Unlock instant, AI-driven research and patent intelligence for your innovation.

Rare-earth magnet and method for manufacturing same

A technology of rare earth magnets and manufacturing methods, which is applied in the fields of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problem of not seeking isotropic magnet materials to give anisotropy strategies, and reduce material costs , Low material cost, and the effect of suppressing the decline in magnetic properties

Active Publication Date: 2016-04-20
TOYOTA JIDOSHA KK
View PDF6 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, Patent Document 1 does not describe at all a strategy for imparting anisotropy to this isotropic magnet material.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rare-earth magnet and method for manufacturing same
  • Rare-earth magnet and method for manufacturing same
  • Rare-earth magnet and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] By liquid quenching, the (Nd (1-x) Ce x ) y Fe 100-y-w-z-v co w B z Ga v The alloy with the composition (x=1, y=13.5, z=5.8, w=4, v=0.5) is nanocrystallized (a heat treatment may also be performed on the amorphous). Here, as conditions for performing rapid cooling, the temperature of the molten metal is 1450° C., an inert atmosphere (Ar depressurized atmosphere), and a peripheral speed of 20 to 40 m / s. The ribbon having this nanocrystalline structure is inserted into a mold, and pressurized and heated to produce a molded body. Here, as conditions for performing molding, the molding pressure is 200 MPa, the temperature is 650° C., and the holding time is 180 s. Thermoplastic processing (strong processing) is performed on this molded body to obtain an oriented nanocrystalline structure. Here, as conditions for performing strong processing, the processing temperature is 750° C., the deformation rate is 0.1 to 10 / s, and the processing method is upsetting. The rare ...

Embodiment 2

[0111] will Nd 70 Cu 30 A core-shell type magnet was obtained in the same manner as in Example 1, except that the amount of the contact alloy was set to 20 wt%. The measurement results of volume fraction and Nd concentration are shown below.

[0112] Overall composition: (Nd 0.31 Ce 0.69 ) 2 Fe 14 B

[0113] Core: Ce 2 Fe 14 B. 53.6%

[0114] Outline: (Nd 0.669 Ce 0.331 ) 2 Fe 14 B. 46.4%

[0115] Nd concentration in the outer shell: 66.9%

[0116] Overall Nd concentration: 31.0%

Embodiment 3

[0118] will Nd 70 Cu 30 A core-shell type magnet was obtained in the same manner as in Example 1, except that the amount of the contact alloy was set to 40 wt%. The measurement results of volume fraction and Nd concentration are shown below.

[0119] Overall composition: (Nd 0.337 Ce 0.663 ) 2 Fe 14 B

[0120] Core: Ce 2 Fe 14 B. 53.5%

[0121] Outline: (Nd 0.726 Ce 0.274 ) 2 Fe 14 B. 46.5%

[0122] Nd concentration in outer shell: 72.6%

[0123] Overall Nd concentration: 33.7%

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

Provided is a rare-earth magnet having excellent magnetic anisotropy and a reduced amount of Nd, etc., and a method for manufacturing said magnet. A rare-earth magnet provided with a crystal grain having the overall composition (R2<(1-x)>R1<x>)<y>Fe<100-y-w-z-v>Co<w>B<z>TM<v> (where R2 is at least one of Nd, Pr, Dy, and Tb; R1 is an alloy of at least one of Ce, La, Gd, Y, and Sc; TM is at least one of Ga, Al, Cu, Au, Ag, Zn, In, and Mn; 0<x<1, y=12 to 20, z=5.6 to 6.5, w=0 to 8, and v=0 to 2), the average grain size of the crystal grain being no greater than 1000 nm, the crystal grain being composed of a core and an outer shell around said core, the core having a composition richer in R1 than in R2, and the outer shell having a composition richer in R2 than in R1.

Description

technical field [0001] The present invention relates to a rare earth magnet and its manufacturing method. Background technique [0002] Rare-earth magnets using rare-earth elements are also called permanent magnets. They are used not only in hard disks and MRI motors, but also in driving motors for hybrid vehicles and electric vehicles. [0003] As indicators of the magnet performance of this rare earth magnet, residual magnetization (residual magnetic flux density) and coercive force can be mentioned, but for the increase in the calorific value caused by the miniaturization of the motor and the increase in the current density, the rare earth used The heat resistance requirements of magnets are further improved, and how to maintain the coercive force of magnets under high temperature use has become one of the important research topics in this technical field. Taking Nd-Fe-B magnets, which are one of the rare earth magnets commonly used in vehicle drive motors, as an example...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057B22F3/00B22F3/24C22C33/02C22C38/00H01F1/08H01F41/02B22F1/17
CPCC22C33/02C22C38/00H01F1/0572H01F1/0576B22F2003/145B22F2207/01B22F2998/10B22F2999/00C22C2202/04B22F3/14B22F5/00C22C38/002C22C38/005C22C38/10C22C2202/02B22F2009/048H01F41/0293B22F1/07B22F1/17B22F3/02B22F3/04B22F3/1035B22F2202/05B22F3/06B22F9/023B22F1/08B22F2301/45H01F1/0551H01F41/0266
Inventor 伊东正朗矢野正雄岸本秀史佐久间纪次庄司哲也真锅明
Owner TOYOTA JIDOSHA KK