The usual high temperature resistant magnets can be distinguished by four types

Update:24 Aug 2019
Summary:

High-temperature magnets of different nature have diffe […]

High-temperature magnets of different nature have different composition characteristics, and the size of the magnetic force is not the same. The usual high temperature resistant magnets can be distinguished by the following four types:
1. NdFeB high temperature resistant magnet: It is the high temperature resistant magnet with the highest commercialization function. It is called magnetic king and has a very high magnetic function. Its maximum magnetic energy product (BHmax) is higher than ferrite (Ferrite). More than double. Its own machining function is also quite good. Operating temperatures up to 200 degrees Celsius. And its texture is hard, the function is stable, and it has good cost performance, but because of its strong chemical activity, it is necessary to treat its exterior coating. (such as Zn, Ni, electrophoresis, passivation, etc.).
2. Ferrite high temperature resistant magnet: Its main raw material contains BaFe12O19 and SrFe12O19. Made by ceramic technology, the texture is hard and brittle. Because the ferrite high temperature resistant magnet has excellent temperature resistance, low price and moderate function, it has become the most widely used permanent magnet.
3. AlNiCo high temperature resistant magnet: It is an alloy composed of aluminum, nickel, cobalt, iron and other trace metal elements. Forging technology can produce different scales and shapes, and the processability is excellent. Forged AlNiCo permanent magnets have the lowest reversible temperature coefficient and can operate at temperatures above 600 degrees Celsius. AlNiCo permanent magnet products are widely used in various instruments and other fields of use.
4. SmCo is classified into SmCo5 and Sm2Co17 depending on the composition. Because of the high price of the data, its development is limited. Samarium Cobalt (SmCo), as a rare earth permanent high temperature magnet, not only has a high magnetic energy product (14-28 MGOe), firm coercivity and outstanding temperature characteristics. Compared with NdFeB high temperature resistant magnets, samarium cobalt high temperature resistant magnets are more suitable for operation in high temperature environments. The midpoint of the strip-shaped high temperature resistant magnet is suspended by a thin wire. When it stops, its two ends point to the south and north of the earth. The end pointing to the north is called the north pole or the north pole, and the end pointing to the south is the guide pole. Or S pole.