Abstract
The NdFeB magnetic powder used today to produce bonded Nd magnets is produced by melt spinning, a rapid solidification process, which involves directing a molten stream of alloy onto the surface of a water-cooled, rapidly rotating rim. This chapter discusses the equipment, technology, and processing procedures used for high-volume commercial production of melt-spun NdFeB magnetic powder, including early development and some of the technical problems encountered. Also discussed are the postmelt-spinning processing procedures needed to produce a commercial, press-ready powder, including quality assurance procedures. Finally, the various grades of melt-spun powder that are now commercially available today are reviewed and their properties compared. This chapter concludes with a discussion of the gas-atomization process, which is another rapid solidification technique that is currently used to produce NdFeB magnetic powder, and the advantages and disadvantages of this process are discussed.
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