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Method for preparing Sm-Co binary alloy amorphous block material

A technology of bulk materials and binary alloys, applied in the field of new powder metallurgy

Inactive Publication Date: 2009-12-30
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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This preparation method has not been reported at home and abroad at present

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  • Method for preparing Sm-Co binary alloy amorphous block material
  • Method for preparing Sm-Co binary alloy amorphous block material
  • Method for preparing Sm-Co binary alloy amorphous block material

Examples

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example 1

[0018] Example 1. First mix pure metal Sm and Co according to the mass ratio of 56.1%: 43.9%, and use a vacuum induction melting furnace to prepare single-phase SmCo 2 alloy ingot. Under argon protection, the SmCo 2 The alloy ingot is broken into powder particles below 200μm. Under the protection of argon, the powder was ball milled, the ball to material ratio was 18:1, the ball milling speed was 500r / min, and the ball milling time was 8 hours, thus obtaining amorphous SmCo 2 alloy powder. Put the amorphous alloy powder into a cemented carbide mold, form it under pressure, and send it into the vacuum sintering chamber of the spark plasma sintering system. The sintering process parameters are: sintering temperature 330°C; sintering heating rate 100°C / min; sintering pressure 600MPa; no heat preservation when the sintering temperature is reached. A completely amorphous Sm-Co binary alloy bulk material (SmCo 2 Structural characterization of parent metal ingot, amorphous alloy...

example 2

[0019] Example 2, first mix pure metal Sm and Co according to the mass ratio of 56.1%: 43.9%, and use a vacuum induction melting furnace to prepare single-phase SmCo 2 alloy ingot. Under the protection of argon, the SmCo 2 The alloy ingot is broken into powder particles below 200μm. Under the protection of argon, the powder was ball milled, the ball to material ratio was 15:1, the ball milling speed was 600r / min, and the ball milling time was 10 hours, thus obtaining amorphous SmCo 2 alloy powder. Put the amorphous alloy powder into a cemented carbide mold, form it under pressure, and send it into the vacuum sintering chamber of the spark plasma sintering system. The sintering process parameters are: sintering temperature 300°C; sintering heating rate 80°C / min; sintering pressure 1GPa; no heat preservation when the sintering temperature is reached. A completely amorphous Sm-Co binary alloy bulk material (SmCo 2 Structural characterization of parent metal ingot, amorphous ...

example 3

[0020] Example 3, first mix pure metal Sm and Co according to the mass ratio of 23.1%:76.9%, and use a vacuum induction melting furnace to prepare single-phase Sm 2 co 17 alloy ingot. Under the protection of argon, the Sm 2 co 17 The alloy ingot is broken into powder particles below 200μm. Under the protection of argon, the powder was ball-milled, the ball-to-material ratio was 20:1, the ball-milling speed was 550r / min, and the ball-milling time was 12 hours, thereby obtaining amorphous Sm 2 co 17 alloy powder. Put the amorphous alloy powder into a cemented carbide mold, form it under pressure, and send it into the vacuum sintering chamber of the spark plasma sintering system. The sintering process parameters are: sintering temperature 400°C; sintering heating rate 120°C / min; sintering pressure 500MPa; no heat preservation when the sintering temperature is reached. A completely amorphous Sm-Co binary alloy bulk material (Sm 2 co 17 Structural characterization of paren...

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Abstract

The present invention relates to a preparation method for Sm-Co binary alloy amorphous block body material, and belongs to the powder metallurgy technology field. Because the majority of the binary alloy phase have positive formation enthalpy, the production of amorphous alloy powder with the mechanical alloying method is extremely difficult. The present invention has the steps that pure metals Sm and Co are proportioned and blended according to single phase alloy, and single phase Sm-Co alloy cast ingot is produced by smelting with a vacuum induction furnace; the Sm-Co alloy cast ingot is crushed to be powder grains of below 200 micron, the powder grains are charged into a mill pot with a ball / powder weight ratio of 15:1 to20:1, and after ball milling for eight to twelve hours, the complete amorphous alloy powder can be obtained; under the argon shield, the amorphous alloy powder is charged into a hard alloy die for cold press moulding, is delivered into electric discharge plasma sintering equipment for sintering and densification: the final state sintering temperature is 300-400 DEG C, the temperature rise rate is 80-120 DEG C / min, the sintering pressure is 500 MPa-1 GPa, and heat is not reserved at the final state sintering temperature. The present invention is not limited by the positive formation enthalpy of the binary alloy, and the Sm-Co alloy amorphous block body material has high density and high structural stability.

Description

technical field [0001] The invention discloses a method for preparing an Sm-Co binary alloy amorphous bulk material, which belongs to the technical field of new powder metallurgy. Background technique [0002] Bulk amorphous materials have excellent mechanical properties such as high hardness, high strength, and the possibility of superplastic deformation, as well as excellent chemical properties such as high corrosion resistance, so they have attracted much attention as high-performance structural materials. In recent years, it has been found that the Co-based amorphous alloy magnetic material is one of the most excellent soft magnetic materials at present. It has high magnetic permeability, low coercive force and magnetic loss, and can be used to make electronic transformers, magnetic heads and other devices. . Therefore, exploring and developing Co-based amorphous alloys has become a hot research direction in the field of materials and physics in the world today. So far...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C45/00B22F9/04B22F3/16
Inventor 宋晓艳闫相全卢年端张久兴
Owner BEIJING UNIV OF TECH
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