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Preparation method of high-coercivity manganese gallium magnetic powder

A high coercive force, permanent magnet powder technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems that it is difficult to obtain high magnetic energy product and magnetic anisotropy, and achieve short milling time and high Effects of remanence and high coercive force

Inactive Publication Date: 2018-01-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some insurmountable problems in the above methods: First, the powders developed by these methods are all nanocrystalline powders with micron-scale size, which cannot obtain magnetic anisotropy, and it is difficult to obtain high magnetic energy product

Method used

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  • Preparation method of high-coercivity manganese gallium magnetic powder
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  • Preparation method of high-coercivity manganese gallium magnetic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: prepare high coercive force Mn according to the following specific steps 3 Ga magnetic powder:

[0020] Step 1: After weighing 99% pure Mn and 99.5% pure Ga in proportion, obtain Mn under Ar atmosphere by using suspension smelting technology 3 Ga ingot;

[0021] Step two, the Mn obtained in step one 3 The Ga ingot was annealed at 500°C for 45 minutes in an Ar atmosphere to obtain a tetragonal alloy ingot;

[0022] Step 3: Remove the oxide scale from the annealed ingot obtained in Step 2 and then coarsely crush it. Use a ball mill voltage of 50V, the ball-to-material ratio is 18:1 by weight, and the balls used are made of stainless steel. Three kinds of Φ10mm, the ball milling medium is 120# aviation gasoline, and the ball milling time is 0.25h. Mn after ball milling 3 The microscopic strain and coercive force of Ga magnetic powder are 0.38 and 8.03kOe, respectively.

Embodiment 2

[0023] Embodiment 2: prepare high coercive force Mn according to the following specific steps 2.50 Ga magnetic powder:

[0024] Step 1: After weighing 99% pure Mn and 99.5% pure Ga in proportion, obtain Mn under Ar atmosphere by using suspension smelting technology 2.50 Ga ingot;

[0025] Step two, the Mn obtained in step one 2.50 The Ga ingot was annealed at 500°C for 1 day in an Ar atmosphere to obtain a tetragonal alloy ingot;

[0026] Step 3: Remove the oxide skin from the annealed ingot obtained in Step 2 and then coarsely crush it. Use a ball mill voltage of 50V, the ball-to-material ratio is 20:1 by weight, and the balls used are made of stainless steel. The ball size is Φ6mm, Φ8mm, Three kinds of Φ10mm, the ball milling medium is 120# aviation gasoline, the ball milling time is 1h, the Mn after ball milling 2.50 The microscopic strain and coercive force of Ga magnetic powder are 0.49 and 7.12kOe, respectively.

Embodiment 3

[0027] Embodiment 3: prepare high coercive force Mn according to the following specific steps 1.80 Ga magnetic powder:

[0028] Step 1: After weighing 99% pure Mn and 99.9% pure Ga in proportion, obtain Mn by suspension melting technology under Ar atmosphere 1.80 Ga ingot;

[0029] Step two, the Mn obtained in step one 1.80 The Ga ingot was annealed at 610°C for 7 days in an Ar atmosphere to obtain a tetragonal alloy ingot;

[0030]Step 3: Remove the oxide skin from the annealed ingot obtained in Step 2 and then perform coarse crushing. Use a ball mill voltage of 50V, the ball-to-material ratio is 21:1 by weight, and the balls used are made of stainless steel. Three kinds of Φ10mm, the ball milling medium is 120# aviation gasoline, the ball milling time is 1.5h, the Mn after ball milling 1.80 The microscopic strain and coercive force of Ga magnetic powder are 0.51 and 6.23kOe, respectively.

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Abstract

The invention discloses a preparation method of high-coercivity manganese gallium magnetic powder, and belongs to the technical field of a magnetic material. The method for preparing the high-coercivity manganese gallium magnetic powder by a mode of introducing micro strain comprises the steps of obtaining a Mn<x>Ga alloy ingot through a suspension smelting technology firstly; performing annealingat a temperature of 400-650 DEG C for 1-10 days to obtain a tetragonal phase; performing rough crushing and sieving and then putting into a ball mill tank prepared from stainless steel; by adopting gasoline as a medium and by combination with a low-energy ball milling method, performing ball milling for 0-3.5h to obtain the high-coercivity manganese gallium magnetic powder, wherein the micro strain is 0.3-1.0 based on different ingredients and processing technologies. By virtue of rough smashing and by combination with the low-energy ball milling method, the manganese gallium magnetic powderis prepared, so that the problem of phase change caused by overhigh ball milling energy can be avoided; and meanwhile, a phenomenon of induced magnetic anisotropy and high coercivity induced by the stress is observed, so that a new means is provided for magnetic hardening of the manganese gallium permanent magnetic material.

Description

technical field [0001] The invention relates to a method for preparing high-coercivity manganese-gallium permanent magnet powder by introducing microscopic strain, and belongs to the technical field of magnetic materials. Background technique [0002] As an important branch of magnetic materials, permanent magnet materials have penetrated into various fields of people's lives in today's electronic age, making them play an increasingly important role. In recent years, due to the serious shortage of rare earth resources caused by the increase in the demand for rare earth resources, the price has risen sharply, so many scholars have put their research into magnetic materials of non-rare earth elements to replace expensive rare earth metals, hoping to obtain in practice. application. Mn-Ga alloy has gradually become a hot spot in the field of magnetic materials due to its rare earth-free, rich phase structure, and diverse intrinsic magnetism. Research reports on its preparatio...

Claims

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Application Information

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IPC IPC(8): H01F1/047B22F9/04
Inventor 路清梅王大军岳明张红国张东涛
Owner BEIJING UNIV OF TECH
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