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A kind of preparation method of rare earth cobalt-based material

A base material, rare earth cobalt technology, applied in the direction of magnetic materials, inorganic materials, electrical components, etc., can solve the problems of long time consumption and low preparation efficiency, and achieve the effects of shortening time, improving grinding efficiency and reducing content

Active Publication Date: 2018-01-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional hydrogen destruction process takes a long time, resulting in low overall production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides a method for preparing a rare earth cobalt-based material, which comprises the following steps:

[0027] S1, preparing alloy ingots by smelting according to the ratio of each element, wherein the chemical atomic measurement formula of the alloy ingots is Sm 1-x R x (Co 1-a-b-c Fe a Cu b Zr c ) z , R is one or more of Ce, Pr, Nd, Gd, Tb, Dy, Ho and Er, 0≤x≤0.5, 0≤a≤0.5, 0≤b≤0.15, 0≤c≤0.04, 6.8≤z≤8.5;

[0028] S2, absorbing hydrogen for 2 hours to 5 hours by casting the alloy ingot at a hydrogen absorption temperature of 10°C to 180°C and a hydrogen pressure of 0.2MPa to 0.5MPa to obtain hydrogen broken powder;

[0029] S3, continue crushing the hydrogen crushing powder with a jet mill to obtain magnetic powder; and

[0030] S4, sequentially performing orientation molding, cold isostatic pressing, sintering solid solution and aging treatment on the magnetic powder to obtain a rare earth cobalt-based material.

[0031] In step S1, the prepar...

Embodiment 1

[0054] Weigh raw materials by composition, wherein: Sm 24.54wt%, Co 48.25wt%, Fe 20.00wt%, Cu4.88wt%, Zr 2.33wt%, the chemical atomic weight formula of the alloy ingot is Sm(Co 0.64 Fe 0.28 Cu 0.06 Zr 0.02 ) 7.84 .

[0055] 1) Alloy smelting: put Sm, Co and other elements with a purity of more than 99.9% in the composition ratio, place them in an induction melting furnace, and vacuumize to 2×10 -2 Below Pa, then fill it with 0.06MPa high-purity argon gas, heat it with electricity, and pour it into a water-cooled splint copper mold after the raw material is completely melted into a liquid to obtain an alloy ingot.

[0056] 2) Hydrogen absorption and crushing: the alloy ingot is placed at 25°C and the hydrogen pressure is 0.43MPa to absorb hydrogen for 3 hours. The alloy ingot is hydrogen-absorbed and crushed after hydrogen absorption, and the crushed powder is not subjected to dehydrogenation treatment. , to obtain a hydrogen powder with a hydrogen content of about 1700ppm...

Embodiment 2

[0072] Weigh raw materials by composition, wherein: Sm 24.56wt%, Co 47.33wt%, Fe 21.46wt%, Cu4.31wt%, Zr 2.34wt%, the chemical atomic weight formula of the alloy ingot is Sm(Co 0.627 Fe 0.30 Cu 0.053 Zr 0.02 ) 7.84 .

[0073] 1) Alloy smelting: put Sm, Co and other elements with a purity of more than 99.9% in the composition ratio, place them in an induction melting furnace, and vacuumize to 2×10 -2 Below Pa, then fill it with 0.06MPa high-purity argon gas, heat it with electricity, and pour it into a water-cooled splint copper mold after the raw material is completely melted into a liquid to obtain an alloy ingot.

[0074]2) Hydrogen absorption and crushing: the alloy ingot is placed at 25°C and the hydrogen pressure is 0.4MPa to absorb hydrogen for 3 hours. The alloy ingot is hydrogen-absorbed and crushed after hydrogen absorption, and the crushed powder is not subjected to dehydrogenation treatment. , to obtain a hydrogen powder with a hydrogen content of about 3000ppm...

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Abstract

The invention relates to a preparation method for a rare earth cobalt-based material, and specifically a preparation method for a 2:17 type rare earth cobalt-based material, comprising the steps of (1) smelting and preparing an alloy ingot based on the proportion of elements, wherein the chemical atom stoichiometric equation of the alloy ingot is Sm1-xRx(Co1-a-b-cFeaCubZrc)z; R is any one or more of Ce, Pr, Nd, Gd, Tb, Dy, Ho or Er; x is greater than or equal to 0 and less than or equal to 0.5; a is greater than or equal to 0 and less than or equal to 0.5; b is greater than or equal to 0 and less than or equal to 0.15; c is greater than or equal to 0 and less than or equal to 0.04; and z is greater than or equal to 6.5 and less than or equal to 8.5; (2) performing hydrogen absorption on the alloy ingot at a hydrogen absorption temperature of 10-180 DEG C and at hydrogen pressure of 0.2-0.5MPa for 2-5h to obtain smashed hydrogen powder; (3) continuing to smash the smashed hydrogen powder by an airflow mill to obtain magnetic powder; and (4) performing orientation moulding, isostatic cool pressing, sintering and solid solution treatment and aging treatment on the magnetic powder in sequence to obtain the rare earth cobalt-based material.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a preparation method of a rare earth cobalt-based material with high efficiency. Background technique [0002] 2:17 series samarium cobalt rare earth permanent magnet is an excellent high temperature permanent magnet material. Due to its high Curie temperature (above 700°C), high coercive force (above 18kOe), good temperature stability, good corrosion resistance and oxidation resistance, the 2:17 series samarium cobalt rare earth permanent magnets can be used at high temperature and high stability The field of application plays an irreplaceable role. 2:17 series samarium cobalt rare earth permanent magnets have been widely used in military and aerospace fields. [0003] The traditional preparation method of 2:17 series samarium cobalt rare earth permanent magnets is: batching→smelting ingot casting→mechanical crushing→ball milling or jet mill→magnetic field o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F1/06C22C30/02C22C30/00C22C19/07C22C1/04B22F9/04C22F1/10C22F1/16
CPCB22F9/023B22F9/04C22C1/0441C22C19/07C22C30/00C22C30/02C22F1/10C22F1/16H01F1/0551H01F1/0553H01F1/0555
Inventor 李明刘壮刘雷薛智琴陈仁杰李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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