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Process-saving manufacturing method of sintered Nd-Fe-B series magnet

A production method and technology of sintered magnets, which are applied in the field of magnet production to achieve the effects of saving rare earth resources, simplifying the production process, and reducing production costs

Active Publication Date: 2013-03-06
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the powder oxidation cannot be avoided by the jet milling method, it will not be an era of reducing the oxygen content to a lower level in the future

Method used

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  • Process-saving manufacturing method of sintered Nd-Fe-B series magnet
  • Process-saving manufacturing method of sintered Nd-Fe-B series magnet
  • Process-saving manufacturing method of sintered Nd-Fe-B series magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In the raw material preparation process: prepare Nd with a purity of 99.5%, Fe-B for industrial use, pure Fe for industrial use, Co with a purity of 99.9%, Cu, Al, and Zr with a purity of 99.5%;

[0053] 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.

[0054] The content of each element is shown in the table below:

[0055]

[0056] In order to complete the above preparation composition, a total of 500kg of raw materials were weighed and prepared.

[0057] In the smelting process: take 100kg of prepared raw materials each time and put them into alumina crucibles, and heat them in a high-frequency vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0058] In the casting process: Introduce Ar gas into the melting furnace after vacuum melting, and use the following casting methods to cast in a vacuum of 50,000 Pa pressure;

[0059] ...

Embodiment 2

[0079] In the raw material preparation process: prepare Nd with a purity of 99.5%, Fe-B for industrial use, pure Fe for industrial use, Co with a purity of 99.9%, Mn, Ga, and Nb with a purity of 99.5%

[0080] 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.

[0081] The content of each element is shown in the table below:

[0082]

[0083] In order to complete the above preparation composition, a total of 100kg of raw materials were weighed and prepared.

[0084] In the smelting process: take 100kg of prepared raw materials each time and put them into alumina crucibles, and heat them in a high-frequency vacuum induction melting furnace at 10 -1 Vacuum melting is carried out at a temperature below 1600°C in a vacuum of Pa.

[0085] In the casting process: Ar gas is introduced into the smelting furnace after vacuum smelting, and cast to a thickness of 0.3mm on a water-cooled disc-shaped casting plate in a vacuum ...

Embodiment 3

[0109] In the process of raw material preparation: in terms of atomic percentage at%, according to the composition of R e T f A g J h G i D. k to prepare.

[0110] The content of each element is shown in the table below:

[0111]

[0112] Preparation was carried out according to the above five experiment numbers, and 100 kg of raw materials were weighed and prepared for each experiment number.

[0113] In the smelting process: take 100kg of prepared raw materials each time and put them into a crucible made of magnesium oxide, and put them in a high-frequency vacuum induction melting furnace at 10 -1 Vacuum melting is carried out at a temperature below 1700°C in a vacuum of Pa.

[0114] In the casting process: Ar gas is introduced into the smelting furnace after vacuum smelting, and cast to a thickness of 0.3mm on a water-cooled disc-shaped casting plate in a vacuum of 90,000 Pa.

[0115] In the hydrogen crushing process: the raw material flakes with an average thick...

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Abstract

The invention discloses a process-saving manufacturing method of a sintered Nd-Fe-B series magnet. In a process of manufacturing the Nd-Fe-B series sintered magnet with oxygen content being below 2,500 ppm in the sintered magnet, a lamellar alloy raw material obtained by processes before a hydrogen demolishment pulverization process and with average thickness of 0.1-0.5 mm is used in a hydrogen demolishment pulverization process; hydrogen demolishment pulverization of not more than 24 hours is kept under the hydrogen pressure being above 0.01 MPa and below 1 MPa; then air stream pulverization is not performed; forming is directly performed by using a magnetic field forming method; and sintering is performed at the temperature of 900-1,140 DEG C under vacuum or in inert gas. The method realizes that the air stream pulverization process can be omitted to fulfill the aims of effectively utilizing precious rare earth resources, simplifying processes and performing low-cost production, and in addition, an oxidation effect which cannot be avoided in the air stream pulverization method in any way can also be prevented, so that the process is substantially a non-oxidative process, and large-scale manufacturing of ultrahigh-performance magnet is made possible.

Description

technical field [0001] The invention relates to the technical field of magnet manufacture, in particular to a manufacturing method of a sintered Nd-Fe-B system (neodymium-iron-boron) magnet without steps. 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 wide. [0003] There are two manufactur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02C22C38/00C22C33/02
CPCH01F1/0577B22F2999/00C22C2202/02C22C38/002C22C38/005C22C38/007C22C38/02C22C38/04C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16H01F1/0573B22F2009/045B22F2201/013B22F3/04B22F3/12B22F9/04C21D3/06C21D6/007C22C1/06C22C33/00H01F1/0536H01F1/0557H01F1/086H01F41/0266
Inventor 永田浩吴冲浒
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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