China permanent magnet manufacturer:

Is the Curie temperature of a magnet the highest working temperature of a magnet?

As for the Curie temperature of magnets, many people will ask whether the Curie temperature of magnets is the highest working temperature of magnets?

Let’s take a look at the introduction of Curie temperature

Curie temperature is the temperature at which a material can change between ferromagnet and paramagnetic. When the temperature is lower than Curie temperature, the material becomes a ferromagnet, and the magnetic field related to the material is difficult to change. When the temperature is higher than the Curie temperature, the material becomes paramagnetic, and the magnetic field of the magnet is easy to change with the change of the surrounding magnetic field.

1545374099627798 - Is the Curie temperature of a magnet the highest working temperature of a magnet?

What is the Curie temperature of common ferrite, NdFeB, alnico?

It is reported that the Curie temperature of ferrite is about 450 ℃, that of NdFeB magnet is 320-380 ℃, and that of alnico is 860-900 ℃.

What is their working temperature?

The working temperature of ferrite magnet is 80-100 ℃, and the high temperature resistant type can reach 350 ℃; the working temperature of NdFeB magnet is 80-220 ℃; the working temperature of SmCo magnet is 250-350 ℃; the working temperature of alnico magnet is 450-900 ℃.
Working temperature means that the magnetic force will decrease when the temperature rises in this temperature range, but most of the magnetic force will recover after cooling. Every kind of magnet has the highest working temperature. Beyond this temperature, the magnetic property will drop sharply, and even if it returns to normal temperature, the faded magnetism can not be recovered.

What does the Curie point have to do with?

The Curie point is related to the crystal structure of the sintered magnet, the impurities in the magnet, the cooling environment, the alloy composition ratio, and the specific sintering process, such as proportioning, smelting, ingot making, powder making, molding, sintering and tempering, magnetic detection, grinding, pin cutting, electroplating and finished products. Among them, proportioning is the basis and sintering tempering is the key.



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