Method of manufacturing single-phase Sm2Co17 nanocrystalline block body material

A technology of bulk materials and nanocrystals, applied in polycrystalline material growth, crystal growth, single crystal growth, etc., can solve the problems of few research reports on nanocrystal bulk materials, and achieve strong controllability of technical parameters, The grain boundary area is pure and free, and the effect of inhibiting long-range diffusion

Inactive Publication Date: 2010-03-24
BEIJING UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the Sm of the nanocrystalline structure is 2 co 17 The research on Sm-type alloys mainly focuses on two-phase or multi-phase alloy systems, but limited by the preparation technology, for single-phase Sm 2 co 17 There are very few research reports on nanocrystalline bulk materials

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  • Method of manufacturing single-phase Sm2Co17 nanocrystalline block body material
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  • Method of manufacturing single-phase Sm2Co17 nanocrystalline block body material

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Embodiment 1

[0023] 1) Mix the small metal Sm and Co according to the mass ratio of 23.1%:76.9%, so that the Co raw material is wrapped around the Sm raw material. CuCr25 alloy prepared by smelting method", High Voltage Apparatus, No. 37, Volume 2, Page 14) the same vacuum induction melting procedure to prepare Sm 2 co 17 Alloy ingots, the alloy ingots are remelted twice;

[0024] 2) Put Sm 2 co 17 The alloy ingot is crushed and ground into powder particles smaller than 500 μm, and the powder particles are put into a ball mill pot according to the ratio of ball to material mass ratio of 10:1, and ball milled for 20 hours to obtain a completely amorphous alloy powder;

[0025] 3) Put the amorphous alloy powder into the cemented carbide mold under the protection of argon and cold press it into the spark plasma sintering equipment for sintering and densification. The following process parameters are adopted: the final sintering temperature is 700°C, The speed is 50°C / min, the sintering pr...

Embodiment 2

[0028] 1) Mix the small metal Sm and Co according to the mass ratio of 23.1%:76.9%, so that the Co raw material is wrapped around the Sm raw material. CuCr25 alloy prepared by smelting method", High Voltage Apparatus, No. 37, Volume 2, Page 14) the same vacuum induction melting procedure to prepare Sm 2 co 17 Alloy ingots, the alloy ingots are remelted three times;

[0029] 2) Put Sm 2 co 17 The alloy ingot is crushed and ground into powder particles smaller than 500 μm, and the powder particles are put into a ball mill jar according to the ratio of ball to material mass ratio of 20:1, and ball milled for 10 hours to obtain a completely amorphous alloy powder;

[0030] 3) Put the amorphous alloy powder into the cemented carbide mold under the protection of argon and cold press it into the spark plasma sintering equipment for sintering and densification. The following process parameters are adopted: the final sintering temperature is 800°C, The rate is 100°C / min, the sinter...

Embodiment 3

[0033] 1) Mix the small metal Sm and Co according to the mass ratio of 23.1%:76.9%, so that the Co raw material is wrapped around the Sm raw material. CuCr25 alloy prepared by smelting method", High Voltage Apparatus, No. 37, Volume 2, Page 14) the same vacuum induction melting procedure to prepare Sm 2 co 17 Alloy ingots, the alloy ingots are remelted 4 times;

[0034] 2) Put Sm 2 co 17 The alloy ingot is crushed and ground into powder particles smaller than 500 μm, and the powder particles are put into a ball mill pot according to the ratio of ball to material mass ratio of 12:1, and ball milled for 15 hours to obtain a completely amorphous alloy powder;

[0035] 3) Put the amorphous alloy powder into the cemented carbide mold under the protection of argon and cold press it into the spark plasma sintering equipment for sintering and densification. The following process parameters are adopted: the final sintering temperature is 750°C, The rate is 80°C / min, the sintering pre...

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Abstract

The invention provides a method for preparing a single phase Sm2Co17 nanocrystalline bulk material, belonging to the nano material and novel powder metallurgy technical field. The prior research on the nanocrystal Sm2Co17 alloy concentrates in the alloy systems with two phases or multi-phases. In the method, the metals of Sm and Co are mixed according to the mol ratio of 2 to 17, Sm2Co17 alloy ingots are prepared by the vacuum induction melting; under the protection of argon gas, the alloy ingots are crushed and ground into powder with the particle diameter of less than 500mu m, and the powderis put in a ball milling cylinder for ball milling to prepare non-crystalline alloy powder; the non-crystalline alloy powder is put in a mould for quick sintering forming by utilizing the prior sparkplasma sintering technique so as to prepare the single phase Sm2Co17 nanocrystalline bulk material. The method has the advantages of simple process and strong controllability, and the single phase Sm2Co17 nanocrystalline bulk material prepared by the method has the advantages of complete densification, uniform and fine crystal grains, purified crystal boundary areas and no precipitated phase at the crystal boundary areas, etc.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and novel powder metallurgy, and specifically relates to a single-phase Sm 2 co 17 Preparation method of nanocrystalline bulk material. Background technique [0002] Since the appearance of nanomaterials and nanotechnology, it has been a research and development hotspot in the field of materials science and engineering at home and abroad. The unique structural features of nanocrystalline bulk materials with high-density grain boundaries make them exhibit significant performance advantages compared with traditional coarse-grained bulk materials. [0003] SM 2 co 17 Type alloys are widely used in precision machine tools, measuring instruments, magnetic bearings and various permanent magnet motors because of their superior magnetic properties, high thermal stability and good corrosion resistance, especially in the fields of national defense and military industry even more important. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/07C22C1/04C30B29/52
Inventor 宋晓艳卢年端张久兴于成伟
Owner BEIJING UNIV OF TECH
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