Preparation of sintered magnets
First Claim
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1. A process for preparing a sintered magnet, comprising the steps of:
- (a) press molding a magnetic powder into a compact in an applied magnetic field, said compact having coordinates (X/Sx, Y/Sy, Z/Sz) where Sx, Sy and Sz are predetermined factors of shrinkage occurring in a magnetization direction and directions perpendicular to the magnetization direction upon subsequent sintering, and(b) sintering the compact into a sintered magnet having a major axis and an axis of easy magnetization oriented at an angle to the major axis, the sintered magnet having coordinates (X, Y, Z) with X axis aligned with the axis of easy magnetization of the sintered magnet.
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Abstract
A sintered magnet of Fe-B-rare earth alloy having an axis of easy magnetization oriented at an angle to a major axis can be directly produced from the alloy material by (a) press molding the material in an applied magnetic field into a compact of the dimensions determined by taking into account factors of shrinkage expected in X, Y and Z directions, and (b) sintering the compact.
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14 Claims
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1. A process for preparing a sintered magnet, comprising the steps of:
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(a) press molding a magnetic powder into a compact in an applied magnetic field, said compact having coordinates (X/Sx, Y/Sy, Z/Sz) where Sx, Sy and Sz are predetermined factors of shrinkage occurring in a magnetization direction and directions perpendicular to the magnetization direction upon subsequent sintering, and (b) sintering the compact into a sintered magnet having a major axis and an axis of easy magnetization oriented at an angle to the major axis, the sintered magnet having coordinates (X, Y, Z) with X axis aligned with the axis of easy magnetization of the sintered magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for fabricating a sintered magnet assembly, comprising the steps of:
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(a) press molding a magnetic powder into a compact in an applied magnetic field, said compact having coordinates (X/Sx, Y/Sy, Z/Sz) where Sx, Sy and Sz are predetermined factors of shrinkage occurring in a magnetization direction and directions perpendicular to the magnetization direction upon subsequent sintering, (b) sintering the compact into a sintered magnet having parallel extending major surfaces with two parallel extending sides and having a major axis within the plane of the major surface and an axis of easy magnetization oriented at an angle to the major axis, the sintered magnet having coordinates (X, Y, Z) with X axis aligned with the axis of easy magnetization of the sintered magnet, (c) repeating steps (a) and (b) to prepare a plurality of sintered magnets having axes of easy magnetization oriented at different angles to the respective major axes, and (d) arranging the plurality of sintered magnets in a ring configuration whereby a predetermined magnetic field is produced within the ring. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification