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Preparation method of iron-based low-rare earth NdFeB rapid quenching permanent magnetic powder

A technology of permanent magnetic powder and rare earth, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of high production cost, achieve the effect of improving economic benefits and saving mineral resources

Active Publication Date: 2013-05-22
JIANGSU JUXIN MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, no matter whether it is the isotropic induction permanent magnet powder produced by foreign companies or the isotropic arc-type quick-quenching permanent magnet powder produced by many domestic manufacturers, the content of rare earth metal neodymium or praseodymium neodymium alloy is 20%. ~28%, accounting for about 70% of the total product cost, high production cost

Method used

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  • Preparation method of iron-based low-rare earth NdFeB rapid quenching permanent magnetic powder
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  • Preparation method of iron-based low-rare earth NdFeB rapid quenching permanent magnetic powder

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Embodiment 1

[0022] A method for preparing iron-based low-rare earth NdFeB quick-quenching permanent magnet powder, which sequentially includes a batching process, a vacuum smelting process, a vacuum quick-quenching process, an initial pressing process, a crystallization heat treatment process, a powder making process, and a magnetic property and fluidity testing process.

[0023] (1) In the batching process, the mass percentage of raw materials is: 15.5% praseodymium neodymium alloy, 7% lanthanum cerium alloy, 4.5% zirconium, 1.15% boron, and the rest is iron to form a batching.

[0024] (2) In the vacuum smelting process, put the ingredients into a vacuum induction furnace, under the protection of argon, the argon pressure is 0.04Pa; during the smelting process, the temperature rises to 1650°C, until all the materials are melted , and fully boil for 3 to 5 minutes to appear reddish, forming alloy liquid, and start casting. After casting, cool for 20 minutes to form a master alloy.

[002...

Embodiment 2

[0035] A method for preparing iron-based low-rare earth NdFeB quick-quenching permanent magnet powder, which sequentially includes a batching process, a vacuum smelting process, a vacuum quick-quenching process, an initial pressing process, a crystallization heat treatment process, a powder making process, and a magnetic property and fluidity testing process.

[0036] (1) In the batching process, the formula mass percentage of raw materials is: 19% praseodymium neodymium alloy, 3% lanthanum cerium alloy, 5.5% zirconium, 1.25% boron, and the rest is iron to form a batching.

[0037] (2) In the vacuum smelting process, put the ingredients into a vacuum induction furnace, under the protection of argon, the argon pressure is 0.05Pa; during the smelting process, the temperature rises to 1650°C, until all the materials are melted , and fully boiled for 3 to 5 minutes to appear reddish, forming alloy liquid, and started casting. After casting, cooled for 40 minutes to form a master al...

Embodiment 3

[0048] A method for preparing iron-based low-rare earth NdFeB quick-quenching permanent magnet powder, which sequentially includes a batching process, a vacuum smelting process, a vacuum quick-quenching process, an initial pressing process, a crystallization heat treatment process, a powder making process, and a magnetic property and physical property testing process.

[0049] (1) In the batching process, the formula mass percentage of raw materials is: 17% praseodymium neodymium alloy, 5% lanthanum cerium alloy, 5% zirconium, 1.2% boron, and the rest is iron to form a batching.

[0050] (2) In the vacuum smelting process, put the ingredients into a vacuum induction furnace, under the protection of argon, the pressure of argon is 0.045Pa; during the smelting process, the temperature rises to 1650°C, until all the materials are melted , and fully boil for 3-5 minutes to appear reddish, forming alloy liquid, and start casting. After casting, cool for 30 minutes to form a master a...

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Abstract

The invention provides a preparation method of iron-based low-rare earth NdFeB rapid quenching permanent magnetic powder. The preparation method comprises the procedures of: raw material preparation, vacuum melting, vacuum rapid quenching, primary pressing, crystallization thermal treatment, powder preparation, and magnetic property and physical property detection, wherein in the raw material preparation procedure, the iron-based low-rare earth NdFeB rapid quenching permanent magnetic powder is prepared from the following raw materials in percentage by weight: 15.5-19% of praseodymium-neodymium alloy, 3-7% of lanthanum-cerium alloy, 4.5-5.5% of zirconium, 1.15-1.25% of boron, and the balance of iron, thereby forming prepared materials. The use amount of the praseodymium-neodymium alloy is reduced by 19%, the lanthanum-cerium alloy is properly added, the performance index can achieve Hcj9.592, (BH)m9.751 through proper magnetic separation, and the property of the magnetic powder can achieve 14.38MGO. By utilizing the preparation method, the best result of producing the iron-based low-rare earth NdFeB rapid quenching permanent magnetic powder through a vacuum rapid quenching manner can be realized, the economic benefits can be directly improved by about 15%, thereby striding a new pace for saving limited mineral resources.

Description

technical field [0001] The invention belongs to the technical field of magnetic composite materials, and in particular relates to a preparation method of iron-based low-rare-earth NdFeB quick-quenching permanent magnet powder. Background technique [0002] Bonded NdFeB magnets are widely used in aerospace, navigation, automobiles, small and medium-sized high-efficiency motors, office automation and many household appliances, and are constantly expanding. However, so far, no matter whether it is the isotropic induction permanent magnet powder produced by foreign companies or the isotropic arc-type quick-quenching permanent magnet powder produced by many domestic manufacturers, the content of rare earth metal neodymium or praseodymium neodymium alloy is 20%. ~28%, accounting for about 70% of the total product cost, the production cost is high. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the invention provides a method for preparing iron-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22D11/06B22F1/00H01F1/057
Inventor 曹江平
Owner JIANGSU JUXIN MAGNET
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