2004•Cailiao yanjiu xuebaoRequires access
Oxidation and corrosion behaviors of NdFeB Magnet prepared by spark plasma sintering
Min Yue
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Abstract
Anisotropic NdFeB magnet was prepared by spark plasma sintering(SPS)technique.
Magnet with same composition was produced using conventional sintering method for comparison. The
electrochemical properties in electrolytes and reaction kinetics in oxidizing environments of the magnets
were studied. The microstructure and compositions of the magnets were observed with scanning
electron microscope and energy dispersive X-ray detector. Compared with conventional sintered NdFeB
maggnet,the SPS processed magnet has an original microstructure,i.6.the grain size of the Nd_2Fe_(14)B
main phase is fine and uniform,and the fine Nd-rich phase does not form along the grain boundaries
of main phase,but agglomerates into the triple junctions.Therefore,the pathways for corrosion
propagation are restricted and the inter-granular corrosion process is suppressed effectively. As a result.
the SPS NdFeB magnet possesses an excellent corrosion resistance.