PURPOSE: To produce a permanent magnet having magnetic anisotropy and high magnetic characteristics by heating a cast alloy expressed by the specific formula to a specified temp. and hot rolling the alloy simultaneously in the direction perpendicular to the direction where columnar metallic structure grows.
CONSTITUTION: The alloy expressed by the general formula R (T1-yMy)z is cast where R is a rare earth elements including Y; T are transition metals essentially consisting of Fe alone or Fe and Co; M consists of a combination of elements selected from B, C, P, Si, Ge, Bi, Al, etc., and 0.01<y<0.15, 4<z<8. This cast alloy is heated to 500W1,000°C and is hot rolled in such a manner that a stress is impressed in the direction perpendicular to the growth direction of the columnar crystal metal structure to finely divide the cast body to 10W1,000μ particles. After this magnetic powder is oriented in a magnetic field and is compressively molded, the powder is bonded by resins and is injection- molded in a magnetic field. Magnetic anisotropy is thereby easily obtd. and a permanent magnet having good squarness ratio is produced.
TAKAHASHI KATSUMI
IMAIZUMI NOBUO
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