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R-T-B-based sintered magnet

A technology of R-T-B and sintered magnets, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc. It can solve the problems of limited output, expensive, unstable supply, etc. The effect of coercivity

Active Publication Date: 2019-10-01
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, heavy rare earth elements as resources tend to be in specific regions, and their output is limited
Therefore, heavy rare earth elements are more expensive than light rare earth elements, and their supply is unstable

Method used

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  • R-T-B-based sintered magnet
  • R-T-B-based sintered magnet
  • R-T-B-based sintered magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0138] [Production of sintered magnet] A raw material alloy was produced from a raw material metal of a sintered magnet by a strip continuous casting method. According to the weighing of the raw material metal, the composition of the raw material alloy is adjusted. The content of each element in the raw material alloy was adjusted to the following values.

[0139] The Nd content was 24.96% by mass. The content of Pr was 6.24% by mass. The content of B was 0.86% by mass. The content of Co was 2.00% by mass. The content of Cu was 0.50% by mass. The Ga content was 1.00% by mass. The Al content was 0.20% by mass. The content of Zr was 0.20% by mass. The remainder after removing the above-mentioned elements from the raw material alloy is Fe and a very small amount of unavoidable impurities (Tb, etc.). The respective contents of Nd, Pr, Fe, Co, Ga, Al, Cu, and Zr were measured by fluorescent X-ray analysis. The B content was measured by ICP emission analysis. The O content...

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Abstract

An R-T-B-based sintered magnet includes a rare earth element R (such as Nd and Pr), a transition metal element T (such as Fe and Co), B, Cu, and Ga. The R-T-B-based sintered magnet includes a plurality of main phase grains (a crystal of R2T14B) and a plurality of grain boundary multiple junctions surrounded by at least three main phase grains, the plurality of grain boundary multiple junctions areclassified into a transition metal rich phase (such as R6T13Ga) and an R-rich phase, the R-rich phase is classified into a Cu-poor phase and a Cu-rich phase. The cross section of the sintered magnetsatisfies the following Formulas 1 and 2. N1 is the number of transition metal rich phases. N2 is the number of Cu-poor phases. N3 is the number of Cu-rich phases. 0.30<=N1 / (N1+N2+N3)<=0.60......(1).0.03<=N3 / N2<=0.20......(2).

Description

technical field [0001] The invention relates to an R-T-B system sintered magnet containing at least a rare earth element (R), a transition metal element (T) and boron (B). Background technique [0002] R-T-B based sintered magnets have excellent magnetic properties, and therefore are used in engines and actuators mounted in hybrid vehicles, electric vehicles, electronic equipment, home appliances, and the like. R-T-B based sintered magnets used in engines and the like are required to have high coercive force even under high temperature environments. [0003] As a method of increasing the coercive force (HcJ) at high temperature of R-T-B system sintered magnets, it is known to substitute heavy rare earth elements such as Dy or Tb to form R 2 T 14 Part of the light rare earth elements (Nd or Pr) of the B phase, which increases the R 2 T 14 Magnetic anisotropy of phase B. In recent years, the demand for high-coercivity type R-T-B-based sintered magnets that require a large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057
CPCH01F1/0577C22C38/002C22C38/005C22C38/06C22C38/10C22C38/14C22C38/16H01F41/0293Y02T10/64C22C2202/02
Inventor 工藤光三轮将史
Owner TDK CORPARATION