In short, if neodymium-iron-boron magnets lacks neodymium, the remanence(Br) may be reduced, that is to say, the magnetism is weak. If a high grade permanent magnet with dysprosium(Dy),which lacks Dy,the grade and coercivity may be reduced, which can be understood as the reduction of high temperature resistance
What is the percentage of dysprosium(Dy) in each grade of neodymium-iron-boron(NdFeB)?
The content of dysprosium added to the grade-N NdFeB: 0-0.5%
The content of dysprosium added to the grade-M NdFeB: 0-1%
The content of dysprosium added to the grade-H NdFeB: 0-2%
The content of dysprosium added to the grade-SH NdFeB: 1-4.5%
The content of dysprosium added to the grade-UH NdFeB: 3-6%
The content of dysprosium added to the grade-EH NdFeB: 4-10%
The above data is empirical value, not fixed value, for reference only!
Through the above introduction, we can know that the main purpose of adding dysprosium(Dy) to NdFeB magnets is to improve the temperature resistance. The more the neodymium magnets are added, the better the temperature resistance is.
