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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Problems solved by technology

However, there are some insurmountable problems in the above methods: First, the powders developed by these methods are all nanocrystal...

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.

Application Domain

Magnetic materials

Technology Topic

Magnetic powderCoercivity +11

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Experimental program(6)
Effect test(1)

Example Embodiment

[0019] Example 1: Preparation of high coercivity 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, Mn is obtained by suspension smelting and melting technology in an Ar atmosphere 3 Ga ingot;

[0021] Step 2, the Mn obtained in step 1 3 The Ga ingot was annealed at 500°C for 45min in an Ar atmosphere to obtain a tetragonal alloy ingot;

[0022] In step 3, the annealed ingot obtained in step 2 is subjected to rough crushing after removing the oxide scale, using a ball-milling voltage of 50V, the ball-to-material ratio is 18:1 by weight, the sphere used is made of stainless steel, and the size of the sphere is Φ6mm, Φ8mm, There are three types 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 coercivity of the Ga magnetic powder are 0.38 and 8.03 kOe, respectively.

Example Embodiment

[0023] Example 2: Preparation of high coercivity 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, Mn is obtained by suspension smelting and melting technology in an Ar atmosphere 2.50 Ga ingot;

[0025] Step 2, the Mn obtained in step 1 2.50 The Ga ingot was annealed at 500 °C for 1 day in an Ar atmosphere to obtain a tetragonal alloy ingot;

[0026] In step 3, the annealed ingot obtained in step 2 is subjected to rough crushing after removing the oxide scale, using a ball milling voltage of 50V, the ratio of ball to material is 20:1 by weight, the sphere used is made of stainless steel, and the size of the sphere is Φ6mm, Φ8mm, Three kinds of Φ10mm, the ball milling medium is 120# aviation gasoline, the ball milling time is 1h, and the Mn after ball milling 2.50 The microscopic strain and coercivity of the Ga magnetic powder are 0.49 and 7.12kOe, respectively.

Example Embodiment

[0027] Example 3: Preparation of high coercivity 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, Mn is obtained by suspension smelting and melting technology in an Ar atmosphere 1.80 Ga ingot;

[0029] Step 2, the Mn obtained in step 1 1.80 The Ga ingot was annealed at 610 °C for 7 days in an Ar atmosphere to obtain a tetragonal alloy ingot;

[0030]In step 3, the annealed ingot obtained in step 2 is subjected to rough crushing after removing the oxide scale, using a ball-milling voltage of 50V, the ball-to-material ratio is 21:1 by weight, the adopted sphere is made of stainless steel, and the size of the sphere is selected from Φ6mm, Φ8mm, Three kinds of Φ10mm, the ball milling medium is 120# aviation gasoline, the ball milling time is 1.5h, and the Mn after ball milling 1.80 The microscopic strain and coercivity of the Ga magnetic powder are 0.51 and 6.23 kOe, respectively.

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Classification and recommendation of technical efficacy words

Improve coercive force

Preparation method of high-coercivity manganese gallium magnetic powder

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Problems solved by technology

Abstract

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Description & Claims & Application Information

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