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Rare earth permanent magnet alloy material and preparation process thereof

A technology of alloy materials and rare earth permanent magnets, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of low rare earth usage, high working temperature, high price, etc., to improve coercive force and high temperature resistance characteristics, the effect of improving competitiveness

Active Publication Date: 2012-07-25
ORIENT MAGNET TECH OMT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of heavy rare earth elements such as Tb and Dy, there is an urgent need for a method for producing NdFeB permanent magnet materials with high coercive force, high operating temperature, low heavy rare earth usage, and low cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select two alloys, S and T, where the chemical formula of S alloy is: R a Fe b B c M1 d , wherein R is a mixture of Pr, Nd and Gd three rare earth elements; R content a: 28.9wt%; Fe content b: 69.6wt%; B content c: 1.0wt%; M1 is Cu, content: 0.5 wt%;

[0026] The chemical formula of T alloy is: R x Fe y B z M2 u , wherein R is a mixture of three rare earth elements Nd, Tb and Dy; R content x: 35wt%; Fe content y: 64wt%; B content z: 0.5wt%; M2 is Cu and Al, content: 0.5 wt%;

[0027] The sum of the content percentages of the elements in the S alloy and the T alloy is 100%.

[0028] The preparation process is as follows:

[0029] 1) Batching: weighing and batching according to the respective composition ratios of S alloy and T alloy, as mentioned above, if necessary, physical methods can be used to remove oxides and impurities on the surface of raw materials;

[0030] 2) Alloy smelting: Melt the prepared two alloys in a vacuum induction melting furnace respect...

Embodiment 2

[0037] Select two alloys, S and T, where the chemical formula of S alloy is: R a Fe b B c M1 d , wherein R is a mixture of La, Ce, Nd, and Ho four rare earth elements; R content a: 32wt%; Fe content b: 62wt%; B content c: 1.2wt%; M1 is Co, Ga and A mixture of three elements of Mo, wherein; the content of Co: 3.6wt%, the contents of Ga and Mo are both: 0.6wt%;

[0038] The chemical formula of T alloy is: R x Fe y B z M2 u , wherein R is Pr, Nd and Dy three rare earth elements; R content x: 65wt%; Fe content y: 34wt%; B content z: 0.5wt%; M2 is Zr, content: 0.5wt% ;

[0039] The sum of the content percentages of the elements in the S alloy and the T alloy is 100%.

[0040] The preparation process is as follows:

[0041] 1) Batching: weighing and batching according to the respective composition ratios of S alloy and T alloy, and if necessary, physical methods can be used to remove oxides and impurities on the surface of raw materials;

[0042] 2) Alloy smelting: Melt t...

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Abstract

The invention relates to a rare earth permanent magnet alloy material and a preparation process thereof. The rare earth permanent magnet alloy material is a high-coercivity and high-temperature-resistant magnet prepared by mixing two types of alloy. The alloy S is mainly used as the growth foundation of the R2Fe14B phase of crystal grains and used for increasing proportion of the main phase in the magnet and magnetic energy product of the magnet. Part of the alloy T is used for generating the R2Fe14B phase and part of the alloy T is used for generating crystal boundary phase to cover around the main phase of the crystal grains. The coercivity and the high-temperature resistance of the magnet prepared by the preparation process can be improved, heavy rare earth such as Tb, Dy and the like can be saved, more cost can be saved, and competitiveness of products can be improved.

Description

technical field [0001] The invention relates to a permanent magnet material, in particular to a rare earth permanent magnet alloy material and a preparation process thereof. Background technique [0002] NdFeB has extremely high magnetic energy product and coercive force. Since the advent of NdFeB material, it has been widely used in various industries due to its excellent magnetic properties. The main reasons for the change of magnetic properties are temperature, mechanical vibration and magnet oxidation corrosion caused by environmental factors. Since the Curie temperature of NdFeB magnetic materials is only 310°, with the development of aerospace technology, the requirements for the use temperature of materials are getting higher and higher, and higher requirements are also put forward for the high temperature resistance of NdFeB materials. . At present, the method of improving the temperature stability of NdFeB materials is to improve the high temperature resistance of...

Claims

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Application Information

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IPC IPC(8): H01F1/053C22C38/00C22C30/00C22C28/00C21D1/18B22F3/16
Inventor 董生智张有章马世光姚彦军
Owner ORIENT MAGNET TECH OMT
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