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Method for manufacturing sintered Nd-Fe-B magnet on basis of vapor deposition heat treatment for fine powder

A production method and technology of sintered magnets, which are applied in the field of magnet manufacturing, can solve the problems of long time for diffusion, bad scratches of magnet materials, high cost of fixture consumption, etc.

Active Publication Date: 2013-04-17
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 2. Diffusion takes a long time
[0013] 3. There are bad scratches on the surface of the magnet material, and the consumption cost of the fixture is also very high

Method used

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  • Method for manufacturing sintered Nd-Fe-B magnet on basis of vapor deposition heat treatment for fine powder
  • Method for manufacturing sintered Nd-Fe-B magnet on basis of vapor deposition heat treatment for fine powder
  • Method for manufacturing sintered Nd-Fe-B magnet on basis of vapor deposition heat treatment for fine powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] In the raw material preparation process: prepare Nd, Pr, Dy, Tb, Gd with a purity of 99.5%, Fe-B for industrial use, pure Fe for industrial use, Co with a purity of 99.99%, Cu, Mn, Al, Ag, Mo with a purity of 99.5% , C.

[0065] In terms of atomic percentage at%, according to the composition is R e T f A g J h G i D. k to prepare.

[0066] The content of each element is shown in the table below:

[0067]

[0068] In order to complete the above preparation composition, a total of 500kg of raw materials were weighed and prepared.

[0069] In the smelting process: take 500kg of the prepared raw material and put it into a crucible made of alumina, and carry out vacuum melting at a temperature below 1500°C in a vacuum below 10Pa in a high-frequency vacuum induction melting furnace.

[0070] In the casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 30,000 Pa, and then cast into slabs with an average ...

Embodiment 2

[0099] In the raw material preparation process: prepare Nd and Lu with a purity of 99.9%, Fe-B, Fe-P, Fe-Cr for industrial use, pure Fe for industrial use, Ru, Cu, Mn, Ga with a purity of 99.9%, Zr with a purity of 99.5% .

[0100] In terms of atomic percentage at%, according to the composition is R e T f A g J h G i D. k to prepare.

[0101] The content of each element is shown in the table below:

[0102]

[0103] In order to complete the above preparation composition, a total of 100kg of raw materials were weighed and prepared.

[0104] In the smelting process: take 100kg of prepared raw materials and put them into a crucible made of magnesium oxide, and put them in a high-frequency vacuum induction melting furnace at 10 -2 Vacuum melting is performed at a temperature below 1650°C in a vacuum below Pa.

[0105] In the casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 20,000 Pa, and then cast into...

Embodiment 3

[0134] In the raw material preparation process: La, Ce, Nd, Ho, Er with a purity of 99.5%, Fe-B for industrial use, pure Fe for industrial use, Ru with a purity of 99.99%, P, Si, Cr, Bi, Sn with a purity of 99.5% , Ta.

[0135] In terms of atomic percentage at%, according to the composition is R e T f A g J h G i D. k to prepare;

[0136] The content of each element is as follows:

[0137] In the R component, La is 0.1, Ce is 0.1, Nd is 12.5, Ho is 0.2, and Er is 0.2;

[0138] In the T component, Fe is 78.79, and Ru is 1;

[0139] In component A, P is 0.05, and B is 6.5;

[0140] In J component, Si is 0.01, Cr is 0.15;

[0141] In the G component, Bi is 0.1 and Sn is 0.1;

[0142] In component D, Ta is 0.5.

[0143] In order to complete the above preparation composition, a total of 500kg of raw materials were weighed and prepared.

[0144] In the smelting process: take 500kg of the prepared raw material and put it into an alumina crucible, and carry out vacuum mel...

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Abstract

The invention discloses a method for manufacturing a sintered Nd-Fe-B magnet on the basis of vapor deposition heat treatment for fine powder. The method includes a working procedure for manufacturing and sintering the sintered Nd-Fe-B magnet with the oxygen content lower than 2500ppm. The working procedure includes smelting neodymium, iron and boron to obtain alloy, coarsely grinding the alloy, then manufacturing the coarsely ground alloy into the fine powder by means of micro-grinding, and performing vapor deposition treatment for the fine powder obtained by means of micro-grinding and evaporation materials at the temperature of 100-1000 DEG C for a period longer than 1 minute and shorter than 24 hours; and forming a magnet by a magnetic field forming process, and sintering the magnet in a vacuum or inert-gas environment at the temperature of 900-1140 DEG C. The method has the advantages that the sinter characteristic of the powder is changed dramatically owing to an additional vapor heat treatment procedure for the fine powder, and the purpose of manufacturing the magnet with high coercive force, rectangularity and heat resistance is achieved.

Description

technical field [0001] The invention relates to the technical field of magnet manufacture, in particular to a method for manufacturing a sintered Nd-Fe-B system (neodymium-iron-boron) magnet based on fine powder vapor deposition heat treatment. Background technique [0002] A magnet is an object that can generate a magnetic field. It is a magnetic dipole that can attract ferromagnetic substances such as iron, nickel, cobalt and other metals. Nd-Fe-B series (neodymium-iron-boron) magnet is a kind of magnet. It is the magnet with the highest commercial performance found at present. It is known as the king of magnetism. It has extremely high magnetic properties and its maximum magnetic energy product ( BH)max is more than 10 times higher than ferrite (Ferrite); its own machining performance is also quite good, the working temperature can reach up to 200 degrees Celsius, and its texture is hard, stable performance, and good cost performance, so its The application is extremely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F3/16
CPCH01F1/0572H01F1/0577B22F9/12C22C33/02C22C33/0278B22F2998/10B22F2999/00C22C38/001C22C38/14C22C38/16C22C38/10C22C38/06C22C38/04C22C38/005C22C38/002C22C38/12B22F9/023B22F9/04B22F3/02B22F3/04B22F3/101B22F2003/248B22F2003/247B22F2201/20B22F2201/11B22F2202/05B22F1/054B22F2009/044H01F41/0293C22C38/007C22C38/004C22C1/04H01F1/0557H01F1/057
Inventor 永田浩吴冲浒
Owner FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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