It is very important to know the maximum operating temperature of each grade of the magnet in the application of the NdFeB magnet. NdFeB magnets work best at lower temperatures and become even stronger when the temperature drops to about -130 ° C. However, some grades of NdFeB magnets can also be exposed to very high temperatures before the change of their properties and the loss of their magnetism, either temporarily or permanently. Then how does temperature affect NdFeB magnets? In this article, let’s try to find out the answer.
Normally, for every 1 degree Celsius rise in temperature, NdFeB magnets lose 0.11 percent of their magnetism. As long as the maximum operating temperature is not exceeded, this small loss can be fully recovered on cooling. However, if it is exceeded, the small loss will not be recovered on cooling, and continuous hot-cold cycles will result in a decrease in magnetic properties.
Usually, there are two letters following the grade name, which determine the temperate rating and represent the maximum operating temperature the magnet can withstand before its magnetic properties are seriously affected. But these ratings should always be regarded as guidance values because other factors (such as size and shape) can also affect the performance of magnets at high temperatures.
Ordinary NdFeB magnets are strongest at temperatures below 80 ° C, but after that, they lose their magnetic output.
In addition, NdFeB magnets can be subject to permanent demagnetization fields and radiation, so it is important to always fully understand the environment in which the magnets will be used. For instance, the demagnetization temperature of a NdFeB magnet free space is lower than that of an equal-sized magnet connected to a piece of mild metal.
Magnets love cold. A NdFeB magnet will continue to work when the operating temperature drops to -130°C, at which point the direction of magnetism is said to shift, reducing performance by about 15%. Magnets really hate to be moved quickly from a very cold temperature to a very hot temperature, because this thermal shock may cause them to break or crack.
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