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Manufacturing method for R-Fe-N permanent magnet material granules

A permanent magnetic material, r-fe-n technology, applied in the field of preparation of R-Fe-N permanent magnetic material particles, can solve the problems of difficult to remove, easy to decompose, difficult surfactants, etc., to expand the practical application field, Effect of suppressing the degree of amorphization and reducing the oxygen content

Inactive Publication Date: 2015-11-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is very difficult to prepare R-Fe-N permanent magnetic alloy particles by chemical reduction, and even if it can be prepared, its coercive force at room temperature is very small
Micron and nanoscale R-Fe-N permanent magnetic alloy particles can be successfully prepared by using surfactant-assisted ball milling method, but because R-Fe-N is a metastable compound, it is easy to decompose, and the surfactant-assisted ball milling method In the prepared particles, the yield of nano-sized particles is limited, and the coercive force of micron-sized particles is low
In addition, because the surface-active agent coated on the surface of the prepared nanoparticles is difficult to remove, the subsequent utilization is limited.

Method used

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  • Manufacturing method for R-Fe-N permanent magnet material granules
  • Manufacturing method for R-Fe-N permanent magnet material granules
  • Manufacturing method for R-Fe-N permanent magnet material granules

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Embodiment 1

[0038] In this embodiment, the raw materials used, the grinding balls and the ratio of the material to the ball are exactly the same as those of Comparative Example 1, the difference is that the present embodiment is different for Sm 2 Fe 17 N x Powder raw materials are subjected to low-temperature dry grinding treatment, the process is as follows:

[0039] (1) The above Sm 2 Fe 17 N x Put the powder raw material into a stainless steel ball mill tank, add stainless steel grinding balls with a diameter of 6.5 mm and 9.5 mm, and the ball-to-material ratio is 10:1. Seal the ball mill tank with raw materials and balls in a glove box, and the protective gas is high-purity Ar gas;

[0040] (2) Place the ball mill tank in liquid nitrogen for low temperature treatment, and take it out after the temperature of the ball mill tank is kept below -150°C;

[0041] (3) Install the ball mill jar on the ball mill and ball mill for 3 minutes under normal temperature environment;

[0042]...

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Abstract

The invention provides a manufacturing method for R-Fe-N permanent magnet material granules. The method comprises the steps that powdery R-Fe-N permanent magnet materials are used as raw materials, low-temperature dry method ball-milling treatment is performed on the powdery R-Fe-N permanent magnet materials, and the ball-milling temperature ranges from 0 to 196 DEG C; and the R-Fe-N permanent magnet material granules are obtained. Compared with an existing ball-milling method, decomposition of raw materials in the ball-milling process is reduced, decrystallization of the raw materials is restrained, the granules are better refined, the ball-milling efficiency is improved, meanwhile, the oxygen content is decreased, and the R-Fe-N permanent magnet material granules with the higher performance are obtained.

Description

technical field [0001] The invention relates to the technical field of magnetic material preparation, in particular to a method for preparing R-Fe-N permanent magnetic material particles. Background technique [0002] R-Fe-N permanent magnet alloy particles have an important research and application background in the preparation of a new generation of nano-two-phase composite permanent magnet materials, bonded or sintered magnets, ultra-high-density magnetic recording materials, and ferrofluids. [0003] At present, the methods for preparing R-Fe-N permanent magnetic alloy particles include chemical reduction method, mechanical alloying method, surfactant-assisted ball milling, powder metallurgy and so on. However, it is very difficult to prepare R-Fe-N permanent magnetic alloy particles by chemical reduction, and even if it can be prepared, its coercive force at room temperature is very small. Micron and nanoscale R-Fe-N permanent magnetic alloy particles can be successful...

Claims

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Application Information

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IPC IPC(8): B22F9/04
Inventor 方秋丽张健张松林杜娟夏卫星闫阿儒刘平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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