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AssigneeMitsubishi Kinzoku Kabushiki Kaisha
InventorsTakuo Takeshita, Ryoji Nakayama, Tamotsu Ogawa
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In a rare earth-iron-boron alloy magnet powder, each individual particle includes a recrystallized grain structure containing a R.sub.2 Fe.sub.14 B intermetallic compound phase as a principal phase thereof, wherein R represents a rare earth element. The intermetallic compound phase are formed of recrystallized grains of a tetragonal crystal structure having an average crystal grain size of 0.05 .mu.m to 50 .mu.m. For producing the above magnet powder, a rear earth-iron-boron alloy material is first prepared. Then, hydrogen is occluded into the alloy material by holding the material at a temperature of 500.degree. C. to 1,000.degree. C. either in an atmosphere of hydrogen gas or in an atmosphere of hydrogen and inert gases. Subsequently, the alloy material is subjected to dehydrogenation at a temperature of 500.degree. C. to 1,000.degree. C. until the pressure of hydrogen in the atmosphere is decreased to no greater than 1.times.10.sup.-1 torr, and is subjected to cooling.
In a rare earth-iron-boron alloy magnet powder, each individual particle of said powder comprising an aggregate structure of recrystallized grains consisting essentially of recrystallized grains of a R.sub.2 Fe.sub.14 B intermetallic compound phase, wherein R represents a rare earth element, said intermetallic compound phase consisting of recrystallized grains of a tetragonal crystal structure having an average crystal grain size of 0.05 .mu.mm to 50 .mu.mm.
Dependencies are inferred from the claim text.