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Production of bulk amorphous and nanocomposite Nd4Fe77.5B18.5 materials by spark plasma sintering method

Production of bulk amorphous and nanocomposite Nd4Fe77.5B18.5 materials by spark plasma sintering method,10.1109/TMAG.2004.834211,IEEE Transactions on

Production of bulk amorphous and nanocomposite Nd4Fe77.5B18.5 materials by spark plasma sintering method   (Citations: 2)
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Amorphous melt-spun ribbons of an Nd4Fe77.5B18.5 alloy were consolidated into bulk materials by a spark plasma sintering method. The resultant bulk materials were amorphous when the ribbons were consolidated at 773 K. The amorphous bulk materials showed a low coercivity as expected for amorphous Nd-Fe-B materials. Heat treatment of the bulk materials above the crystallization temperature resulted in the formation of a metastable Fe3B phase together with an Nd2Fe14B phase. The resultant nanocomposite magnets showed a coercivity as high as 2.4 kOe as was the case for the annealed melt-spun ribbons. Such a bulk nanocomposite magnet with a high coercivity could be directly produced by the spark plasma sintering method. The bulk materials consolidated at 873 K consisted of Fe3B and Nd2Fe14B phases and exhibited a high coercivity without heat treatment. The optimally annealed specimen showed a high remanence of 12 kG with the maximum energy product in excess of 10 MGOe.
Journal: IEEE Transactions on Magnetics - IEEE TRANS MAGN , vol. 40, no. 4, pp. 2880-2882, 2004
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