Sintering Process of NdFeB Magnet
“Sintering” of the production process of NdFeB magnet manufacturers
The fifth step of the key process of the production process of NdFeB magnet manufacturers: sintering. This is our first performance test for this batch of products. We put our pressed blanks into the sintering process, and will burn out the standard samples together to test whether the performance can meet the customer’s standards. Then test the graph.
The powder compact after powder compression molding has a relatively low relative density, a large porosity, and a low bonding strength between the particles. Such a powder compact does not have the microstructure of a high magnetic performance magnet. In order to further increase the density, improve the direct contact property of the powder, increase the strength, and make the magnet have the microstructure characteristics of high permanent magnet properties, it is necessary to heat the compact to a temperature at which the melting point of the powder collective phase is subjected to heat treatment for a certain period of time. It is called sintering.
The sintering process of NdFeB magnet manufacturers causes a series of physical and chemical changes in the compact, which is one of the key technologies for the manufacture of NdFeB magnets and has an important influence on the performance of permanent magnets. After the NdFeB permanent magnet alloy is sintered and rapidly cooled (sintered state), the magnetic properties are low, and it needs to be tempered and heat treated, and the treatment temperature is generally slightly lower than the sintering temperature. The tempering treatment can significantly improve the magnetic properties of the NdFeB alloy, especially the coercive force. Magnetic properties are very sensitive to process factors. The alloys of the same composition can vary several times, several times, or even hundreds of times due to different sintering and heat treatment processes. Therefore, it is very important to master the influence of sintering and heat treatment processes on magnetic properties.
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