one: English: Curie temperature: The Curie temperature
Two: definition: also called Curie Curie point temperature or magnetic transitionpoint, refers to the material can change between the ferromagnet Heshun magnet temperature, phase transition temperature of ferroelectric ferroelectric phase is transformed from the paraelectric phase lead.
Three: with the increase of temperature due to the thermal oscillation elementary particle of matter internal intensifies, micro magnetic dipole magnetic material internal arrangement gradually disorder, exhibited the magnetic polarization of J material decreases with increasing temperature, when the temperature rises to a certain value, magnetic polarization of J material is reduced to 0, at the moment of magnetic material magnetic properties become like air and other non magnetic material, the temperature called the Curie temperature Tc of the material. The Curie temperature of Tc only and the composition of the alloy is related, has nothing to do with the microstructure morphology and distribution of materials.
Four: in a certain temperature magnetic properties index compared with room temperature decrease a prescribed amplitude, the temperature is known as the Tw working temperature of the magnet. Due to the magnetic properties of the lower amplitude need application conditions depending on the magnet and request, therefore, Tw can work temperature so-called magnet is a required value for the same magnet, that is to say, with a permanent magnet can have different but working temperature of Tw in different applications. Obviously, the Curie temperature of Tc magnetic material represents the theoretical work temperature limit of the material. In fact, the permanent magnetic material can be actual work of Tw is far lower than Tc. For example, Nd-Fe-B magnet net three yuan of Tc to 312 DEG C, and the actual work is usually less than 100 DEG C Tw. The heavy rare earth metal, Co, Ga and other elements are added to the Nd-Fe-B alloy, can significantly increase the Nd-Fe-B magnet Tc and can work in Tw. It is worth noting that any permanent magnets can work Tw is not only related with the magnet and magnet is Tc, the jHc index, the magnetic properties of magnets in the magnetic circuit and the working state of the relevant. |
