What is Curie temperature?
What is Curie temperature? In short, the temperature at which the domain disintegrates is the curie point. With the increase of temperature, the arrangement of the micro magnetic dipole moment in the magnetic material is gradually disordered due to the intensified thermal oscillation of the basic particles in the material. On the macro level, the magnetic polarization J of the material decreases with the increase of temperature. When the temperature rises to a certain value, the magnetic polarization J of the material decreases to 0. At this time, the magnetic properties of the magnetic material become the same as those of the air and other non-magnetic materials. This temperature is called the Curie temperature (TC) of the material.
The Curie temperature TC is only related to the composition of the alloy and has nothing to do with the microstructure and distribution of the material. The Curie temperature Tc of the magnetic material represents the theoretical working temperature limit of the material.
In fact, the actual working temperature TW of permanent magnetic materials is far lower than TC, and the Curie temperature point of NdFeB is 320-380 ℃. TC is an important parameter of magnetic materials. With high Tc, the working temperature of materials can be improved, and the temperature stability of magnetic materials can also be improved. The Curie temperature of magnetic materials can be increased by adding cobalt, terbium, dysprosium and so on All of them are added with dysprosium and other materials to improve TC.
Most permanent magnet factories like to say that their magnets will never demagnetize, but everything in the world has a moving side. In fact, permanent magnets that do not demagnetize do not exist. There are many reasons for demagnetization.