A preparing method of a nanocrystal Sm<2>Co<17>/Co double-phase composite permanent magnetic alloy

A permanent magnetic alloy and nanocrystalline technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., to achieve the effects of strong exchange coupling, high interface bonding strength, and saving rare earth usage

Active Publication Date: 2015-07-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem of preparing nanocrystalline two-phase composite permanent magnet alloy in the prior art, the object of the present invention is to provide a nanocrystalline Sm with controllable grain size and uniform distribution. 2 co 17 Preparation method of / Co dual-phase composite permanent magnet alloy

Method used

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  • A preparing method of a nanocrystal Sm&lt;2&gt;Co&lt;17&gt;/Co double-phase composite permanent magnetic alloy
  • A preparing method of a nanocrystal Sm&lt;2&gt;Co&lt;17&gt;/Co double-phase composite permanent magnetic alloy
  • A preparing method of a nanocrystal Sm&lt;2&gt;Co&lt;17&gt;/Co double-phase composite permanent magnetic alloy

Examples

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Embodiment 1

[0028] Using elemental Co block, Si powder, and Sm block as raw materials, according to the requirement of atomic ratio Sm:(Co+Si)=1:9.8, the above raw materials are combined by SmCo 8.9 Si 0.9 The components are smelted, remelted and annealed in a suspension induction melting furnace to obtain a parent phase alloy with uniform composition. Annealing, the temperature is 1273K, heat preservation 10h, cooling with the furnace.

[0029] Mechanically crush the parent phase alloy until the particle size is less than 1mm, put it into a ball mill tank filled with high-purity argon, the ball-to-material ratio is 15:1, the speed is 600r / min, the ball milling time is 20h, every 2h of operation is paused for more than 2h, and the non- Crystal alloy powder.

[0030] Preparation of nanocrystalline SmCo from amorphous alloy powder by discharge fixed ion sintering 8.9 Si 0.9 alloy, the final sintering temperature is 700K, the heat preservation is 5min, and the constant pressure is 500MPa...

Embodiment 2

[0033] Using elemental Co block, Si powder, and Sm block as raw materials, according to the requirement of atomic ratio Sm:(Co+Si)=1:9.8, the above raw materials are combined by SmCo 8.6 Si 1.2 The components are smelted, remelted and annealed in a suspension induction melting furnace to obtain a parent phase alloy with uniform composition. Annealing, the temperature is 1173K, keep warm for 10h, and cool with the furnace.

[0034] Mechanically crush the parent phase alloy until the particle size is less than 1mm, put it into a ball mill tank filled with high-purity argon, the ball-to-material ratio is 15:1, the speed is 300r / min, the ball milling time is 20h, and every 2h is paused for more than 2h to obtain non- Crystal alloy powder.

[0035] Preparation of nanocrystalline SmCo from amorphous alloy powder by discharge fixed ion sintering 8.6 Si 1.2 alloy, the final sintering temperature is 723K, the heat preservation is 5min, and the constant pressure is 500MPa, the obtai...

Embodiment 3

[0038] Using elemental Co block, Si powder, and Sm block as raw materials, according to the requirement of atomic ratio Sm:(Co+Si)=1:9.8, the above raw materials are combined by SmCo 9.75 Si 0.05 The components are smelted, remelted and annealed in a suspension induction melting furnace to obtain a parent phase alloy with uniform composition. Annealing, the temperature is 1373K, heat preservation 10h, cooling with the furnace.

[0039] Mechanically crush the parent phase alloy until the particle size is less than 1mm, put it into a ball mill tank filled with high-purity argon, the ball-to-material ratio is 15:1, the speed is 1000r / min, the ball milling time is 20h, and every 2h is paused for more than 2h to obtain non- Crystal alloy powder.

[0040] Preparation of nanocrystalline SmCo from amorphous alloy powder by discharge fixed ion sintering 9.75 Si 0.05 alloy, the final sintering temperature is 663K, the heat preservation is 5min, and the constant pressure is 500MPa, t...

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Abstract

The invention provides a preparing method of a nanocrystal Sm<2>Co<17>/Co double-phase composite permanent magnetic alloy, and belongs to the technical field of double-phase composite permanent magnetic alloys. The method includes smelting a pure Sm block, a Co block and an elementary substance of an added element under the protection of argon to obtain a multi-component parent phase alloy; allowing phases and component distribution of the parent phase alloy to be uniform by a plurality of times of remelting and homogenizing annealing; preparing the parent phase alloy into amorphous powder by utilization of high-energy ball milling under the protection of an inert gas; preparing the amorphous powder into an initial nanocrystal alloy block which is a metastable phase alloy by spark plasma sintering; and preparing the nanocrystal Sm<2>Co<17>/Co double-phase composite permanent magnetic alloy by a thermal treatment process. The method has advantages of uniform crystal grain size distribution, controllable crystal grain size, controllable phase composition, controllable phase stability, and the like.

Description

technical field [0001] The invention belongs to the field of powder metallurgy technology and magnetic materials. Concretely relate to a nanocrystalline Sm 2 co 17 A preparation method of / Co dual-phase composite permanent magnet alloy. Background technique [0002] Rare earth permanent magnet materials are usually alloys formed of rare earth metals and transition metals, and have a wide range of applications in electric vehicles, acoustic devices, industrial instruments and medical devices. Among them, Sm-Co permanent magnet alloy has become the preferred alloy system for high-temperature permanent magnet alloys because of its excellent intrinsic magnetic properties and high Curie temperature. [0003] The mature products of rare earth permanent magnet materials have been integrated into all aspects of the national economy and people's livelihood, but there are still many shortcomings and room for improvement. However, in the past two decades, there has been a lack of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22F1/00H01F1/053
Inventor 宋晓艳刘东王海滨刘雪梅华刚
Owner BEIJING UNIV OF TECH
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