R-T-B-Ga-BASED MAGNET MATERIAL ALLOY AND METHOD FOR PRODUCING SAME

A r-t-b-ga, alloy technology, applied in the direction of magnetic materials, magnetic objects, metal processing equipment, etc., to achieve the effect of improving saturation magnetization, improving and stabilizing coercivity, and increasing residual magnetic flux density

Active Publication Date: 2014-10-22
SANTOKU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in Patent Document 8, there is no description regarding the influence of the microstructure caused by Ga on the coercive force in the alloy crystal structure.

Method used

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  • R-T-B-Ga-BASED MAGNET MATERIAL ALLOY AND METHOD FOR PRODUCING SAME

Examples

Experimental program
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Embodiment

[0099] In order to verify the effect of the raw material alloy for a magnet of the present invention and its manufacturing method, an R-T-B-Ga-based alloy was produced to investigate the crystal structure. In addition, a sintered magnet was obtained using the produced R-T-B-Ga-based alloy as a raw material, and the magnetic properties of the sintered magnet were confirmed.

[0100] 1. Test method

[0101] [Raw material alloys for magnets]

[0102] In this test, R-T-B-Ga-based alloy flakes were prepared through the procedures of Examples 1 and 2 of the present invention, Conventional Examples, and Comparative Examples 1 to 3 described below. Regardless of any step, the composition of the R-T-B-Ga alloy sheet contains Nd: 24.0%, Pr: 5.0%, Dy: 2.0%, B: 1.0%, Ga: 0.10%, and the rest is Fe and Impurities. The melting point of the R-T-B-Ga alloy flake with this composition is about 650°C.

[0103]In Example 1-A of the present invention, in a chamber with an Ar atmosphere of 300 ...

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Abstract

An R-T-B-Ga-based magnet material alloy (provided that R is at least one type of rare-earth element including Y, and T at least one type of transition element requiring Fe), wherein the alloy comprises a R2T14B phase (3) being the main phase and R-rich phases (1 and 2) in which R is concentrated, and by making the Ga content ratio (% by mass) of a non-crystal phase (1) within the R-rich phase higher than the Ga content ratio (% by mass) of a crystal phase (2) within the R-rich phase, the magnetic property of a rare-earth magnet used as a material is able to be improved and magnetic property variance is reduced. An average thickness of the R-T-B-Ga-based magnet material alloy no less than 0.1mm and no greater than 1.0mm is preferable in order to minimize formation of chill crystals and alpha-Fe crystallization.

Description

technical field [0001] The present invention relates to an alloy useful as a raw material for a rare earth magnet and a method for producing the same. More specifically, it relates to a raw material alloy for an R-T-B-Ga-based magnet capable of improving magnetic properties and reducing variations in magnetic properties in a rare earth magnet used as a raw material, and a method for producing the same. Background technique [0002] As alloys for rare earth magnets, there are R-T-B alloys excellent in magnetic properties. The strip casting method is often used in the manufacture of this R-T-B alloy. [0003] The production of the R-T-B alloy by the strip continuous casting method can be performed, for example, by the following steps. [0004] (a) The raw materials are put into a crucible and melted by heating to prepare an R-T-B alloy melt. [0005] (b) The melt is supplied through a tundish to the outer peripheral surface of a quench roll having a structure in which a ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C38/00H01F1/057B22F1/06B22F1/068
CPCB22F2003/248C22C38/002B22F3/24B22F1/0007C22C38/005H01F1/0571C22C33/0278C22C45/00C22C38/00B22F1/068B22F1/06B22F9/04B22F2201/10B22F2201/20B22F2301/355
Inventor 佐口明彦祢宜教之米村光治
Owner SANTOKU CORP
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