'The main factors that affect and lead to the demagnetization of neodymium magnets are high temperature, raw material quality, high-frequency impact, and strong magnetic field.'
Neodymium magnets are composed of rare earth (praseodymium & neodymium), iron and other elements. At present, neodymium magnet materials are widely used, but these magnets often encounter weakening or disappearing of magnetic force during use. We conclude that this situation mainly occurs after the following operations:
1. Demagnetization after injection. The minimum temperature resistance of N grades is 80°C, and the injection temperature is basically maintained above 120°C, so injection molding in 2 to 3 seconds will cause partial demagnetization.
2. Demagnetization after hot pressing. Commonly, magnets are hot pressed by glass fiber board and the temperature is above 150℃.
3. Magnet is demagnetized after baking.
4. The magnet material contains too many impurities, which leads to weak magnetic field.
5. High-frequency impacts during transportation.
6. The material contains metal stubbornness which causes the magnet will be powdered.
7. The magnetic environment causes the magnetic force to disappear or the N and S poles to change (for example: magnetizer, demagnetizer).
Analyzing and summarizing the above situation, the main factors that affect and lead to the demagnetization of neodymium magnets are the following four points: high temperature, raw material quality, high-frequency impact, and magnetic field.
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