Preparation method for high-flexibility samarium-cobalt permanent magnet

A permanent magnet, high toughness technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of weak mechanical properties of samarium cobalt permanent magnets

Active Publication Date: 2016-09-07
NINGBO NINGGANG PERMANENT MAGNETIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a high-toughness samarium-cobalt permanent magnet for the defect that the mechanical properties of the existing samarium-cobalt permanent magnet are not strong

Method used

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  • Preparation method for high-flexibility samarium-cobalt permanent magnet

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Embodiment 1

[0024] A method for preparing a high-toughness samarium-cobalt permanent magnet, comprising the following steps:

[0025] (1) The preparation raw material composition comprises: samarium is 26%wt, cobalt is 50%wt, copper is 5%wt, zirconium is 3%wt, iron is 16%wt;

[0026] (2) Place the prepared raw materials in a vacuum melting furnace, vacuumize the vacuum melting furnace to 4×10-2Pa, melt at a temperature of 1500° C. under the protection of argon to obtain a uniform alloy melt;

[0027] (3) cooling the molten alloy to 1300°C, and pouring it into the ingot mold cavity to obtain an ingot;

[0028] (4) the ingot is hydrogen broken to obtain the hydrogen broken product;

[0029] (5) Silver powder, a dispersant and an antioxidant with a particle size of 20 μm are added to the hydrogen incineration product in step (4), and then they are dropped into a jet mill, and high-purity nitrogen gas with a purity of 99.99% is used as a pulverizing gas to pulverize into a particle size of 3...

Embodiment 2

[0032] A method for preparing a high-toughness samarium-cobalt permanent magnet, comprising the following steps:

[0033] (1) The preparation raw material composition comprises: samarium is 27%wt, cobalt is 50%wt, copper is 5%wt, zirconium is 3%wt, iron is 15%wt;

[0034] (2) Place the prepared raw materials in a vacuum melting furnace, vacuumize the vacuum melting furnace to 5×10-2Pa, melt at a temperature of 1550° C. under the protection of argon to obtain a uniform alloy melt;

[0035] (3) cooling the molten alloy to 1350° C., pouring it into an ingot mold cavity to obtain an ingot;

[0036] (4) the ingot is hydrogen broken to obtain the hydrogen broken product;

[0037] (5) Adding silver powder, dispersant and antioxidant with a particle size of 30 μm to the hydrogen incineration product in step (4), then dropping into the jet mill, using high-purity nitrogen with a purity of 99.99% as the pulverizing gas, and pulverizing into a particle size of 4 μm The magnetic powder,...

Embodiment 3

[0040] A method for preparing a high-toughness samarium-cobalt permanent magnet, comprising the following steps:

[0041] (1) The preparation raw material composition comprises: samarium is 25%wt, cobalt is 49%wt, copper is 6%wt, zirconium is 3%wt, iron is 17%wt;

[0042] (2) Place the prepared raw materials in a vacuum melting furnace, vacuumize the vacuum melting furnace to 3 × 10-2Pa, and melt at a temperature of 1600°C under the protection of argon to obtain a uniform alloy melt;

[0043] (3) cooling the molten alloy to 1300° C., and pouring it into an ingot mold cavity to obtain an ingot;

[0044] (4) the ingot is hydrogen broken to obtain the hydrogen broken product;

[0045] (5) Silver powder, a dispersant and an antioxidant with a particle size of 40 μm are added to the hydrogen incineration product described in step (4), and then they are dropped into a jet mill, and high-purity nitrogen gas with a purity of 99.99% is used as a pulverizing gas to pulverize into a par...

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Abstract

The invention discloses a preparation method for a high-flexibility samarium-cobalt permanent magnet. The preparation method comprises the steps of preparing raw materials, carrying out vacuum melting, carrying out hydrogen demolishing, adding a small amount of silver, a dispersing agent and an antioxidant to a jet mill to be grinded, carrying out orientation and blank pressing, and sintering the blank to obtain the product. The samarium-cobalt permanent magnet prepared by the preparation method has obviously fine crystalline grains, so that it is ensured that the sintered crystalline grains are equal in size and uniform; and therefore, the fracture toughness property of the sintered permanent magnet is improved, particularly, the residual magnetism Br, the maximum magnetic energy product (BH)max and critical magnetic field Hk are improved.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnet materials, in particular to a high toughness samarium cobalt permanent magnet. Background technique [0002] Samarium cobalt magnets are the second generation of rare earth permanent magnets, mainly divided into 1:5 type (SmCo5) and 2:17 type (Sm2Co17). Its main features are high magnetic performance and good temperature performance. The maximum working temperature can reach 250-350 degrees Celsius. Compared with NdFeB magnets, SmCo magnets are more suitable for working in high temperature environments. It is very suitable for manufacturing various high-performance permanent magnet motors and application products with very complex working environments. In addition, the samarium cobalt magnet has strong anti-rust ability, and its surface generally does not need electroplating treatment. [0003] However, the mechanical properties of rare earth permanent magnet materials are generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F41/02C22C19/07C22C30/02C22C30/00B22F9/04
CPCB22F9/04B22F2009/045C22C19/07C22C30/00C22C30/02H01F1/0555H01F41/0266
Inventor 郭艳董建宏马汉云周建斌盛名忠吴承祖
Owner NINGBO NINGGANG PERMANENT MAGNETIC MATERIALS
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