iron boron, also known as neodymium iron boron magnet (NdFeBmagnet), is a tetragonal crystal formed by neodymium, iron, and boron (Nd2Fe14B). Neodymium magnets were discovered in 1982 by Shinzo Sagawa (MasatoSagawa) of Sumitomo Special Metals, Japan. The magnetic energy product (BHmax) of this magnet is greater than that of the samarium cobalt magnet, which is the largest magnetic energy product in the world at that time.

Later, Sumitomo Special Metals developed a successful powder metallurgy process (powdermetallurgyprocess). General Motors has successfully developed a rotary blowing melting method (melt-spinningprocess) to prepare NdFeB magnets. This magnet is the most magnetic permanent magnet today and the most commonly used rare earth magnet.

NdFeB can be maintained for a long time at room temperature, but it is a well-known thing that demagnetization will occur at high temperatures. The combination of cost and performance of NdFeB magnets makes them a popular choice for the use of traditional magnets and the creation of new product applications. In the case of a sharp increase in existing strength, a smaller magnet is allowed to be used, which is advantageous for most designs.

NdFeB magnets need to be treated carefully at high temperatures, because NdFeB magnets are easy to demagnetize at high temperatures. Below we will work with you to understand and explore the problem of high temperature demagnetization of NdFeB magnets. Due to the high content of neodymium iron in neodymium iron boron magnets, they are also easy to oxidize, so various coatings that meet these conditions depend on the operating environment of neodymium iron boron magnets. The reason why NdFeB will produce demagnetization in high temperature environment is determined by its physical structure. The reason why a general magnet can generate a magnetic field is that the electrons carried by the substance itself rotate around the atoms in accordance with the direction, thereby generating a magnetic field force, which in turn affects the surrounding related affairs.

However, the rotation of electrons around atoms in a given direction is also limited by temperature conditions. Different magnetic materials can withstand different temperatures. In the case of too high temperature, electrons will deviate from the original orbit, causing chaos. At this time, the local magnetic field of magnetic materials will be disrupted, thus demagnetization.

The temperature resistance of strong NdFeB magnets is about 200 degrees, that is, if it exceeds 200 degrees, demagnetization will occur. If the temperature is higher, demagnetization will be more serious.

Several effective solutions for high temperature demagnetization of NdFeB magnets

1. not to put NdFeB magnet products at too high a temperature, pay special attention to its critical temperature, that is, 200 degrees, timely adjust its working environment temperature, can minimize the occurrence of demagnetization.

2. is to start with technology to improve the performance of products using iron boron magnets, so that it can have a more temperature structure and is not easily affected by the environment.

3. can also choose the same energy product of high coercivity materials. If not, you have to sacrifice a little magnetic energy product and find materials with higher coercivity with lower magnetic energy product. If not, you can choose samarium cobalt. As for reversible demagnetization, you have to choose samarium cobalt.