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Preparation of fully dense massive anisotropic nanocrystalline SmCo5 magnet

An anisotropic, nanocrystalline technology used in inductor/transformer/magnet manufacturing, electrical components, circuits, etc.

Inactive Publication Date: 2011-02-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SmCo5 permanent magnet alloy prepared by this method has high magnetic properties, but has the following disadvantages: First, the grain size of the prepared alloy is in the micron scale, so the mechanical properties and resistance of the alloy Corrosion is relatively poor, which limits the scope of application of the alloy to a certain extent; secondly, the traditional powder metallurgy process has problems such as complicated procedures, long production cycle and poor product consistency, which makes the manufacturing cost of the alloy remain high
However, there is no precedent for obtaining dense magnetically anisotropic SmCo5 magnets through alloy plastic deformation.

Method used

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  • Preparation of fully dense massive anisotropic nanocrystalline SmCo5 magnet
  • Preparation of fully dense massive anisotropic nanocrystalline SmCo5 magnet
  • Preparation of fully dense massive anisotropic nanocrystalline SmCo5 magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Sm with a purity greater than 99.9% and Co metal with a purity greater than 99.9% are classified as SmCo 5 After smelting in a vacuum suspension furnace, crush and ball mill for 5 hours to obtain amorphous alloy powder;

[0022] 2) Put the amorphous alloy powder into a tungsten carbide abrasive tool for rapid hot pressing: under a pressure of 100Mpa, at a heating rate of 50°C / min, the temperature is raised from room temperature to 700°C, and kept for 0min, to obtain Fully dense isotropic nanocrystalline SmCo 5 magnet;

[0023] 3) The fully dense isotropic nanocrystalline SmCo 5 The magnet is subjected to rapid hot-pressing deformation treatment: under the pressure of 20Mpa, the temperature is raised to 900°C at a heating rate of 50°C / min, and the temperature is kept for 0min, and the deformation rate is 90%, and the fully dense anisotropic nanocrystalline SmCo is obtained. 5 Magnets (see table for magnetic properties and densities).

Embodiment 2

[0025] 1) Sm with a purity greater than 99.9% and Co metal with a purity greater than 99.9% are classified as SmCo 5 After smelting in a vacuum suspension furnace, crush and ball mill for 5 hours to obtain amorphous alloy powder;

[0026] 2) Put the amorphous alloy powder into a tungsten carbide abrasive tool for rapid hot pressing: under a pressure of 1000Mpa, at a heating rate of 200°C / min, heat up from room temperature to 600°C, and keep it warm for 10min to obtain Fully dense isotropic nanocrystalline SmCo 5 magnet;

[0027] 3) The fully dense isotropic nanocrystalline SmCo 5 The magnet undergoes rapid hot-pressing deformation treatment: under the pressure of 60Mpa, the temperature is raised to 750°C at a heating rate of 150°C / min, and kept for 10min, with a deformation rate of 70%, to obtain fully dense anisotropic nanocrystalline SmCo 5 Magnets (see table for magnetic properties and densities).

Embodiment 3

[0029] 1) Sm with a purity greater than 99.9% and Co metal with a purity greater than 99.9% are classified as SmCo 5 After smelting in a vacuum suspension furnace, crush and ball mill for 5 hours to obtain amorphous alloy powder;

[0030] 2) Put the amorphous alloy powder into a tungsten carbide abrasive tool for rapid hot pressing: under the pressure of 500Mpa, at a heating rate of 100°C / min, the temperature was raised from room temperature to 650°C, and kept for 5min to obtain Fully dense isotropic nanocrystalline SmCo 5 magnet;

[0031] 3) The fully dense isotropic nanocrystalline SmCo 5 The magnet is subjected to rapid hot-pressing deformation treatment: under the pressure of 30Mpa, the temperature is raised to 850°C at a heating rate of 100°C / min, and kept for 5min, with a deformation rate of 80%, and a fully dense anisotropic nanocrystalline SmCo is obtained. 5 Magnets (see table for magnetic properties and densities).

[0032]

[0033] Table 1. Fully dense bulk a...

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Abstract

The invention pertaining to the field of preparing magnetic materials provides a method of preparing full-compact block body eolotropy nanocrystalline SmCo5 magnet for solving the problems that by the conventional sinter method of preparing SmCo5 permanent magnet alloy, the technique is complex, the mechanical performances and corrosion resistance capability of the produced alloy is not good, andthe like.The method comprises steps of preparing key metal for smelting by using Sm and Co according to the mixture ratio of the components of SmCo5, performing the ball mill process to obtain amorphous alloy powder, performing quick hot pressing and heat distortion processes to the amorphous alloy powder sequentially, finally obtaining the ull-compact block body eolotropy nanocrystalline SmCo5 permanent magnet alloy. The method has advantages of simple technique, short production cycle and low cost, and the produced magnet has high degree of compactness, fine grains, a SmCo5 phase C axes crystal texture and high magnetic property.

Description

technical field [0001] The invention belongs to the field of magnetic material preparation, in particular to a fully dense block anisotropic nanocrystalline SmCo 5 The method of making the magnet. Background technique [0002] SmCo 5 Permanent magnet alloy is the first generation of rare earth permanent magnet alloy developed in the 1960s. It not only has excellent intrinsic magnetism, but also has good high-temperature characteristics, that is, the alloy can still maintain high magnetic properties in high-temperature environments. Therefore, this type of permanent magnet material still has good practical value and is widely used in environments with high temperature requirements. [0003] At present, the traditional powder metallurgy method is widely used in industry to prepare SmCo 5 Permanent magnet alloys basically include the following processes: alloy smelting→crushing and powder making→magnetic field orientation pressing→sintering→heat treatment→processing and form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04H01F41/02
Inventor 岳明刘卫强张东涛张久兴吕文春
Owner BEIJING UNIV OF TECH
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