Preparation method of super high coercivity and low-Co type Sm-Co nanocrystalline alloy

A nanocrystalline alloy, coercive force technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of small coercive force, weak hard magnetic properties, and few research reports.

Active Publication Date: 2011-08-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional coarse-grained Sm-Co intermetallic compound system, low-Co Sm-Co alloy compounds show very weak hard magnetic properties and very small coercive force, so people rarely report on them.

Method used

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  • Preparation method of super high coercivity and low-Co type Sm-Co nanocrystalline alloy
  • Preparation method of super high coercivity and low-Co type Sm-Co nanocrystalline alloy
  • Preparation method of super high coercivity and low-Co type Sm-Co nanocrystalline alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mix flaky Co with a purity of 99.9% or higher and small pieces of metal Sm with a purity of 99.95% or higher at an atomic ratio of 3:1 (x=3), and coat the small pieces of Sm evenly with the flakes of Co The raw material is then smelted in a cold-wall magnetic levitation eddy current induction furnace to prepare a nominal composition of SmCo 3 The alloy ingot, the alloy ingot is remelted more than 2 times, and the nominal composition is SmCo 3 master alloy ingot;

[0025] (2) SmCo obtained from step (1) 3 The master alloy ingot is placed in a vacuum annealing furnace, and the gas pressure in the furnace is less than 4×10 -3 Pa. Rapidly raise the temperature to 900°C for 30 hours of isothermal homogenization annealing treatment, and then cool to room temperature with the furnace;

[0026] (3) SmCo after homogenization annealing 3 The alloy is crushed into powder particles smaller than 300 μm, and the crushed powder particles are put into a ball milling tank accor...

Embodiment 2

[0030] (1) Mix flake-shaped Co with a purity of 99.9% or higher and small pieces of metal Sm with a purity of 99.95% or higher at an atomic ratio of 7:2 (x=3.5), and wrap the flakes of Co evenly around the small pieces of Sm raw material , and then smelted with a cold-wall magnetic levitation eddy current induction furnace to prepare a nominal composition of Sm 2 co 7 The alloy ingot, the alloy ingot is remelted more than 2 times, and the nominal composition is Sm 2 co 7 master alloy ingot;

[0031] (2) Sm obtained from step (1) 2 co 7 The master alloy ingot is placed in a vacuum annealing furnace, and the gas pressure in the furnace is less than 8×10 -3 Pa. Rapidly raise the temperature to 1000°C for 25 hours of isothermal homogenization annealing treatment, and then cool to room temperature with the furnace;

[0032] (3) Sm after homogenization annealing 2 co 7 The alloy is crushed into powder particles smaller than 300 μm, and the crushed powder particles are put i...

Embodiment 3

[0036] (1) Flake-shaped Co with a purity of 99.9% or more and small pieces of metal Sm with a purity of 99.95% or more are mixed at an atomic ratio of 19:5 (x=3.8), and the flakes of Co are uniformly wrapped around the small pieces of Sm The raw material is then smelted in a cold-wall magnetic levitation eddy current induction furnace to prepare a nominal composition of Sm 5 co 19 The alloy ingot, the alloy ingot is remelted more than 2 times, and the nominal composition is Sm 5 co 19 master alloy ingot;

[0037] (2) Sm obtained from step (1) 5 co 19 The master alloy ingot is placed in a vacuum annealing furnace, and the gas pressure in the furnace is less than 1×10 -2 Pa. Rapidly raise the temperature to 1200°C for 20 hours of isothermal homogenization annealing treatment, and then cool to room temperature with the furnace;

[0038] (3) Sm after homogenization annealing 5 co 19 The alloy is crushed into powder particles smaller than 300 μm, and the crushed powder par...

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Abstract

The invention discloses a preparation method of a super high coercivity and low-Co type Sm-Co nanocrystalline alloy, belonging to the technical fields of nanophase materials, novel functional materials and powder metallurgy. The preparation method comprises the following steps of: firstly, preparing a rare earth element Sm with the purity of over 99.95 percent and a rare earth element Co with the purity of over 99.9 percent into a mother alloy with a target component according to a mole ratio of 1:x; melting into an SmCoX alloy cast ingot by using a vacuum induction melt furnace and carrying out homogenizing annealing on the alloy casting ingot for a long time; secondly, crushing the annealed alloy into powder under the protection of argon gas; carrying out high-energy ball milling on the powder to prepare amorphous state alloy powder; and finally, quickly sintering amorphous powder to form by using the traditional discharge plasma sintering technology and obtaining a single-phase SmCox nanocrystalline material. By using the method disclosed by the invention, the super high coercivity and low-Co type Sm-Co nanocrystalline alloy can be prepared without adding any element; and the method has the advantages of simple process path, short flow and strong controllability for technical parameters.

Description

technical field [0001] The invention relates to a method for preparing a Sm-Co nanocrystalline bulk material, in particular to a method for preparing a low-Co type Sm-Co nanocrystalline bulk material with ultra-high coercive force and no doping elements, belonging to nanomaterials, New functional materials and powder metallurgy technology field. Background technique [0002] High-temperature-resistant magnetic materials are the key to the development of high-temperature torque motors and high-speed hydraulic-electric integrated energy devices, and play a very important role in aerospace and military fields. Among the rare earth permanent magnet materials that have been developed so far, Sm□Co alloy magnets are the first choice for the development of high temperature permanent magnet materials. However, with the rapid development of national defense construction and high-tech, the requirements for the performance of magnets are constantly increasing, and the existing high-pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/04H01F1/055
Inventor 宋晓艳张哲旭李定朋
Owner BEIJING UNIV OF TECH
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