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Preparation method of rare earth magnet

A technology of rare earth magnets and products, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve unknown problems

Active Publication Date: 2016-05-04
TOYOTA JIDOSHA KK +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is unknown whether the above effects are obtained in magnets composed of nano-sized grains

Method used

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  • Preparation method of rare earth magnet
  • Preparation method of rare earth magnet
  • Preparation method of rare earth magnet

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach 》

[0047]

[0048] A representative example of the composition of a rare earth magnet is represented by the following composition formula:

[0049] R 1 v Fe w co x B y m 1 z

[0050] R 1 : one or more rare earth elements including Y,

[0051] m 1 : at least one of Ga, Zn, Si, Al, Nb, Zr, Ni, Cu, Cr, Hf, Mo, P, C, Mg and V,

[0052] 13≤v≤20,

[0053] w=100-v-x-y-z,

[0054] 0≤x≤30,

[0055] 4≤y≤20,

[0056] 0≤z≤3.

[0057] Preferably, in the composition formula R 1 v Fe w co x B y m 1 z in, R 1 The amount v of (one or more rare earth elements including Y) is 13≦v≦17, and the amount y of B is 5≦y≦16.

[0058] Another representative example of the composition of the rare earth magnet is represented by the following composition formula, and consists of the main phase ((R 2 R 3 ) 2 (FeCo) 14 B) and grain boundary phase ((R 2 R 3 )(FeCo) 4 B 4 Phase and R 2 R 3 phase) composition:

[0059] R 2 a R 3 b Fe c co d B e m 2 f

[0060] R 2 : one o...

no. 2 approach 》

[0109]

[0110] The film with the rare earth magnet composition is deposited on the substrate by any type of method such as chemical vapor deposition (CVD) and physical vapor deposition (PVD). The thickness of the film may be 0.50 μm or more, 1.00 μm or more, 2.00 μm or more, or 3.00 μm or more. In addition, the thickness of the film may be 1000 μm or less, 100 μm or less, 50 μm or less, or 10 μm or less.

[0111]

[0112] After the film is deposited, heat treatment under pressure is applied, which is a characteristic feature of the present invention. To this end, the difference in the thermal expansion coefficients of the substrate and the film deposited thereon can be exploited.

[0113] The pressure applied to the film during the pressurized heat treatment may be 1 MPa or more, 5 MPa or more, 10 MPa or more, 50 MPa or more, or 100 MPa or more, and may be 300 MPa or less, 400 MPa or less, or 500 MPa or less. The pressure heat treatment time may be 1 minute or more, 3 m...

Embodiment

[0116] [Reference Example 1-4]

[0117] It was confirmed in Reference Examples 1-4 below that rare earth magnets with improved magnetic coercive force were obtained in the method of the present invention for producing rare earth magnets compared to conventional methods not involving heat treatment, even when heat treatment was not accompanied by the addition of The same is true when pressing.

[0118] [Reference Example 1]

[0119] The preparation composition is Nd 15 Fe 77 B 7 Ga 1 Nanocrystalline rare earth magnets and compositions containing Al and Cu, that is, Nd 15 Fe 77 B 6.8 Ga 0.5 Al 0.5 Cu 0.2 nanocrystalline rare earth magnets. The final structure is composed of the main phase: Nd 2 Fe 14 B 1 Phase and grain boundary phase: Nd-rich phase (Nd or Nd oxide) or Nd 1 Fe 4 B 4 Phase composition of nanocrystalline structure. Ga is enriched in the grain boundary phase to prevent movement of grain boundaries and suppress coarsening of crystal grains. Both A...

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Abstract

The method of the present invention prepares rare earth magnets represented by neodymium magnets (Nd2Fe14B) and neodymium magnet films applied in microsystems by using a heat treatment method capable of improving magnetic properties, especially magnetic coercive force. The method for preparing a rare earth magnet comprises: (a) quenching a molten metal having a rare earth magnet composition to form a quenched flake of a nanocrystalline structure; sintering the quenched flake; subjecting the obtained sintered body to an orientation treatment; and The heat treatment under pressure is applied at a temperature that enables diffusion or fluidization of the grain boundary phase and at the same time is low enough to prevent grain coarsening. (b) Depositing a thick film on a substrate, applying annealing under pressure to crystallize it at a temperature high enough to enable diffusion or fluidization of the grain boundary phase and at the same time low enough to prevent grain coarsening. Preferably, an element capable of lowering the temperature at which the grain boundary phase can be diffused or fluidized is added to the rare earth magnet composition.

Description

technical field [0001] The present invention relates to a preparation method of a rare-earth magnet, which is generally represented by neodymium magnets and neodymium magnet films applied to MEMS (micro-electromechanical systems). More specifically, the present invention relates to a method of preparing a rare earth magnet having a structure composed of nano-sized grains. Background technique [0002] Rare earth magnets, neodymium magnets (Nd 2 Fe 14 B) and neodymium magnet films are represented as very strong permanent magnets with high magnetic flux density for a variety of applications. To further increase the magnetic coercive force, the grain size is being reduced to the nanoscale (tens to hundreds of nm). [0003] In a typical sintered magnet (grain size: several μm or more), it is well known that heat treatment is applied after sintering to increase the magnetic coercive force. For example, it is confirmed in Patent Documents 1 and 2 that when aging heat treatment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F41/32
CPCH01F1/0577H01F10/126H01F41/0273H01F41/32C22C38/002C22C38/005C22C38/06C22C38/16B22F2003/248B22F2998/00B22F2998/10B22F2999/00C22C2202/02H01F1/0576B22F3/105B22F1/07B22F1/068B22F9/08B22F3/10B22F3/24H01F1/01H01F41/00H01F41/005
Inventor 佐久间纪次岸本秀史加藤晃庄司哲也多米尼克·吉沃尔诺拉·登普西托马斯·格奥尔格·伍德科克奥利弗·古特弗莱施吉诺·赫尔卡克托马斯·施雷弗
Owner TOYOTA JIDOSHA KK
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