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Rare earth permanent magnet and manufacturing method thereof

A technology for permanent magnets and manufacturing methods, which can be used in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., and can solve problems such as thermal instability of crystal structures

Inactive Publication Date: 2019-09-03
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, RFe 12 There is a problem that the crystal structure is thermally unstable in the binary system

Method used

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  • Rare earth permanent magnet and manufacturing method thereof
  • Rare earth permanent magnet and manufacturing method thereof
  • Rare earth permanent magnet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Figure 4 The production steps of the production method of the rare earth permanent magnet of this embodiment are shown.

[0101] (Process A)

[0102] First, in order to obtain the composition of 4.2Y-3.5Sm-76.6Fe-15.7Co (at%) (chemical formula is Sm 0.45 Y 0.55 (Fe0.83 co 0.17 ) 12 ) represents the total weight 1kg of the raw material alloy, weighing Y (purity 99.9%), Sm (purity 99.9%), electrolytic iron (purity 99.9%) and electrolytic cobalt (purity 99.9%) respectively. Considering the evaporation of Y and Sm at high temperature, 63.5g of Y, 89.6g of Sm, 704.3g of Fe and 148.7g of Co were weighed, making the target composition 7.7Y-76.6Fe-15.7Co, Y more 3% by mass and Sm by 5% by mass. The weighed metals were mixed, put into an alumina crucible, and melted by high-frequency melting. Afterwards, the molten metal is spread over a water-cooled copper hearth and allowed to solidify to obtain an ingot of the alloy. The produced alloy ingot was analyzed by an ICP an...

Embodiment 2

[0119] Figure 5 The production steps of the production method of the rare earth permanent magnet of this embodiment are shown.

[0120] (Process G)

[0121] The Y-Sm-Fe-Co-based alloy produced in step A of Example 1 was used. For an ingot composed of 3.8Y-3.4Sm-77.5Fe-15.3Co, the overall composition is, for example, the chemical formula Sm 0.45 Y 0.55 (Fe 0.83 co 0.17 ) 11 Cu 0.2 In the case of , weigh and add 0.115g of metal lumps of Y, 0.104g of metal lumps of Sm, 0.015g of metal lumps of Co, and 0.167g of metal lumps of Cu, and put them into the bottom opening The quartz molten liquid discharge pipe. Introduce the quartz melt discharge pipe filled with 3.8Y-3.4Sm-77.5Fe-15.3Co ingot, Y metal block, Sm metal block, Co metal block and Cu metal block into a high-frequency induction heating type amorphous metal manufacturing furnace , the ingot and metal block were heated and melted by applying a high-frequency electric field in an Ar atmosphere of 75 kPa.

[0122] ...

Embodiment 3

[0135] The procedure of this embodiment and Figure 5 The steps of Example 2 shown are basically the same, and only the differences will be described in particular.

[0136] (Process G)

[0137] The Y-Sm-Fe-Co-based alloy produced in step A of Example 1 was used. For an ingot composed of 3.8Y-3.4Sm-77.5Fe-15.3Co, the overall composition is, for example, the chemical formula Sm 0.55 Y 0.55 (Fe 0.83 co 0.17 ) 11 Cu 0.4 In the case of , weigh and add 0.111g of metal lumps of Y, 0.294g of metal lumps of Sm, 0.015g of metal lumps of Co, and 0.327g of metal lumps of Cu, and put them into the bottom opening The quartz molten liquid is discharged into the pipe. Introduce the quartz melt discharge pipe filled with 3.8Y-3.4Sm-77.5Fe-15.3Co ingot, Y metal block, Sm metal block, Co metal block and Cu metal block into a high-frequency induction heating type amorphous metal manufacturing furnace , the ingot and the metal block were heated and melted by applying a high-frequency el...

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Abstract

When a non-equilibrium ThMn12-type intermetallic compound formed by rapid quenching is converted into a magnet, no low melting liquid phase is formed so that there is a problem in densification. In the present invention, a liquid phase with a melting point of about 820°C can be formed by adding a trace amount of Cu to a quaternary system comprising Sm-Y-Fe-Co as main components and thus densification can be promoted in the process of producing a bulk magnet.

Description

technical field [0001] The invention relates to a ferromagnetic alloy and a manufacturing method thereof. Background technique [0002] In recent years, the development of magnets with reduced content of rare earth elements has been sought. The rare earth elements in this specification refer to at least one element selected from scandium (Sc), yttrium (Y) and lanthanoid elements. Among them, lanthanides are a general term for 15 elements ranging from lanthanum to lutetium. [0003] ThMn having a body-centered tetragonal crystal is known as a ferromagnetic alloy containing a relatively small proportion of rare earth elements. 12 Type crystal structure of RFe 12 (R is at least one kind of rare earth elements). However, RFe 12 There is a problem that the crystal structure is not stable to heat in the binary system. Patent Document 1 shows that by selecting Y as R and using the super-quenching method, ThMn can be generated from the binary system of Y-Fe 12 type of inspira...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055B22D11/06B22F3/14B22F9/04C22C38/00H01F1/08H01F41/02
Inventor 铃木启幸
Owner HITACHI LTD