Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8152476 | Journal of Magnetism and Magnetic Materials | 2018 | 30 Pages |
Abstract
The anisotropic parylene-coated bonded NdFeB magnets with parylene C coating on the surface of NdFeB powders are prepared by warm compaction process. The parylene C coating is characterized by focused ion beam-scanning electron microscopy (FIB-SEM) and energy dispersive X-ray Spectroscopy (EDS), revealing a parylene C film of 300-500â¯nm thickness on the surface of NdFeB powders. The parylene-coated NdFeB magnets show excellent magnetic properties of maximum energy product ((BH)max, 104â¯kJ/m3), degree of alignment (DOA, 0.476) and density (6.17â¯g/cm3) than non-coated NdFeB magnets (60â¯kJ/m3, 0.337, 5.72â¯g/cm3). And with the increasing thickness of parylene C coating, (BH)max and density increase first, and then decrease while DOA keeps a growing trend all the time. The parylene-coated NdFeB magnets also exhibit better corrosion resistance according electrochemical test. The mechanisms for the improvement of magnetic properties and corrosion resistance are the good lubricating property and super chemical stability of parylene C coating on the surface of NdFeB powders.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Bin Ma, Aizhi Sun, Xuexu Gao, Xiaoqian Bao, Jiheng Li,