(2:17)-type SmCoCuFeZrB sintered permanent magnet and preparation method thereof

A technology of permanent magnets and magnets, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem that the high residual magnetization cannot be effectively used, the intrinsic coercive force of the magnet decreases, and the Anisotropy and other problems, to achieve the effect of optimizing high temperature comprehensive magnetic properties, optimizing magnetic properties, and increasing the maximum magnetic energy product

Active Publication Date: 2020-05-19
CHINA JILIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if increasing the Fe content can effectively increase the residual magnetization of the magnet, the deterioration of the coercive force of the magnet prevents the high residual magnetization from being effectively utilized, which greatly limits the maximum energy product of the sintered 2:17 type samarium cobalt permanent magnet material. further improvement
The traditional sintered 2:17 samarium cobalt permanent magnet has a cell wall phase of SmCo 5 phase, excessive replacement of Co atoms by Fe atoms will greatly reduce the anisotropy of the phase, resulting in the inability to effectively pin the main phase magnetic domains, and the intrinsic coercive force of the magnet will decrease.

Method used

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  • (2:17)-type SmCoCuFeZrB sintered permanent magnet and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Ingredients: alloy molecular formula is: Sm(Co 0.59 Fe 0.35 Cu 0.01 Zr 0.03 B 0.02 ) 7.8 , according to the atomic number ratio of each element in the alloy molecular formula, calculate the mass percentage of each element, and weigh the required raw materials: Sm (purity is 99.9%), Co (purity is 99.9%), Cu (purity is 99.9%) , Zr (purity is 99.9%), Fe (purity is 99.9%), Fe-B alloy (wherein, the mass fraction of B is 18.9%);

[0028] (2) Prepare alloy ingots: adopt induction melting plus copper mold water cooling process to prepare alloy ingots;

[0029] Put the raw materials prepared in step (1) into the crucible of the vacuum induction melting furnace in turn, and first vacuumize the furnace body to 10 -1 ~10 -3 Pa, increase the power until the smelting is uniform, and cast it into a water-cooled copper mold to obtain an alloy ingot; in this step (2), both smelting and casting are carried out under the protection of argon.

[0030] (3) Preparation of magneti...

Embodiment 2

[0036] (1) Ingredients: alloy molecular formula is: Sm(Co 0.61 Fe 0.30 Cu 0.02 Zr 0.04 B 0.03 ) 7.6 Calculate the mass percent of each element according to the ratio of the number of atoms in the alloy molecular formula, and take the required raw materials by mass percent: Sm (purity is 99.9%), Co (purity is 99.9%), Cu (purity is 99.9%), Zr (purity is 99.9%), Fe (purity is 99.9%), Fe-B alloy (wherein, the mass fraction of B is 18.9%);

[0037] (2) Prepare alloy ingots: adopt induction smelting plus copper mold water cooling process to prepare alloy ingots; put the raw materials prepared in step (1) into the crucible of vacuum induction melting furnace in turn, and first vacuumize the furnace body to 10 -1 ~10 -3 Pa, increase the power until the smelting is uniform, and cast it into a water-cooled copper mold to obtain an alloy ingot; in this step (2), smelting and casting are all carried out under the protection of argon;

[0038] (3) Preparation of magnetic powder: use...

Embodiment 3

[0046] (1) Ingredients: alloy molecular formula is: Sm(Co 0.82 Fe 0.1 Cu 0.02 Zr 0.04 B 0.02 ) 7.1 ; According to the atomic number ratio of each element in the alloy molecular formula, the mass percentage of each element is calculated, and the required raw materials are taken by mass percentage: Sm (purity is 99.9%), Co (purity is 99.9%), Cu (purity is 99.9%) %), Zr (purity is 99.9%), Fe (purity is 99.9%), Fe-B alloy (mass fraction of B is 18.9%);

[0047] (2) Prepare alloy ingots: adopt induction smelting plus copper mold water cooling process to prepare alloy ingots; put the raw materials prepared in step (1) into the crucible of vacuum induction melting furnace in turn, and first vacuumize the furnace body to 10 -1 ~10 -3 Pa, increase the power until the smelting is uniform, and cast it into a water-cooled copper mold to obtain an alloy ingot; in this step (2), smelting and casting are all carried out under the protection of argon;

[0048] (3) Preparation of magnet...

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Abstract

The invention discloses a (2:17)-type SmCoCuFeZrB sintered permanent magnet. The element composition formula of the sintered permanent magnet is Smx(Co1-a-b-c-dFeaCubZrcBd)z, wherein the symbols x, a,b, c, d and z in the formula represent composition ranges of limited elements, and the atomic number ratio of x to a to b to c to d to z is 1:(0.01-0.4):(0-0.03):(0.01-0.05):(0.01-0.04):(6.8-8.4); the magnet has a cellular structure, a cell wall phase is an Sm(CoFeCu)4B phase with a 1:4:1 type crystal structure, and an intracellular main phase is an Sm2(CoFe)17B phase. The invention also discloses a preparation method of the sintered permanent magnet, and the density and orientation degree of the sintered permanent magnet prepared by adoption of the method are incomparable to those of nanocrystalline and amorphous magnets; a heat treatment process, an oxygen control process and the like are matched, uncontrolled decomposition of the phase of the magnet in the heat treatment process is effectively inhibited, effective regulation and control of the microstructure and phase composition are achieved, the adding amount of the Fe element in the sintered (2:17)-type samarium-cobalt magnet isincreased, the intrinsic coercive force of the magnet under the high Fe content is improved, and then the maximum magnetic energy product of the sintered (2:17)-type samarium-cobalt magnet is increased.

Description

technical field [0001] The invention relates to a sintered rare earth permanent magnet intermetallic compound material, in particular to a 2:17 type SmCoCuFeZrB sintered permanent magnet and a preparation method thereof. Background technique [0002] The 2:17 type samarium cobalt permanent magnet material has an irreplaceable role in high temperature and high stability applications due to its high magnetic properties, excellent temperature stability and corrosion resistance, and is widely used in high temperature sensors, magnetic bearings and other instruments on the device. [0003] At present, commercial sintered 2:17 samarium cobalt permanent magnet materials usually use only five elements: Sm\Co\Fe\Cu\Zr. Diffusion provides channels, Cu elements are mainly enriched in the cell wall SmCo 5 The pinning effect on the magnetic domain of the main phase is formed in the H phase, so that the magnet obtains a higher coercive force, and the Fe element is mainly enriched in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F1/0577H01F41/0266B22F3/04B22F3/1017C22C1/03C22B9/04C22B9/003B22F9/04B22F3/24C21D11/005B22F2003/248B22F2998/10Y02P10/25
Inventor 俞能君单杰峰张朋越泮敏翔吴琼葛洪良
Owner CHINA JILIANG UNIV
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