Method for producing R-Fe-B permanent magnet, and lubricating agent for use in shaping the same

一种模压加工、润滑剂的技术，应用在磁性物体、金属加工设备、磁性材料等方向，能够解决差生产率、磁体性能降低、很难除去粘结剂和模制品强度等问题

Inactive Publication Date: 2006-12-06
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method using the above-mentioned lubricant faces problems in that it is difficult to remove the binder and the strength of the molded product is poor, resulting in poor productivity
[0013] Moreover, in order to improve the moldability, it is recommended to add a binder with excellent adhesion such as PVA (polyvinyl alcohol) etc. during the granulation of the magnet powder, however, the removal of the binder during the sintering process encounters various problems. This kind of problem, but also the following problem: Special handling such as in H 2 Sintering in a reducing atmosphere, etc. will be necessary, as the amount of C remaining in the sintered body increases, the magnet performance will decrease, etc.

Method used

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  • Method for producing R-Fe-B permanent magnet, and lubricating agent for use in shaping the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Electrolytic iron with a purity of 99.9%, an iron-boron alloy containing 19.8% by weight of B, and Nd and Dy with a purity of 99.7% or higher are used as starting alloys. They are mixed at high frequency and then melted. They were cast into a mold with a water-cooled casting mold to obtain a billet with a composition of 14.5at%Nd-0.5at%Dy-78.8at%Fe-6.2at%B.

[0066] Then the above-mentioned billet is crushed by a hammer mill, and further crushed under the protection of a hydrogen atmosphere to obtain crushed powder with an average particle size of 40 μm. The obtained crushed powder passes at 6kg / mm 2 Under the condition of gas pressure and using inert gas (nitrogen), it is pulverized by a jet mill to obtain fine powder with an average particle diameter of 3 μm.

[0067] Methyl caproate lubricant (boiling point: 150°C, effective ingredient: 10%, Paresu Kagaku Co., Ltd., Magrupu PS-A-21) and methyl caprylate lubricant (boiling point: 150°C, effective ingredient: 10%, Paresu K...

Embodiment 2

[0075] Electrolytic iron with a purity of 99.9%, an iron-boron alloy containing 19.89% by weight of B, and Nd and Dy with a purity of 99.7% or higher were used as starting alloys. They are mixed and melted at high frequency, and then they are cast into a mold with a water-cooled casting mold to obtain a composition of 13.4at%Nd-2.6at%Dy-77.8at%Fe-6.2at%B Blank.

[0076] Then, the above-mentioned billet was crushed by a hammer mill, and further dissociated under the protection of a hydrogen atmosphere to obtain crushed powder with an average particle size of 40 μm. The obtained crushed powder passes at 6kg / mm 2 Under the condition of gas pressure and using inert gas (nitrogen), it is pulverized by a jet mill to obtain fine powder with an average particle diameter of 3 μm.

[0077] As a depolymerized polymer, a copolymer with a molecular weight of 550 composed of isobutylene and n-butene, and a low-viscosity mineral oil with a dynamic viscosity of 5 mm at 40°C 2 / s pure paraffinic m...

Embodiment 3

[0096] Electrolytic iron with a purity of 99.9%, an iron-boron alloy containing 19.8% by weight of B, and Nd and Dy with a purity of 99.7% or higher are used as starting alloys. They are mixed and melted at high frequency, and then cast into a mold with a water-cooled casting mold to obtain a billet with a composition of 13.4at%Nd-2.6at%Dy-77.8at%Fe-6.2at%B.

[0097] Then the above-mentioned billet was crushed by a hammer mill, and further crushed by hydrogen atmosphere protection to obtain crushed powder with an average particle size of 40 μm. The obtained crushed powder passes at 6kg / mm 2 Under the condition of gas pressure and using nitrogen as an inert gas, it is pulverized by a jet mill to obtain a fine powder with an average particle size of 3 μm.

[0098] The mixture of various lubricants 1, 2 was added to the obtained fine R-Fe-B crushed powder and mixed, as shown in Table 10. Methyl caproate and methyl caprylate or Ti coupling agent (boiling point: 200°C or higher, effect...

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Abstract

The invention relates to a method for producing an R-Fe-B permanent magnet, wherein, R refers to lanthanon. The method comprises the steps as follow: 0.01 to 10.0 wt% of lubricant for pressing a mould, which has an uncoiled polymer, is added into and mixed with the R-Fe-B alloy powders; and then the mixture is pressed through a module in a magnetic field and then is sintered, wherein, the quality percent is calculated based on the quality of the R-Fe-B alloy powders. The invention also relates to a lubricant for module-pressing the magnet.

Description

[0001] This application is a divisional application. The filing date of the parent application is April 22, 1999, the application number is 99800866.4, and the title of the invention is "Method for Producing R-Fe-B Magnets and Lubricants for Molding and Processing the Magnets" ". Technical field [0002] The present invention relates to a method for producing R-Fe-B permanent magnets. With this method, high crystal orientation can be obtained and the molded product has high strength, so the productivity is excellent. The present invention relates to a method for producing R-Fe-B magnets, in which high crystal orientation is obtained, the strength of molded products is significantly improved, and R-Fe-B magnets with high Br can be mass-produced with good yield. Yes: by adding and mixing a lubricant for molding and processing magnets, it is characterized by adding a specific amount of methyl caproate and / or methyl octoate (with which high crystal orientation can be obtained), and con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F3/12B22F1/10
CPCB22F1/0059H01F1/0577B22F1/10
Inventor 金子裕治马场顺一郎田中和雄森静男
Owner PROTERIAL LTD
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