Yantai Shandong China [email protected]

Address

high magnetism ndfeb magnetic separator for medicine

high magnetism ndfeb magnetic separator for medicine

How Are Sintered NdFeB Magnets Made Stanford Magnets

The composition design of sintered NdFeB is very important, it relates to whether the product quality and magnetic performance indicators can meet customer requirements. Because many intrinsic magnetic properties of materials, such as magnetic polarization, Curie temperature, etc., are determined by the composition of the material. The basic principle of composition design is to ensure a sufficiently high intrinsic performance, while comprehensively considering the material cost.

See full list on stanfordmagnets

Smelting is the first process for sintered NdFeB magnets to enter the production process. The smelting furnace produces alloy spun strips. The process requires furnace temperature to reach about 1300 degrees and lasts for four hours to complete.

See full list on stanfordmagnets

The purpose of powder milling is to crush large alloy ingots into powders of a certain size. In order to obtain a well oriented magnet, the powder particles are required to have a small size and concentrated size distribution, and the powder particles are spherical or nearly spherical.

See full list on stanfordmagnets

Powder magnetic field orientation is one of the key technologies for producing high performance sintered NdFeB. After the crushed magnetic powder is put into the mold, an external magnetic field is applied for orientation, and the powder is compacted after the orientation. There are three types of molding methods commonly used at present: membrane pressure method, mold pressing and cooling isostatic pressing, and rubber mold isostatic pressing. In the case of the same neodymium content, the isostatic pressing of the rubber mold can obtain a larger magnetic energy product.

See full list on stanfordmagnets

The relative density of the sintered NdFeB powder compact is relatively high, the contact between the particles is mechanical contact, and the bonding strength is low. In order to further increase the density, improve the contact properties between the powder particles, increase the strength, and make the magnet have the microstructure characteristics of high permanent magnetic performance, the compact needs to be heated to a temperature below the melting point of the basic phase of the powder and heat treated for a period of time. This process is called sintering. After the sintered magnet is quenched at high temperature, the grain boundary phase distribution is uneven and the grain boundary is not clear. Therefore, it is necessary to perform tempering treatment at a certain temperature to optimize the structure and obtain the best magnetic properties. Tempering refers to cooling the sintered magnetic powder to a certain temperature and then heating it up again. The tempering tempe...

See full list on stanfordmagnets

In practical applications, the shapes of sintered NdFeB magnets are diverse, such as discs, cylinders, rings, squares, tiles, sectors, and various irregular shapes. Due to the different shapes and sizes of the permanent magnet elements, in the production process, except for the large sized regular permanent magnet elements, it is difficult to form other magnets at one time. Therefore, in the powder metallurgy process, a large billet is first produced, after sintering and tempering treatment, and then through mechanical processing, grinding processing, and surface coating treatment to produce magnetic materials of the shape and size that meet the needs of customers. There are 3 types of machining, including: 1. Cutting Processing: cut cylindrical and square columnar magnets into disc shaped and square shaped elements. 2. Shape Processing: process round and square magnets into fan shaped, tile shaped, or grooved, or other complex shaped magnets. 3. Punching Processing: Process round b...

See full list on stanfordmagnets

Thank you for reading our article and we hope it can help you to knowhow are sintered NdFeB magnets made better. If you want to learn more about NdFeB magnets, we would like to advise you to visit Stanford Magnetsfor more information. As a leading magnet supplier across the world, Stanford Magnets has been involved in RD, manufacturing, and sales of magnets since the 1990s. It provides customers with high quality permanent magnets like SmCo magnets, neodymium magnets, AlNiCo magnets, and ferrite magnets at a very competitive price.

See full list on stanfordmagnets

Call Us +86
15903396981
whatsapp
whatsapp