People who have used magnets may encounter such a problem: after a period of usage, the performance of their magnets is not as good as before. Why？There are a handful of reasons for the degradation of a magnet’s performance. If you want to maintain the performance of your magnets, you need to know why and when they may reduce performance. In this article, we will take a look at the 4 main factors that affect a magnet’s performance.
There are dozens of types of magnets, such as ferrite magnets, neodymium iron boron magnets, bonded neodymium iron boron, aluminum nickel cobalt, samarium cobalt magnet, ferrochrome cobalt magnet, injection ferrite, etc. And each type of magnets has a corresponding working temperature.
Generally speaking, when a magnet is in use, if the surrounding temperature is within its working temperature, there will be no demagnetization. For example, the maximum working temperature of AlNiCo magnets is about 540 °C, the maximum working temperature of SmCo magnets and ferrites is about 300 °C, and neodymium magnets and the maximum working temperature of soft magnets is about 140 °C.
However, if a magnet is placed at a temperature higher than its working temperature for a long time, the high temperature will disrupt the original movement law of the electrons inside the magnet, then the magnetic field of it will be greatly weakened, and the magnet will be partially demagnetized.
Anyone who has a certain understanding of magnets knows that magnets have N and S poles. If we use a magnet, there is another magnetic field around it, which will cancel out part of the magnet’s magnetic force. This is the reason why a magnet will also demagnetize within the working temperature.
Some magnets are more susceptible to corrosion and oxidation, such as neodymium iron boron magnets. If the humidity around the magnet is high, and the surface of the magnet is not treated with anti-corrosion or anti-oxidation, the performance and service life of the magnet will be affected.
In the process of using magnets, there may be collisions between magnets and the things around them. And as we know, one of the properties of magnets is that they are brittle, easily cracked, and lose their corners. The collision in use will cause the magnet body to wear and become smaller so that the performance of the magnet will gradually weaken.
Thank you for reading our articles and we hope it can help you to have a better understanding of the factors that affect a magnet’s performance. If you want to know more about magnets, we would like to recommend you to visit Stanford Magnets for more information.
Stanford Magnets is a leading magnet product supplier across the world who has been involved in R&D, manufacturing, and sales of permanent magnets since the 1990s. It provides customers with high-quality rare earth permanent magnetic products like neodymium magnets, and other non-rare earth permanent magnets at an affordable price.