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Method for preparing N40M type sintered neodymium-iron-boron magnetic material by adding 38M waste

A neodymium-iron-boron, magnetic material technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of high production cost, economic loss, preparation of permanent magnet materials, etc., to reduce production cost and process cost. The effect of reducing, good magnetic properties

Inactive Publication Date: 2020-05-19
慈溪市兴发磁业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

N40M type permanent magnet material is an important magnetic material. Rare earth metal raw materials in the raw materials for preparing N40M type NdFeB magnetic materials are gradually consumed during use and cannot be regenerated. Therefore, with the increase of market demand, The remaining amount of rare earth metals is reduced, and the production cost becomes higher
[0006] In the process of preparing permanent magnet materials and permanent magnet materials, some waste materials often appear after hydrogen crushing and other processes, but they cannot be directly used in the preparation of permanent magnet materials, and are often discarded, resulting in greater economic losses.

Method used

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  • Method for preparing N40M type sintered neodymium-iron-boron magnetic material by adding 38M waste
  • Method for preparing N40M type sintered neodymium-iron-boron magnetic material by adding 38M waste
  • Method for preparing N40M type sintered neodymium-iron-boron magnetic material by adding 38M waste

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for preparing N40M type sintered NdFeB magnetic material by adding 38M waste material, comprising the following steps:

[0041] S1: prepare raw materials, the raw materials include 77% of 38M waste, 0.08% of antioxidants, 0.08% of gasoline and 22.84% of new mixed metal materials; wherein the mixed metal new materials are made of the following mass fractions of raw materials: praseodymium neodymium alloy 28.6%, praseodymium neodymium dysprosium alloy 3.57%, boron 4.94%, copper 0.16%, aluminum 0.51%, zirconium 0.16%, cobalt 0.45%, alloy iron 0.092%, iron is the balance; 38M scrap contains the following mass percentage of raw materials: Praseodymium neodymium alloy 28.5%, gadolinium iron 2%, boron 4.9%, copper 0.18%, aluminum 0.5%, zirconium 0.15%, cobalt 0.4%, cerium 2.5%, iron is the balance;

[0042] S2: smelting the above-mentioned raw materials under vacuum conditions, adjusting the speed of the copper roll to 45m / s, and the smelting temperature to 1350°C to ...

Embodiment 2

[0048] The difference between this example and Example 1 is: Step S1: prepare raw materials, the raw materials include 82% of 38M waste, 0.12% of antioxidants, 0.12% of gasoline and 17.76% of new mixed metal materials, wherein the mixed metal new materials It is made of raw materials with the following mass fractions: praseodymium neodymium alloy 32.6%, praseodymium neodymium-dysprosium alloy 4.17%, boron 5.54%, copper 0.22%, aluminum 1.11%, zirconium 0.22%, cobalt 0.51%, alloy iron 0.102%, iron is the remainder Quantity; 38M scrap is made of raw materials with the following mass fractions: praseodymium neodymium alloy 29.5%, gadolinium iron 2.5%, boron 5.6%, copper 0.23%, aluminum 0.8%, zirconium 0.2%, cobalt 0.5%, cerium 3.5%, iron 0.5% The remainder; the others are the same as in Example 1.

Embodiment 3

[0050] The difference between this embodiment and Embodiment 1 is:

[0051] Step S1: prepare raw materials, the raw materials include 80% of 38M waste, 0.1% of antioxidants, 0.1% of gasoline and 19.8% of new mixed metal materials, wherein the new mixed metal materials are made from the following mass fractions of raw materials:

[0052] Praseodymium neodymium alloy 30.6%, praseodymium neodymium-dysprosium alloy 3.87%, boron 5.24%, copper 0.19%, aluminum 0.81%, zirconium 0.19%, cobalt 0.48%, alloy iron 0.097%, iron is the balance;

[0053] 38M scrap is made of raw materials with the following mass fractions: praseodymium neodymium alloy 29%, gadolinium iron 2.3%, boron 5.3%, copper 0.21%, aluminum 0.65%, zirconium 0.18%, cobalt 0.45%, cerium 3%, iron is the balance ; Others are the same as in Example 1.

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Abstract

The invention discloses a method for preparing an N40M type sintered neodymium-iron-boron magnetic material by adding 38M waste. The preparation method comprises the following steps: S1, preparing 38Mwaste, an antioxidant and gasoline, the balance being a mixed metal new material; S2, smelting the mixed metal new material to obtain a strip alloy; S3, carrying out hydrogen decrepitation on the strip alloy to obtain coarse crushed powder, and crushing the coarse crushed powder, the 38M waste and the antioxidant by a jet mill to obtain magnetic micro powder; S4, pressing the magnetic micro powder into a blank; and S5, carrying out vacuum sintering on the blank under nitrogen protection. The magnetic material disclosed by the invention has the advantage of high magnetic performance; ad in addition, the preparation method disclosed by the invention has the advantage of preparing the N38M type sintered neodymium-iron-boron magnetic material at a low cost.

Description

technical field [0001] The invention relates to the technical field of magnetic materials and their production, more particularly, to a method for preparing N40M type sintered NdFeB magnetic materials by adding 38M waste material. Background technique [0002] As a representative of the third generation of rare earth permanent magnets, sintered Nd-Fe-B magnet is a multiphase material prepared by powder metallurgy method with excellent magnetic properties: theoretical energy product (BH) max Up to 512KJ / m 3 (64MGOe), saturation magnetic polarization J s About 1.6T, the magnetocrystalline anisotropy field H A About 7.3T, Curie temperature T c =312°C. Nd 2 F 14 The B phase is the main phase of the sintered Nd-F-B permanent magnet material, which determines the intrinsic magnetic properties of the magnet. But this is only the theoretical magnetic properties of the sintered Nd-Fe-B permanent magnet material; in the actual production process, due to the large magnetic energ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057H01F1/08
CPCH01F1/0576H01F1/0577H01F1/086H01F41/026H01F41/0266
Inventor 胡建贞胡建新胡泽君
Owner 慈溪市兴发磁业科技有限公司
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