodymium magnets are divided into N series (＜80℃), M (＜100℃), H (＜120℃), SH (＜150℃), UH (＜180℃), EH (＜200°C).
The magnetic strength of NdFeB magnets is closely related to the change of ambient temperature. Within the operating temperature range, the corresponding magnetic force will weaken for every 1°C increase in temperature. After cooling, most of the magnetic force can return to its original level, which is reversible. This is irreversible if the temperature reaches the Curie temperature and part of the magnet moves violently and demagnetizes.
The figure below shows a comparison of key properties of samarium cobalt, neodymium iron boron, alnico and ceramic ferrite, such as cost, operating temperature, magnetic strength.
3. Magnets that can withstand high temperature – SmCo magnets
They are classified into SmCo5 and Sm2Co17 according to their composition, and their development is limited due to the expensive materials. As a rare earth permanent magnet, samarium cobalt not only has a high magnetic energy product (14-28MGOe), but also has reliable coercivity and good temperature characteristics. Compared with NdFeB magnets, sa cobalt magnets are more suitable for working in high temperature environment, and its working temperature can reach 250-350 degrees Celsius.
4. Magnets that can withstand high temperature – ferrite magnets
Its main raw materials include BaFe12O19 and SrFe12O19, and its heat-resistant working temperature upper limit is 250°C. It is the most widely used permanent magnet due to its excellent temperature resistance, low cost and moderate performance.
5. Magnets that can withstand high temperature – iron chromium cobalt
The maximum operating temperature of iron-chromium-cobalt permanent magnets is 400 ° C, so it can maintain magnetic properties below 400 degrees.
The above is the list of permanent magnets that can withstand high temperature. You can choose according to the magnetic requirements. If you want to know the price of magnets, please contact our company.
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