A Hydrogen Decrepitation Press-Less Process (HD-PLP) recycling method for recycling of anisotropic NdFeB magnets is demonstrated. The method combines hydrogen decrepitation (HD) disintegration of the initial magnet, powder sieving and the Press-Less Process (PLP), where hydride powder is sintered in a graphite mold. Coercivities up to 534 kA/m were obtained in porous samples based on powder size d < 100 μm. Adding a ball milling step resulted in full density isotropic magnets for d > 100 μm. The coercivity reached Hci = 957 kA/m being 86 % of the original N48M material without addition of rare earth elements.
- NdFeB sintered magnet
- Press-Less Process
Xia, M., Abrahamsen, A. B., Bahl, C., Veluri, B., Søegaard, A. I., & Bøjsøe, P. (2017). Hydrogen Decrepitation Press-Less Process Recycling of NdFeB sintered magnets. Journal of Magnetism and Magnetic Materials, 441, 55-61. https://doi.org/10.1016/j.jmmm.2017.01.049