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Rare earth permanent magnet and method for producing rare earth permanent magnet

A permanent magnet, rare earth technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problem of low residual magnetic flux density of magnetic characteristics

Active Publication Date: 2018-01-02
IHI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a rare-earth permanent magnet, since the unpaired electrons that are indispensable in the magnetic body are significantly reduced, the magnetic properties, especially the residual magnetic flux density Br, are low.

Method used

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  • Rare earth permanent magnet and method for producing rare earth permanent magnet
  • Rare earth permanent magnet and method for producing rare earth permanent magnet
  • Rare earth permanent magnet and method for producing rare earth permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、 Embodiment 2

[0108] [Example 1, Example 2, Comparative Example 1]

[0109] will be image 3 The raw material alloy containing each element in the shown composition was coarsely pulverized by a ball mill to obtain alloy particles. Thereafter, the alloy particles are dispersed in a solvent. Additives are introduced into the dispersion solution and stirred to perform a reduction reaction, thereby micronizing the alloy particles.

[0110] Fill each molding cavity with micronized raw material alloy, and apply a molding pressure of 2t / cm 2 , 19kOe magnetic field for compression molding, magnetization and degreasing. The resulting molded body in 2 × 10 1 Under the vacuum condition of Torr, the Figure 4 The heat treatment process was performed under the indicated heat treatment conditions. After the heat treatment step, it was cooled to room temperature and taken out from the cavity to obtain the rare earth permanent magnets of Examples 1 and 2. Examples 1 and 2 are magnets in which the ma...

Embodiment 3 to Embodiment 5 and comparative example 2

[0139] will be Figure 10 The raw material alloy containing each element in the shown composition was coarsely pulverized by a ball mill to obtain alloy particles. Thereafter, the alloy particles are dispersed in a solvent. Additives are introduced into the dispersion solution and stirred to carry out reduction reaction, and the alloy particles are granulated.

[0140] Fill the molding cavity with the micronized raw material alloy and apply a molding pressure of 2t / cm 2 , 19kOe magnetic field for compression molding, magnetization and degreasing. The resulting molded body in 2 × 10 1 Under the vacuum condition of Torr, the Figure 17 The heat treatment process was performed under the indicated heat treatment conditions. After the heat treatment step, it was cooled to room temperature and taken out from the cavity to obtain the rare earth permanent magnets of Examples 3 to 5. Examples 3 to 5 are magnets in which the main phase is formed but the grain boundary phase is not...

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Abstract

Provided is a rare earth permanent magnet comprising a main phase including: one or more elements R selected from the group consisting of Nd and Pr; one or more elements L selected from the group consisting of Co, Be, Li, Al and Si; one or more elements A selected from the group consisting of Tb, Sm, Gd, Ho and Er; Fe; and B, wherein the crystals forming the main phase belong to P42 / mnm and some of the B atoms occupying the 4f site are substituted by element L atoms.

Description

technical field [0001] The present disclosure relates to rare earth permanent magnets containing neodymium, iron, and boron. Background technique [0002] As a technique for improving the magnetic properties of a rare-earth permanent magnet containing neodymium (Nd), iron (Fe), and boron (B), there is a magnet in which Fe is substituted with cobalt (Co) (Patent Document 1). In Patent Document 1, regarding the coercive force Hc, residual magnetic flux density Br, and maximum energy product BH of a permanent magnet obtained by substituting other atoms for Fe, max etc. conducted comprehensive measurements, showing that the magnetic properties of the above-mentioned permanent magnets were improved. [0003] In addition, Patent Document 2 discloses a rare earth sintered magnet containing R (R is at least one kind of rare earth elements including Y, and Nd in R is 50 atomic % or more) by weight %: 25 to 35%, B: 0.8 to 1.5%, M (at least one selected from Ti, Cr, Ga, Mn, Co, Ni, C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/08B22F1/00B22F3/00C22C38/00H01F1/057H01F41/02
CPCB22F1/00B22F3/00C22C38/00H01F1/057H01F1/08H01F41/02C22C38/005C22C38/06C22C38/10C22C38/12C22C38/16C22C30/02C22C2202/02H01F1/0577H01F41/0293H01F41/0266B22F3/16B22F3/24B22F9/04B22F9/24B22F2003/248B22F2009/043B22F2202/05B22F2301/355
Inventor 伴野秀和江口春树米山夏树中野渡功长尾佳佑高桥宽郎
Owner IHI CORP