Neodymium iron boron permanent magnet material and preparation method thereof

A permanent magnet material, NdFeB technology, used in magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of difficulty in obtaining high Curie temperature and high coercivity, complex process, and grain boundary phase alloy content. Difficult to control and other problems, to achieve the effect of improved microstructure, easy control of content, time-consuming and cost-consuming

Active Publication Date: 2011-11-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention solves the complex process of preparing NdFeB permanent magnet materials by the double alloy method in the prior art, the difficulty in controlling the content of the grain boundary phase alloy, and the difficulty in obtaining high Curie temperature and high Curie temperature and High coercivity technical issues

Method used

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preparation example Construction

[0042] The preparation method of the NdFeB permanent magnet material provided by the present invention is a single alloy method for making NdFeB permanent magnet materials, similar to the existing single alloy method for making NdFeB permanent magnet materials, comprising the following steps: making NdFeB permanent magnet materials The alloy is crushed, powdered, added with additives, magnetically oriented and pressed, sintered and tempered under the conditions of vacuum or inert gas protection, and the above-mentioned NdFeB permanent magnet material is obtained. The main improvements are as follows: After the NdFeB alloy powder is made, the NdFeB alloy powder is evenly mixed with nano-silicon carbide, and then the magnetic field orientation is pressed and formed. The other steps are conventional process steps, and the specific details are as follows:

[0043] Step 1. Material preparation: Melt the NdFeB alloy according to its components, and use the casting process to make NdF...

Embodiment 1

[0062] The preparation method of the NdFeB permanent magnet material provided by embodiment 1 comprises the following steps:

[0063] 1. Melting: The NdFeB alloy is smelted according to the following composition Nd27.5Dy5Fe63.68Co2B0.92Ga0.3Al0.4Zr0.2, and the NdFeB alloy ingot is made by casting process, and then, under the protection of inert gas , heat treatment at a temperature of 1050°C for 8h, and coarse crushing.

[0064] 2. Hydrogen crushing: absorb hydrogen for 2.5 hours in a hydrogen crushing furnace with a hydrogen pressure of 1.0Mpa, and then dehydrogenate at a temperature of 580°C for 6 hours to prepare the required hydrogen crushing powder.

[0065] 3. Jet mill: add 0.03wt% antioxidant to the crushed hydrogen powder, mix evenly, and make a fine powder with an average particle size of 3.2um by jet mill;

[0066] 4. Mixing: add 0.2wt% nano-silicon carbide with an average particle size of about 40nm to the fine powder, then add 0.03wt% oleic acid, and mix thoroughl...

Embodiment 2

[0072] 1. Melting: The NdFeB alloy is smelted according to the following composition Nd27Tb2Dy3Fe64.14Co2B0.96Ga0.3Cu0.2Al0.2Zr0.2, and the NdFeB alloy quick-setting sheet is made by using the quick-setting thin strip process, in which the copper roller The surface linear velocity is 1.8m / s;

[0073] 2. Hydrogen crushing: absorb hydrogen for 2.5 hours under a hydrogen pressure of 1.0Mpa, and then dehydrogenate at a temperature of 580°C for 6 hours to prepare the required hydrogen crushing powder;

[0074] 3. Jet mill: add 0.03wt% antioxidant to the crushed hydrogen powder, mix evenly, and make a fine powder with an average particle size of 2.8um by jet mill;

[0075] 4. Mixing: Add 0.4wt% silicon carbide with an average particle size of about 40nm to the fine powder, then add 0.03wt% stearic acid, and mix well to obtain a mixed powder;

[0076] 5. Molding: The mixed powder is pressed into an orientation field with a magnetic field size of about 2.1T, and isostatically pressed...

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Abstract

The invention relates to a neodymium iron boron permanent magnet material and a preparation method thereof. The neodymium iron boron permanent magnet material provided by the invention consists of a neodymium iron boron alloy and an additive, wherein the additive is nanometer silicon carbide; and the content of the nanometer silicon carbide is 0.02 to 3 weight percent of the content of the neodymium iron boron alloy. The invention also provides a preparation method of the neodymium iron boron permanent magnet material. The method comprises the following steps of: crushing the neodymium iron boron alloy into powder; adding the additive; carrying out magnetic-field orientation compression molding; and sintering and tempering under the protection of vacuum or inert gas. By the preparation method of the neodymium iron boron permanent magnet material, the operating temperature and the coercive force of the neodymium iron boron permanent magnet material can be improved at the same time.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a neodymium-iron-boron permanent magnet material and a preparation method thereof. Background technique [0002] In 1983, Japan's Sumitomo Metal Corporation invented NdFeB permanent magnet materials. Since its inception, NdFeB permanent magnet materials have been widely used in automobiles, computers, electronics, machinery, energy, medical equipment and other fields due to their advantages such as high magnetic energy product, relatively low price and sufficient resource reserves. [0003] At present, the industry often adopts the sintering method to produce NdFeB permanent magnet materials, such as the article "Influence of Key Process Parameters and Alloying Elements on the Magnetic and Mechanical Properties of Sintered NdFeB" (Wang Wei, Master's Thesis of Zhejiang University, March 2005) Disclosed is a process flow for manufacturing NdFeB permanent magnet materials by a sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057B22F9/04B22F3/16
CPCH01F1/0577B22F2003/1032B22F2998/10B22F2999/00C22C38/00H01F41/0273B22F9/04C22C1/1084B22F3/087B22F3/10B22F2003/248B22F2009/042B22F9/023
Inventor 宫清廖超杜鑫丁大勇
Owner BYD CO LTD
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