A kind of high-performance permanent magnet material and preparation method thereof

A permanent magnetic material and magnetic field technology, applied in the field of AlNiCo permanent magnetic material and its preparation, can solve the problems of increased difficulty of columnar crystal structure, increased difficulty of high magnetic energy product, increased brittleness, etc.

Active Publication Date: 2018-06-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of Al content will lead to the increase of the brittleness of the material, and the increase of Ti will refine the grain of the material. With the increase of Ti content, the difficulty of obtaining columnar grain structure will also increase, and the difficulty of obtaining high magnetic energy product will increase relatively. Especially when the Ti content is greater than 8% (mass fraction), castings with better columnar crystals cannot be obtained under current industrial production conditions.

Method used

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  • A kind of high-performance permanent magnet material and preparation method thereof
  • A kind of high-performance permanent magnet material and preparation method thereof
  • A kind of high-performance permanent magnet material and preparation method thereof

Examples

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preparation example Construction

[0131] Preparation of AlNiCo Permanent Magnets

[0132] The present invention also provides the preparation method of above-mentioned material, described method comprises the steps:

[0133] (1) Melting the mixture of each component to obtain a smelting mixture;

[0134] (2) pouring with the smelted mixture to obtain a crystal orientation alloy, and performing solid solution treatment;

[0135] (3) placing the smelted alloy through solution treatment in a magnetic field to cool;

[0136] (4) Performing magnetic field isothermal heat treatment on the cooled smelted alloy to obtain the material.

[0137] In another preferred example, in the pouring step, the temperature of the smelted mixture is controlled at 1600-1700°C, preferably 1630-1670°C.

[0138] In order to obtain materials with better properties, the smelted mixture needs to be cooled in a magnetic field. Preferably, in the cooling step, the orientation direction of the smelted mixture is parallel to the direction ...

Embodiment 1

[0174] A high-coercivity high-performance alnico permanent magnet alloy according to Al: 8.6%; Ni: 14.5%; Co: 44.0%; Cu: 4.0%; Ti: 8.4%; C: 0.08%; FeS: 1.1%; Si: 0.25%; Fe is the remaining design component, prepared after preparing raw materials.

[0175] A preparation process of a high-coercivity high-performance alnico permanent magnet alloy is carried out according to the following steps:

[0176] (1) Modeling: Mix bauxite with different particle sizes, add bentonite and an appropriate amount of water as a binder, mix well, let it stand for 24 hours, and then start modeling. The sand mold consists of an eight-piece honeycomb mold and a riser.

[0177] (2) Melting and pouring: Melting in a medium-frequency induction melting furnace. After melting Co, Ni, Fe, and Cu, four high-melting point elements, add C powder with a particle size of about tens of μm to spread it evenly on the molten steel. Surface, react for about 30 seconds, add Si, FeS, Ti, Al into the molten steel, s...

Embodiment 2

[0186] A high-coercivity high-performance alnico permanent magnet alloy according to Al: 8.4%; Ni: 14%; Co: 40.0%; Cu: 3.0%; Ti: 8.2%; C: 0.08%; FeS: 1.1%; Si: 0.25%; Fe is the remaining design component, prepared after preparing raw materials.

[0187] A method for preparing a high-coercivity high-performance alnico permanent magnet alloy is carried out according to the following steps:

[0188] (1) Modeling: Mix bauxite with different particle sizes, add bentonite and an appropriate amount of water as a binder, mix well, let it stand for 24 hours, and then start modeling. The sand mold consists of an eight-piece honeycomb mold and a riser.

[0189] (2) Melting and pouring: Melting in a medium-frequency induction melting furnace. After melting Co, Ni, Fe, and Cu, four high-melting point elements, add C powder with a particle size of about tens of μm to spread it evenly on the molten steel. Surface, react for about 30 seconds, add Si, FeS, Ti, Al into the molten steel, stir ...

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Abstract

The invention provides a high-performance permanent magnet material and a production method thereof, and particularly provides a permanent magnet material. The permanent magnet material comprises, by total weight, 30-50% of cobalt, 6-10% of titanium, 12-16% of nickel and 6-10% of aluminum. The permanent magnet material has excellent physical and magnetic performance.

Description

technical field [0001] The invention relates to the field of preparation of permanent magnet materials, in particular, the invention provides an AlNiCo permanent magnet material and a preparation method thereof. Background technique [0002] As the first generation of permanent magnets, alnico permanent magnet materials have lower magnetic properties than NdFeB and SmCo permanent magnet materials, but because of their excellent temperature stability and time stability, the operating temperature can reach above 600°C. Good stability, corrosion resistance and not easy to oxidize, making it irreplaceable in the military field, especially suitable for torpedoes, missiles, aircraft and other weapons and satellites and other spacecraft that require high precision and good stability. [0003] Compared with the second-generation and third-generation permanent magnet materials, the remanence of AlNiCo permanent magnet materials is comparable, but the coercive force and magnetic energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/047C22C30/00C22C1/02C22F1/00C22F3/00
Inventor 孙颖莉罗仪铭冯孝超李东闫阿儒刘涛
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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