Understand The Types Of High Temperature Resistant Magnets

The composition of high-temperature resistant magnets is iron, cobalt, nickel and other atoms with special internal structures, and the atoms themselves have magnetic moments. Generally, the arrangement of these mineral molecules is chaotic. And their magnetic regions influence each other and cannot exhibit magnetism, but under the guidance of an external force (such as a magnetic field), their molecular alignment tends to be consistent, exhibiting magnetism, which is commonly known as a magnet. Magnets are divided into permanent magnets and soft irons. Permanent magnets plus strong magnetism make the spin of magnetic materials and the angular momentum of electrons form a fixed direction.

High temperature resistant magnets can be divided into two categories: first, metal alloy magnets, including Nd2Fe14B, samarium cobalt magnets (SmCo) and alnico magnets; second, ferrite magnets have special internal structures and magnetic moments. Types of high-temperature magnets: shape-type high-temperature magnets: square high-temperature magnets, tile-shaped high-temperature magnets, special-shaped high-temperature magnets, cylindrical high-temperature magnets, circular high-temperature magnets, magnetic rod high-temperature magnets, magnetic frame high-temperature magnets, special high-temperature magnets: samarium cobalt magnets , NdFeB high-temperature magnets, ferrite high-temperature magnets, AlNiCo high-temperature magnets, FeCrCo high-temperature magnets, professional high-temperature magnets: magnetic components and motor high-temperature resistant permanent magnet high-temperature resistant magnets plus strong magnetism, so that the magnetic material The spins are aligned in a fixed direction with the electron's angular momentum. Apply current to the soft magnet (this is also a method of adding magnetic force), and the soft iron will gradually lose its magnetism when it is removed by the current.

High temperature resistant magnets with different properties have different composition characteristics and different magnetic forces. Generally, the different types of high temperature resistant magnets can be divided into the following four types:

1. NdFeB high temperature resistant magnet: It is a high temperature resistant magnet with a high degree of commercialization found so far, known as the magnet king. It has a very high magnetic performance, its maximum maximum magnetic energy product (BHmax) is more than 10 times higher than that of ferrite, and its own processing function is also quite good. The working temperature can reach 200 degrees Celsius, and the texture is hard, the performance is stable, and it has good cost performance. , but due to its strong chemical activity, its outer surface needs to be treated.

2. Ferrite high temperature magnet: its main raw materials include BaFe12O19 and SrFe12O19. Made of ceramic technology, the texture is relatively hard and belongs to brittle data. Because ferrite high-temperature magnets have excellent temperature resistance, low price, and moderate functions, they have become permanent magnets that are widely used.

3. Alnico high-temperature magnet: It is an alloy composed of aluminum, nickel, cobalt, iron and other trace metal elements. Forging technology can be processed into different sizes and shapes, and the machinability is very good. The reversible temperature coefficient limit of forged AlNiCo permanent magnets is low, and the working temperature can reach above 600 degrees Celsius. AlCo permanent magnets are widely used in various instruments and other fields.

4. Samarium cobalt (SmCo) is divided into SmCo5 and Sm2Co17 according to the composition. Because of the high price of its materials, its development is limited. Samarium cobalt (SmCo), as a rare earth permanent high temperature resistant magnet, not only has a high magnetic energy product (14-28MGOe), reliable coercive force and excellent temperature characteristics. Compared with NdFeB high temperature resistant magnets, SmCo high temperature resistant magnets are more suitable for working in high temperature environments. Hang the midpoint of the bar-shaped high-temperature-resistant magnet with a thin wire. When it stops, its two ends will point to the south and north of the earth. The end pointing to the north is called the north pole or N pole, and the end pointing to the south is the guide pole. or S pole.