Rare earth magnet
Rare earth magnets are used in a wide variety of applications including household electric appliances, large computer peripheral terminals, and medical equipment. Because of their excellent magnetic properties, rare earth permanent magnets constitute a family of very important electronic materials which is a key to the advanced technology. A rare-earth magnet is produced by pulverizing a magnetic alloy into powder, pressing or compacting the alloy powder in a magnetic field and then subjecting the pressed compact to a sintering process and an aging treatment. A rare earth sintered magnet is produced by pulverizing a material alloy for the rare earth magnet to obtain an alloy powder, compacting the alloy powder, sintering the compact and then subjecting the sinter to an aging treatment. A rare earth bonded magnet is manufactured by using a mixture (compound) of a rare earth magnet powder and a binding resin (binder), and molding the mixture under pressure into a desired shape. A rare earth alloy sintered magnet (permanent magnet) is normally produced by compacting a powder of a rare earth alloy, sintering the resultant compact and then subjecting the sintered body to an aging treatment. The rare earth sintered magnets extensively used today for various applications are roughly classifiable into the two types, namely, samarium-cobalt-type magnets and rare earth-iron-boron-type magnets. Among rare earth permanent magnets, an R-T-B system rare earth permanent magnet has been increasingly demanded year by year for the reasons that its magnetic properties are excellent and that its main component Nd is abundant as a source and relatively inexpensive.
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