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Are magnets still magnetic at high temperatures?

Are magnets still magnetic at high temperatures? Ask this question a little more people, so I still come to nag a few words.

Whether magnets are still magnetic at high temperatures depends on the type and material properties. Generally speaking, magnetism decreases as the temperature increases until it is completely lost at a specific temperature, a critical temperature that varies from material to material and may exceed the normal ambient temperature.

Ceramic Ferrite Magnets: Ferrite magnets retain some degree of magnetism at relatively high temperatures, but their magnetic properties gradually diminish as the temperature increases. Ferrite magnets are usually able to function properly at higher temperatures (e.g., 200°C), but their magnetism decreases dramatically above their Curie temperature (about 450°C-460°C).

Illustration shows curved ferrite permanent magnets


Rare-earth NdFeB magnets: NdFeB magnets are very sensitive to temperature, this point is known to many people, the ordinary grade temperature resistance of 80 ° C, more than its Curie temperature (about 310 ° C to 400 ° C), the magnetism will be completely lost.

Alnico magnets: Alnico magnets are more stable at high temperatures than other magnets, and are usually able to maintain some degree of magnetism at higher temperatures (up to 500°C or more).

In general, the magnetic properties of magnets are affected at high temperatures, and the various types of magnets have different temperature characteristics. Therefore, when using magnets in high temperature environments, it is important to consider their temperature stability and select the right material to ensure that they maintain good magnetic properties over the desired temperature range.

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