#Permanent Round NdFeB Perforated Magnet

[malimagnet]

Permanent Round NdFeB Perforated Magnet

It offers great resistance to demagnetization, corrosion, high and low temperatures, shock, and abrasion. Their strong magnetic field and superb resistance to demagnetization are achieved by using a combination of soft iron and hard magnetic alloys. These are manufactured in a unique way and require special equipment, resulting in higher production costs.

[jinlun]

How to distinguish bonded NdFeB and sintered NdFeB?

Neodymium magnets can be called neodymium iron boron magnets, which is a general term for powerful magnets. Its chemical formula is Nd2Fe14B. It is an artificial permanent magnet and has the strongest magnetic force so far. The material grades of neodymium iron boron magnets are N35-N52; the shapes can be processed into different shapes according to specific requirements, including round, square, perforated, magnetic tile, magnetic rod, convex or trapezoidal, etc.

How to distinguish bonded NdFeB and sintered NdFeB? In fact, both types of magnets belong to NdFeB. The two types of magnets are distinguished according to their production processes. The bonded NdFeB magnet is actually formed by injection molding, while the sintered NdFeB magnet is formed by evacuating and then heating at high temperature.

Bonded neodymium iron boron magnets are formed by injection molding, so they contain adhesives, the density of which is generally only 80% of the theoretical. The sintered NdFeB magnet is heated at a high temperature through a complicated process. Therefore, the bonded NdFeB magnet is attenuated by about 30% compared with the sintered NdFeB magnet.

Sintered NdFeB magnet is an anisotropic magnet produced by powder sintering method. Generally, only a blank can be produced through sintering, and then through mechanical processing (such as wire cutting, slicing, grinding, etc.) to become magnets of various shapes. Sintered NdFeB is a hard and brittle material that is difficult to process. It has high loss during processing, high cost, poor dimensional accuracy, poor corrosion resistance, and the surface needs to be electroplated. But the advantage is that the performance is higher, and it has achieved more than 50M.

In summary, the magnetic properties of bonded NdFeB magnets are only about 5% of that of sintered. At present, the energy product of sintered NdFeB magnets can reach more than 50M, while the bonded magnets are generally below 10M, and the best is only 12M. The performance of the magnetic powder used in bonded magnets is generally 15M, and it is only 10.5M at most after being made into bonded magnets. Therefore, sintered NdFeB is generally used in a wider range than bonded NdFeB.