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Heat-deformable magnet and method for preparing said heat-deformable magnet

A thermal deformation and magnet technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of not overcoming the coarse equiaxed grains or coarse grain areas, and the inability to realize residual magnetism, etc.

Active Publication Date: 2021-09-28
ROBERT BOSCH GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For traditional thermally deformable magnets, remanence up to 1.45T or higher is usually not achievable due to the presence of coarse grained regions
[0006] Although great efforts have been made in the prior art for the design of alloy compositions and preparation methods of rare earth / iron / boron-based magnetic powders and hot-deformed magnets, for known magnetic powders and hot-deformed magnets, there is still no overcoming Problems with axial grains or coarse grained regions

Method used

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  • Heat-deformable magnet and method for preparing said heat-deformable magnet

Examples

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Embodiment

[0099] 1) Preparation of magnetic powder

[0100] The feedstocks according to the alloy compositions as listed in Table 1 were melted in argon at temperatures in excess of 1000°C until homogeneous and cast into ingots. The ingot was remelted in argon at a temperature of over 1000°C, and then sprayed on a copper wheel with a peripheral speed of 20m / s to obtain a melt-quenched belt. The melt-quenched ribbon is then crushed into magnetic powder with a length of less than 200 μm.

[0101] Table 1 : Alloy compositions according to examples 1 to 19 (all in atomic %)

[0102] Example Nd Fe Co B Al Ga Nb Cu 1 12.83 75.97 4.5 5.31 0.43 0.53 0 0 2 12.59 75.67 4.5 5.44 0.67 0.52 0.21 0 3 12.9 75.21 4.49 5.52 0.55 0.51 0.4 0 4 13.09 74.87 4.49 5.56 0.48 0.52 0.64 0 5 13.41 75.42 4.33 5.3 0.31 0.51 0.22 0.19 6 14.42 75.33 4.5 5.22 0 0.53 0 0 7 14.42 75.13 4.5 5.22 0 0.53 0.2 0 8...

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Abstract

The present invention relates to a heat-deformable magnet and a method for preparing the heat-deformable magnet.

Description

technical field [0001] The present invention relates to a heat-deformable magnet and a method for preparing the heat-deformable magnet. Background technique [0002] Rare-earth / iron / boron-based permanent magnets usually exhibit high remanence and coercivity, providing high magnetic flux in a specific temperature range (e.g. –40 to 180°C for EV / HEV traction motors) and enabling the motor to have Excellent performance such as high power density, high torque density and high efficiency. [0003] Coercivity is a measure of the magnetic field that reduces the magnetization of a permanent magnet to zero. It represents the ability of a permanent magnet to generate a magnetic flux that opposes a demagnetizing field, and also represents the ability of a permanent magnet to generate a magnetic flux that withstands high operating temperatures. [0004] Remanence represents a measure of the maximum magnetic flux a permanent magnet can generate. It represents the ability of a permanen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057
CPCH01F1/0576
Inventor 唐鑫H·塞佩赫里-阿明大久保忠勝宝野和博喻家庆陈必成W·皮珀J·奥伯勒
Owner ROBERT BOSCH GMBH
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