Method for preparing single-phase SmCo7 nanocrystalline alloy block material without doping elements

A technology of nanocrystalline alloys and bulk materials, which is applied in the field of preparation of single-phase SmCo7 nanocrystalline alloy bulk materials, can solve problems such as few research reports.

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

However, due to the limitations of the preparation technology, people are interested in SmCo 7 The research of type alloys mainly focuses on the improvement of SmCo by adding elements 7 Phase stability, optimization of multi-element microstructure to improve magnetic properties, etc., while for binary single-phase SmCo 7 There are few research reports on alloys, especially there is no preparation of completely SmCo alloys without doping elements (that is, only containing Sm and Co elements). 7 Research Report on Single Phase Alloy Bulk Materials

Method used

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  • Method for preparing single-phase SmCo7 nanocrystalline alloy block material without doping elements
  • Method for preparing single-phase SmCo7 nanocrystalline alloy block material without doping elements
  • Method for preparing single-phase SmCo7 nanocrystalline alloy block material without doping elements

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Effect test

Embodiment 1

[0022] (1) Mix the metal Sm cut into thin strips and the granular metal Co powder according to the mass ratio of 26.7:73.3, put them into a mold and press them into a block, and put the block into a cold-wall magnetic levitation eddy current induction furnace. The nominal composition of SmCo was prepared by smelting in a copper crucible 7 The alloy ingot is remelted for more than 3 times, and the nominal composition is SmCo 7 master alloy ingot;

[0023] (2) Break the master alloy ingot into powder particles smaller than 500 μm, put the crushed powder particles into a ball mill tank according to the ball mass ratio of 25:1, the speed of ball milling is 400r / min, and the ball milling time is 25 hours , to obtain a completely amorphous alloy powder;

[0024] (3) The amorphous powder obtained by ball milling is put into a cemented carbide mold under the protection of argon and pre-pressed, and then sent to a spark plasma sintering equipment for sintering and densification. The ...

Embodiment 2

[0028] (1) Mix the metal Sm cut into thin strips and the granular metal Co powder according to the mass ratio of 26.7:73.3, put them into a mold and press them into a block, and put the block into a cold-wall magnetic levitation eddy current induction furnace. The nominal composition of SmCo was prepared by smelting in a copper crucible 7 The alloy ingot is remelted for more than 3 times, and the nominal composition is SmCo 7 master alloy ingot;

[0029] (2) Break the master alloy ingot into powder particles smaller than 500 μm, put the crushed powder particles into a ball mill tank according to the mass ratio of ball to material of 25:1, the speed of ball milling is 700r / min, and the ball milling time is 10 hours , to obtain a completely amorphous alloy powder;

[0030] (3) The amorphous powder obtained by ball milling is put into a cemented carbide mold under the protection of argon and pre-pressed, and then sent to a spark plasma sintering equipment for sintering and dens...

Embodiment 3

[0034] (1) Mix the metal Sm cut into thin strips and the granular metal Co powder according to the mass ratio of 26.7:73.3, put them into a mold and press them into a block, and put the block into a cold-wall magnetic levitation eddy current induction furnace. The nominal composition of SmCo was prepared by smelting in a copper crucible 7 The alloy ingot is remelted for more than 3 times, and the nominal composition is SmCo 7 master alloy ingot;

[0035] (2) Break the master alloy ingot into powder particles smaller than 500 μm, put the crushed powder particles into a ball mill tank according to the mass ratio of ball to material of 25:1, the speed of ball milling is 500r / min, and the ball milling time is 20 hours , to obtain a completely amorphous alloy powder;

[0036] (3) The amorphous powder obtained by ball milling is put into a cemented carbide mold under the protection of argon and pre-pressed, and then sent to a spark plasma sintering equipment for sintering and dens...

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Abstract

The invention discloses a method for preparing a single-phase SmCo7 nanocrystalline alloy block material without doping elements, which belongs to the technical field of nanometer materials and novel powder metallurgy. The method comprises the following steps of: mixing metals Sm and Co in the mass ratio of 26.7:73.3, and smelting the mixture to form SmCo7 alloy ingot casting base metal by using a vacuum induction smelting furnace; under the protection of argon gas, crushing the base metal alloy into powder, and placing the powder in a ball milling jar for ball milling to prepare allow powder with an amorphous structure; placing the amorphous alloy powder in a mould, and fast sintering the powder for forming by using spark plasma sintering technology to obtain the single-phase SmCo7 nanocrystalline alloy block material; and placing the single-phase SmCo7 nanocrystalline alloy block material which is obtained by the spark plasma sintering in a vacuum thermal treatment furnace for annealing. The single-phase SmCo7 nanocrystalline alloy prepared by the method has a uniform and fine organization and a pure grain boundary area without precipitated phases, and the method has a simple route, short flow and controllable technical parameters.

Description

technical field [0001] The invention relates to a single-phase SmCo without doping elements 7 The invention discloses a method for preparing a nanocrystalline alloy bulk material, which belongs to the technical field of nanomaterials and new powder metallurgy. Background technique [0002] Materials with metastable structures have many special properties that conventional stable materials do not have, and have very broad application prospects in various military and civilian fields. Generally speaking, metastable materials are prepared under extraordinary conditions (such as high pressure, microgravity, rapid cooling, strong electromagnetic field, large deformation, etc.). Therefore, the research and development direction of metastable materials is also for researchers to discover new materials, new phenomena and An important field of new applications is one of the research hotspots in the field of high-tech materials and advanced technologies in the world today. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22C1/04C22C19/07
Inventor 宋晓艳张哲旭
Owner BEIJING UNIV OF TECH
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