How to distinguish between bonded NdFeB and sintered NdFeB

- Nov 24, 2017 -

In fact, these two types of magnets belong to NdFeB. The two magnets are divided according to their production process. Bonding NdFeB is actually through injection molding, and sintered NdFeB magnets is used to evacuate and then through the high temperature heating and forming. The company is located in:

Bonded NdFeB magnets contain an adhesive because they are injection molded, with a density of typically only 80% of theoretical. Sintered Nd-Fe-B magnets are heated at high temperatures through complex processes, so magnetically, bonded Nd-Fe-B decays by about 30% relative to sintered Nd-Fe-B magnets.

Sintered NdFeB is an anisotropic magnet produced by powder sintering. Generally after sintering can only produce rough, and then through the machining (such as wire cutting, slicing, grinding, etc.) to become a variety of shapes of magnets. Sintered NdFeB hard and brittle materials are hard to process, the process of loss, high cost, dimensional accuracy is relatively poor, poor corrosion resistance, the surface needs plating. But the advantage is higher performance, has been done more than 50M.

Taken together, the magnetism of the bonded NdFeB magnets is only about 5% sintered. Currently sintered NdFeB magnet energy product can reach more than 50M, while the bonded magnet is generally below 10M, the best is only 12M. The performance of magnetic powder used in bonded magnets is generally 15M, made up to a maximum of only 10.5M after bonded magnets. Therefore, the general use of sintered NdFeB Bonded NdFeB wide range.

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