A heavy rare earth high performance NdFeB permanent magnet and its manufacturing method

A technology without heavy rare earths and permanent magnets, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of high prices and decreased reserves of heavy rare earths, and achieve the effect of reducing consumption and material costs

Inactive Publication Date: 2018-10-09
INNER MONGOLIA BAOTOU STEEL RARE EARTH MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heavy rare earths such as Dy and Tb are expensive, and domestic reserves of heavy rare earths are also on a downward trend

Method used

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  • A heavy rare earth high performance NdFeB permanent magnet and its manufacturing method
  • A heavy rare earth high performance NdFeB permanent magnet and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Prepare raw materials:

[0058] (A) The main phase alloy, Pr:Nd is preferably 1:4, and its composition is shown in Table 1.

[0059] (B) The auxiliary phase metal is a PrNd alloy hydride.

[0060] 1) Preparation of the main phase alloy cast sheet: the raw materials in the main phase alloy are placed in a crucible in order according to the melting point, and after 20 minutes in the oven, vacuumize to below 3Pa, fill with argon to 30Mpa under pressure protection, and heat up to 1500°C for melting The alloy was cast for 10 minutes, and the temperature was lowered to 1400° C. to obtain a main phase alloy cast sheet with an average thickness of about 0.25 mm.

[0061] 2) Preparation of main phase alloy hydrogen crushing powder: the main phase alloy is crushed to a block shape smaller than 30mm*15mm. When hydrogen is crushed, hydrogen is fully absorbed. The alloy can be put into the hydrogen crushing furnace and heated to 250°C before feeding Hydrogen reaction. During dehydr...

Embodiment 2-3

[0072] Prepare permanent magnets according to the same method as in Example 1, wherein the auxiliary phase metals used are respectively Nd hydrides (in Example 2) and PrNd alloy hydrides (in Example 3), and the process parameters and results are listed in Table 1 .

[0073] Table 1

[0074]

[0075]

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PUM

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Abstract

The invention relates to a high-performance neodymium-iron-boron permanent magnet free of heavy rare earth and a manufacturing method of the high-performance neodymium-iron-boron permanent magnet free of the heavy rare earth. The permanent magnet is prepared from the raw materials including the following components: (A) a main-phase alloy and (B) an auxiliary-phase metal, wherein the main-phase alloy is prepared from the following components in percentage by weight: 29wt%-30wt% of Pr and Nd, 0.9wt%-1.0wt% of B, 0.05wt%-0.5wt% of Al, 0.05wt%-0.2wt% of Cu, 0.2wt%-0.5wt% of Nb, 0.1wt%-0.2wt% of Zr, 0.1wt%-2.0wt% of Co, 0.2wt%-0.5wt% of Ga and the balance of Fe; the auxiliary-phase metal is selected from an Nd hydride or a PrNd alloy hydride; the permanent magnet is a sintered neodymium-iron-boron permanent magnet with high remanent magnetism and high magnetic energy product, and has the advantages that Hcj of the magnet is improved and Br is not lowered basically; and the permanent magnet provided by the invention is domestic highest grade magnets, of N54, 52M, 45H and the like, free of the heavy rare earth. The material cost of a product is effectively reduced by reducing the consumption of the heavy rare earth.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, and mainly relates to a low-cost and high-performance NdFeB permanent magnet and a manufacturing method thereof. Background technique [0002] High-energy product magnets can realize miniaturization and light weight of devices, and are widely used in the fields of computers and communications. Heavy rare earths such as Dy and Tb can effectively improve the coercive force of sintered NdFeB permanent magnets. However, heavy rare earths such as Dy and Tb are expensive, and domestic reserves of heavy rare earths are also on a downward trend. Reducing the use of heavy rare earths to prepare high-performance NdFeB permanent magnets has become one of the key development directions in the future. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a heavy rare earth-free NdFeB permanent magnet and its man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/16C22C33/02
Inventor 苏满有王标董改华耿霄鹏郭毛毛常双全赵芬高娇李波张时茂宋晶晶乌云
Owner INNER MONGOLIA BAOTOU STEEL RARE EARTH MAGNETIC MATERIAL CO LTD
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