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How to distinguish between bonded NdFeB magnets and sintered NdFeB magnets
Wed Nov 2021ADMIN

Neodymium magnets, referred to as neodymium iron boron magnets, are the general name for strong magnets. Its chemical formula is Nd2Fe14B. It is an artificial permanent magnet. It has the strongest magnetic force so far. The material grade is N35≤N52. It can be processed into different shapes according to different requirements. Magnets, such as tiles, blocks, punching, magnetism, magnet bars, protrusions, ladders, etc.


So, how to distinguish between bonded NdFeB magnets and sintered NdFeB magnets? In fact, these two types of magnets belong to neodymium, iron and boron. These two types of magnets are classified according to their production process. The bonded Nd-Fe-B is actually formed by injection molding, while the sintered Nd-Fe -B magnet is formed by extracting space and then heating at high temperature.


1. The bonded neodymium iron boron magnet is injection molded and contains a binder. Its density is generally only 80% of the theoretical density. The junction neodymium iron boron magnet is formed by high temperature heating in a complicated process, and its magnetic performance is better than that of sintered Nd. -Fe-B is about 30% lower.


2. The sintered Nd-Fe-B strong magnetic field is an anisotropic magnet produced by powder sintering. Under normal circumstances, only sintering can produce a blank, and then processing (such as wire cutting, slicing, grinding, etc.. It can be turned into various shapes of magnets. Sintered NdFeB magnet is a hard and brittle material that is not easy to process. In the process Among them, the loss is large, the cost is high, the dimensional accuracy is poor, the corrosion resistance is poor, and the surface needs to be electroplated. But its advantage is high performance, and it has reached more than 500,000.


3. Combined, the bonded NdFeB magnet is about 5% of the sintered magnet. At present, the magnetic energy product of sintered Nd-Fe-B magnet can reach more than 50m, while the magnetic energy product of bonded magnet is generally below 10m, which is only 12m. . The performance of bonded magnets with magnetic powder is generally 15m, and the maximum amount is 10.5m. Therefore, sintered Nd-Fe-B is more widely used than bonded Nd-Fe-B.


I believe that through the understanding of the above content, you should have the answer to how to distinguish between bonded NdFeB magnets and sintered NdFeB magnets.

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