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Method for preparing N38M type sintered neodymium-iron-boron magnetic material at low cost

A NdFeB magnetic material technology is applied in the field of low-cost preparation of N38M sintered NdFeB magnetic materials, which can solve the problems of high production cost, non-renewable, economic loss, etc. The effect of magnetic properties

Inactive Publication Date: 2020-05-22
慈溪市兴发磁业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

N38M type permanent magnet material is an important magnetic material. Rare earth metal raw materials in the raw materials for preparing N38M type NdFeB magnetic material 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 N38M permanent magnet materials, and are often discarded, resulting in greater economic costs. loss

Method used

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  • Method for preparing N38M type sintered neodymium-iron-boron magnetic material at low cost

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A low-cost method for preparing N38M type sintered NdFeB magnetic material, comprising the following steps:

[0039] S1: Prepare raw materials, which include 78% by mass of 38M waste, 0.08% of antioxidants, 0.08% of gasoline, and 21.84% of mixed metal virgin materials, wherein the mixed metal virgin materials are made of the following mass fractions of raw materials: praseodymium neodymium alloy 27%, metal cerium 2.5%, gadolinium iron alloy 1.74%, boron 4.74%, copper 0.16%, aluminum 0.53%, zirconium 0.16%, cobalt 0.41%, alloy iron 0.092%, iron is the balance; of which 38M waste It contains the following raw materials in parts by weight: 28.5% of praseodymium-neodymium alloy, 2% of gadolinium iron, 4.9% of boron, 0.18% of copper, 0.5% of aluminum, 0.15% of zirconium, 0.4% of cobalt, 2.5% of metal cerium, and the balance of iron.

[0040] S2: Melting the above-mentioned raw materials under vacuum conditions, adjusting the rotation speed of the copper roll to 45m / s, and th...

Embodiment 2

[0046] The difference between this embodiment and Example 1 is: Step S1: Prepare raw materials, the raw materials include 82% 38M waste, 0.12% antioxidant, 0.12% gasoline and 17.76% mixed metal virgin materials, wherein the mixed Metal virgin materials are made of raw materials with the following mass fractions:

[0047] praseodymium neodymium alloy 31%, praseodymium neodymium dysprosium alloy 3.3%, gadolinium iron alloy 2.14%, boron 5.74%, copper 0.22%, aluminum 0.93%, zirconium 0.22%, cobalt 0.55%, alloy iron 0.1%, iron as the balance; 38M scrap It contains the following raw materials in parts by weight: 29.5% of praseodymium neodymium alloy, 2.5% of gadolinium iron, 5.6% of boron, 0.23% of copper, 0.8% of aluminum, 0.2% of zirconium, 0.5% of cobalt, 3.5% of metal cerium, and the balance of iron.

[0048] Others are with embodiment 1.

Embodiment 3

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

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

[0052] 29% praseodymium neodymium alloy, 2.9% praseodymium neodymium dysprosium alloy, 1.94% gadolinium iron alloy, 5.2% boron, 0.19% copper, 0.73% aluminum, 0.19% zirconium, 0.48% cobalt, 0.096% alloy iron, iron as the balance;

[0053] The 38M scrap contains the following raw materials in parts by weight: praseodymium neodymium alloy 29%, gadolinium iron 2.3%, boron 5.3%, copper 0.2%, aluminum 0.65%, zirconium 0.18%, cobalt 0.45%, metal cerium 3%, iron as the balance .

[0054] Others are with embodiment 1.

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Abstract

The invention discloses a method for preparing an N38M type sintered neodymium-iron-boron magnetic material at low cost. The method comprises the following specific steps: S1, preparing 78-82% by massof 38M waste, 0.08-0.12% by mass of an antioxidant, 0.08-0.12% by mass of gasoline and the balance of a mixed metal new material; S2, smelting the mixed metal new material to obtain a strip alloy; S3, enabling the strip alloy to be subjected to hydrogen decrepitation treatment, obtaining coarse crushing powder, crushing the coarse crushed powder and the 38M waste material by an airflow mill to obtain magnetic micro-powder; S4, pressing the magnetic micro powder into a blank; and S5, enabling the blank to be subjected to vacuum sintering under nitrogen protection. The magnetic material disclosed by the invention has the advantage of the high magnetic performance; in addition, the preparation method disclosed by the invention has the advantage of preparing the N38M type sintered neodymium-iron-boron magnetic material at low cost.

Description

technical field [0001] The invention relates to the technical field of magnetic materials and their production, more specifically, it relates to a low-cost method for preparing N38M type sintered NdFeB magnetic materials. Background technique [0002] As a representative of the third-generation rare earth permanent magnet, sintered Nd-Fe-B magnet is a multi-phase material prepared by powder metallurgy method, which has 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 Phase B is the main phase of 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 sintered Nd-Fe-B permanent magnet materials; in the actual production process, due to the large loss of magnetic energy in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057C22C33/02B22F9/02B22F9/04
CPCB22F9/023B22F9/04B22F2009/042B22F2998/10C22C33/0207H01F1/0577H01F41/0253H01F41/0266B22F2009/044B22F3/02B22F3/04B22F3/1007
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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