NdFeB magnets can be divided into bonded NdFeB magnets and sintered NdFeB magnets. Bonding is actually injection molding, and sintering is vacuum pumping through high temperature heating molding! Neodymium iron boron magnet is the most powerful permanent magnet so far. So, how to judge the quality of iron boron magnet?
First of all, we need to know what material combination it is made of. The main raw materials of Nd-Fe-B permanent magnet are rare earth metal Nd (32%), metal element Fe (64%) and non-metal element B (b) 1% (a small amount of dysprosium (Dy), terbium (TB), cobalt (CO), niobium (NB), gallium (GA), aluminum (AL), copper (Cu)). Nd2Fe14B compound is used as the matrix of Nd2Fe14B ternary permanent magnet material, and its composition should be similar to the molecular formula of Nd2Fe14B compound. However, when the distribution ratio of Nd2Fe14B is fully used, the magnetic properties of the magnet are very low or even non-magnetic. Only when the content of Nd and B in the actual magnet is more than that of Nd and B in Nd2Fe14B compound can better permanent magnetic properties be obtained. The characteristics of NdFeB determine the quality and value of NdFeB magnets. From the main raw materials of NdFeB above, we can see that NdFeB is a kind of magnetic material, which has high performance, moderate price and high strength, but it is not resistant to high temperature and corrosion.
Because the combination of NdFeB materials is very reasonable, it makes NdFeB permanent magnetic and permanent magnetic properties. Nd-Fe-B magnets have high coercive force, and the magnetic field will not change or lose its magnetism under the general conditions of natural environment and magnetic loss. After long-term use, whether the magnetic loss is too large, so it is generally ignored in the process of use, the influence of time factor on the magnetic performance. With such high magnetic properties, NdFeB magnets are becoming more and more popular, and there are more and more manufacturers of NdFeB magnets.
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