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AssigneeSeiko Epson Corporation
InventorsKoji Akioka, Osamu Kobayashi, Tatsuya Shimoda
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A rare earth-iron permanent magnet which is formed from an ingot of an alloy composed of at least one rare earth element represented by R, Fe, B and Cu, by the hot working at 500.degree. C. or above which refines the crystal grains and make them magnetically anisotropic. A process for producing a rare earth-iron permanent magnet by subjecting the ingot of said alloy to hot working at 500.degree. C. or above. The permanent magnet is equal or superior in magnetic performance to conventional permanent magnets produced by sintering method. The process is simple and able to provides permanent magnets of low price and high performance. In addition, an isotropic rare earth-iron permanent magnet is obtained if said ingot undergoes heat treatment at 250.degree. C. or above.
A rare earth-iron permanent magnet, comprising a cast ingot of an alloy consisting essentially of at least one rare earth element represented by R, and Fe, B, and Cu which has been subjected to hot working at 500.degree. C. or above which finely refines the crystal grains and makes them magnetically anisotropic.
An isotropic rare earth-iron permanent magnet having an improved coercive force comprising a cast ingot of an RFeB alloy having a main phase of R.sub.2 Fe.sub.14 B.sub.1 consisting essentially of 8-30% of at least one rare earth element represented by R, 2-28% of B, and 6% or less of Cu, with the remainder being Fe and unavoidable impurities and which has been subjected to heat treatment at 250.degree. C. or above.
An anisotropic powder bonded rare earth-iron permanent magnet which comprises a powder of an alloy composition consisting essentially of at least one rare earth element represented by R, and Fe, B, and Cu, said alloy formed by casting an ingot of said composition and pulverizing the case ingot to form the powder, and an organic binder, the magnet being anisotropic.
Dependencies are inferred from the claim text.