Or neodymium magnets and ferrite magnets. From the development history of magnets, people mainly used carbon at the end of 19 and the beginning of the 20th century.
Steel, tungsten steel, chromium steel and cobalt steel are used as permanent magnet materials. At the end of 1930s, Al-Ni-Co magnet was successfully developed, which led to its large-scale application.
Use becomes possible. In 1950s, the appearance of barium ferrite magnets not only reduced the cost of permanent magnets, but also broadened the application scope of permanent magnet materials to
High frequency field. In 1960s, the appearance of samarium-cobalt permanent magnets opened up a new era for the application of magnets. Dayton, USA 1967
University Strnat, etc. The development of samarium cobalt magnet marks the arrival of the era of rare earth magnets. So far, rare earth permanent magnets have gone through the first generation.
SmCo5, the second generation precipitation hardening Sm2Co 17, has developed into the third generation NdFeB permanent magnet. At present, ferrite magnets are the most widely used.
Permanent magnet materials, but the output value of neodymium magnet has greatly exceeded that of ferrite permanent magnet materials, and the production of neodymium magnet has developed into a big industry.
The magnetic force is arranged as follows: neodymium magnet, samarium cobalt magnet, Al-Ni-Co magnet and ferrite magnet.
Manufacturing technology of magnets: neodymium magnets, samarium-cobalt magnets, Al-Ni-Co magnets and ferrite magnets are also different. 1. Nd magnet, technically, there are sintered Nd magnet and bonded Nd magnet, and we mainly say sintered Nd magnet.
Neodymium magnet process
Process flow: batching → smelting, ingot making/belt throwing → crushing → pressing → sintering and tempering → magnetic detection → grinding → pin cutting → electroplating → finished product. Among them, batching is the foundation and sintering tempering is the key.
Neodymium magnet blank production tools and performance testing tools: melting furnace, belt throwing furnace, jaw crusher, jet mill, press forming machine, vacuum packaging machine, isostatic press, sintering furnace, heat treatment vacuum furnace, magnetic performance tester and Gauss meter.
Neodymium magnet processing tools: centerless grinding, spheronization machine, double-sided grinding, plane grinding, slicer, double-sided grinding, wire cutting, bench drilling, special-shaped grinding, etc. Because NdFeB magnet is made of crushed powder, its original shape is called blank. Later, according to customer's requirements, we can process different shapes, such as disc shape, ring shape, square shape, perforated shape, trapezoid shape, concave-convex shape, running shape and some irregular shapes.