Preparation method of 1: 5 pure samarium-cobalt permanent magnet with high magnetic performance

A permanent magnet, samarium cobalt technology, applied in magnetic objects, magnetic materials, inductance/transformer/magnet manufacturing, etc., can solve the problems of reducing magnetic performance, samarium volatilization, increasing the risk of samarium volatilization, oxidation, etc., to improve magnetic performance Effect

Active Publication Date: 2020-12-18
HANGZHOU PERMANENT MAGNET GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In this prior art, the temperature of the homogenization heat treatment reaches 900-950°C, and the time is as long as 4-8 h. Although the magnetic properties can be improved in theory, the content of samarium in the 1:5 pure samarium-cobalt permanent magnet material is relatively high, and the high-temperature And long-term heat treatment can easily cause samarium to volatilize, so this prior art still cannot get rid of the contradiction of "heat treatment can promote magnetic properties" and "heat treatment causes samarium to volatilize and then reduce magnetic properties"
It can be seen that this prior art not only prolongs the production time, but also inevitably increases the risk of volatilization and oxidation of samarium in the heat treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Smelting and quick-setting flakes; according to the chemical formula SmCo 4.3 A certain amount of samarium metal with a purity of 99.95% and electrolytic cobalt with a purity of 99.98% are weighed and placed in a vacuum quick-setting belt furnace; after vacuuming and heating, the smelting temperature is controlled at 1600±5°C, and the material Cast after refining for 3 minutes; then use SmCo 4.6 Repeat the above operation once to obtain the samarium-rich phase quick-setting strip sheet SmCo 4.3 and cobalt-rich phase quick-setting SmCo 4.6 ; The speed of the copper roller of the vacuum quick-setting throwing belt furnace is 47r / min; the thickness of the throwing sheet is 0.3mm;

[0029] 2. Coarse crushing; SmCo 4.3 and cobalt-rich phase quick-setting SmCo 4.6 Put them into a mortar respectively, crush them with a punching machine, and sieve the coarse crushed powder obtained by crushing to obtain samarium-rich phase alloy coarse powder and cobalt-rich phase alloy ...

Embodiment 2

[0034] 1. Smelting and quick-setting flakes; according to the chemical formula SmCo 4.3 A certain amount of samarium metal with a purity of 99.95% and electrolytic cobalt with a purity of 99.98% are weighed and placed in a vacuum quick-setting belt furnace; after vacuuming and heating, the smelting temperature is controlled at 1600±5°C, and the material Cast after refining for 3 minutes; then use SmCo 4.6 Repeat the above operation once to obtain the samarium-rich phase quick-setting strip sheet SmCo 4.3 and cobalt-rich phase quick-setting SmCo 4.6 ; The speed of the copper roll of the vacuum quick-setting throwing belt furnace is 37r / min; the thickness of the throwing sheet is 0.22mm;

[0035] 2. Coarse crushing; SmCo 4.3 and cobalt-rich phase quick-setting SmCo 4.6 Put them into a mortar respectively, crush them with a punching machine, and sieve the coarse crushed powder obtained by crushing to obtain samarium-rich phase alloy coarse powder and cobalt-rich phase alloy c...

Embodiment 3

[0040] 1. Smelting and quick-setting flakes; according to the chemical formula SmCo 4.3 A certain amount of samarium metal with a purity of 99.95% and electrolytic cobalt with a purity of 99.98% were weighed and put into a vacuum quick-setting belt furnace; after vacuuming and heating, the melting temperature was controlled at 1600±5°C. Cast the material after refining for 3 minutes; then use SmCo 4.6 Repeat the above operation once to obtain the samarium-rich phase quick-setting strip sheet SmCo 4.3 and cobalt-rich phase quick-setting SmCo 4.6 ; The speed of the copper roller of the vacuum quick-setting throwing belt furnace is 57r / min; the thickness of the throwing sheet is 0.15mm;

[0041] 2. Coarse crushing; SmCo 4.3 and cobalt-rich phase quick-setting SmCo 4.6 Put them into a mortar respectively, crush them with a punching machine, and sieve the coarse crushed powder obtained by crushing to obtain samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coa...

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Abstract

The invention discloses a preparation method of a 1: 5 pure samarium-cobalt permanent magnet with high magnetic performance. The preparation method comprises the steps of 1 smelting and quick-settingthrowing sheets; 2 coarse crushing; 3 fine grinding and powdering; 4 compression molding; and 5 sintering. The preparation method has the beneficial effects that two main phase alloy powder with similar components and particle sizes are prepared respectively and serve as a samarium-rich phase and a cobalt-rich phase respectively, the magnet which is stable in temperature and compact in density isobtained through the coupling effect between the two phases, the risks of samarium volatilization and oxidation can be eliminated, and the magnetic performance is effectively improved.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a method for preparing a 1:5 pure samarium cobalt permanent magnet with high magnetic performance. Background technique [0002] 1:5 pure samarium cobalt permanent magnet material, as the name suggests, only contains samarium and cobalt elements in its composition. Compared with the traditional 1:5 type samarium cobalt material, its composition is monotonous and concentrated. It is rigid in nature and lively in chemical properties. Compared with 2:17 SmCo magnets, 1:5 SmCo magnets are easier to saturate in the magnetization process, the required magnetic field is smaller than that of 2:17 SmCo magnets, and the mechanical properties are also superior, which is convenient for online charging. Magnetic, which makes it more popular in some automotive electronics applications. In order to obtain better remanent magnetic properties, the traditional 1:5 samarium cobalt replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/055
CPCH01F41/0266H01F1/0557
Inventor 冯建涛赵宇卓宇樊金奎
Owner HANGZHOU PERMANENT MAGNET GRP
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