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| Oxidation and corrosion behaviors of NdFeB Magnet prepared by spark plasma sintering |
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| 北京工业大学材料学院功能材料研究所 |
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Cite this article:
. Oxidation and corrosion behaviors of NdFeB Magnet prepared by spark plasma sintering. Chin J Mater Res, 2004, 18(2): 167-170.
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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 microstructures and compositions of the
magnets were observed with scanning electron microscope and energy
dispersive X--ray detector. Compared with conventional sintered NdFeB
magnet, the SPS processed magnet has an original microstructure, i.e.
the grain size of the Nd$_{2}$Fe$_{14}$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.
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Received: 21 May 2004
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