NdFeB permanent magnets are produced out of rare earths, besides Neodymium, Praseodymium, Dysprosium and Terbium is used to achieve the desired magnetic properties. Based on the outstanding magnetic properties, NdFeB permanent magnets achieve the highest energies densities. Due to the tetragonal crystal structure the Nd2Fe14B compound can create up to 62MGOe in energy density.
The application fields for NdFeB magnets range from simple holding magnets up to high-end applications for the aerospace industry. Some examples for different application types you can find here. Because of the high variety in different application fields there is many different NdFeB materials. With adaptions in the material composition the temperature resistance, magnetic properties and other parameters can be adapted, to achieve the best results for the desired application.
If NdFeB magnets are compared with SmCo permanent magnets, there are two big drawbacks on the NdFeB side. Next to the low Curie Temperature, which results in higher temperature coefficients of the remanence and the coercivity. As the corrosion sensitivity due to the Neodymium in the material matrix.
The result of the R&D activities of BEC are to overcome these drawbacks with process optimizations and substitutions in the material phase a higher temperature stability is created as well as a lower corrosion sensitivity. Therefore, all BEC TERRAMAG® Grades are classified with the coercivity HcJ at 150°C.
Because of increasing raw material prices, especially for heavy rare earths, and the idea of sustainable resource management we developed the TERRAMAG® Light family. As the name is identifying these NdFeB materials can be produced with less or without any content of heavy rare earth elements, but with the same magnetic properties.