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Ternary antioxidant and application thereof

An antioxidant and application technology, applied in the field of ternary antioxidants and the preparation of NdFeB magnetic materials, can solve the problems of low coercive force and magnetic energy product, and achieve the improvement of pressing density, slow down oxidation, and reduce production costs. Effect

Active Publication Date: 2014-06-04
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anti-oxidation organic auxiliary agent provided by CN 101429030A can realize the compression of ordinary grades of NdFeB magnets under low concentration nitrogen or air atmosphere, but for the production of high-performance NdFeB magnets, such as the production of N55 grade magnets, coercive force and magnetic energy product are low

Method used

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  • Ternary antioxidant and application thereof
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  • Ternary antioxidant and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The effects of one-component antioxidant (amino antioxidant), binary antioxidant (amino + phenolic antioxidant) and ternary antioxidant (amino + phenolic + ascorbic acid antioxidant) on the preparation of NdFeB magnets were compared.

[0029] N48, N52 and N55 NdFeB magnets were prepared by sintering method, and nitrogen was used as the protective atmosphere. Add the antioxidant of the present invention respectively in the mixing stage, stir it into the NdFeB powder, mix and spray, and stir until the mixture is uniform; after the blank pressing stage, the antioxidant is removed. Among them, the monovalent antioxidant is nonylated diphenylamine; the composition of the binary antioxidant is: 70% by volume of nonylated diphenylamine and 30% by volume of tert-butyl hydroquinone; the composition of the ternary antioxidant is: 70% by volume of nonylated Diphenylamine, 25% by volume tert-butylhydroquinone and 5% by volume ascorbic acid. The experimental results are shown in Ta...

Embodiment 2

[0040] Preparation of brand N30AH NdFeB magnets by sintering method

[0041] N30AH NdFeB magnets were prepared by sintering method, and nitrogen was used as the protective atmosphere. Three samples were prepared by this method.

[0042] The process is the same as the preparation process of the above-mentioned sintering method, but the ternary antioxidant of the present invention is added in the mixing stage (the specific composition is: 40 volume % 1-phenylbutylamine, 2 volume % ascorbic acid and 58 volume % catechol) , Stir it into the NdFeB powder, mix and spray while mixing, and stir until the mixture is uniform; after the blank pressing stage, the antioxidant is removed. Three samples were prepared by this method.

[0043] The magnetic properties of the 38M NdFeB magnets prepared by the above two methods were tested, and the results are shown in Table 3.

[0044] Table 3 Performance test results of N30AH brand magnets prepared by different methods

[0045]

[0046] ...

Embodiment 3

[0048] Preparation of brand N50M NdFeB magnets by sintering method

[0049] N50M NdFeB magnets were prepared by sintering method, and nitrogen was used as the protective atmosphere. Eight samples were prepared by this method.

[0050] The process is the same as the preparation process of the above-mentioned sintering method, but the ternary antioxidant of the present invention (concrete composition: 55 volume percent diphenylamine, 4 volume percent ascorbic acid and 41 volume percent glycerol) is added in the mixing stage, and it is injected into In the NdFeB powder, it is mixed and sprayed until the mixture is completely uniform; after the blank pressing stage, the antioxidant is removed. Three samples were prepared by this method.

[0051] The magnetic properties of the N50M NdFeB magnets prepared by the above two methods were tested, and the results are shown in Table 4.

[0052] Table 4 High-performance magnet N50M magnet performance table

[0053]

[0054] It can b...

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Abstract

The invention provides a ternary antioxidant. The ternary antioxidant comprises 35-70% by volume of amine compound, 1-5% by volume of ascorbic acid and the balance of phenol or hydroxyl compound. The stable production of high-performance neodymium-iron-boron magnets can be realized by using the ternary antioxidant provided by the invention.

Description

technical field [0001] The invention relates to a ternary antioxidant and its application in preparing neodymium-iron-boron magnetic materials. Background technique [0002] Neodymium iron boron (Nd-Fe-B) magnet is currently the most important magnetic material. In 2010, the domestic annual output has reached more than 50,000 tons. It is widely used in computer, communication, energy, transportation, automobile, oil extraction, military and other industries. fields have been widely applied. [0003] The sintering method is currently a main process method for preparing NdFeB magnets, including the process stages of material mixing, blank pressing, sintering and molding. Different brands of NdFeB magnets can be prepared by this method, and the common raw material is NdFeB metal fine powder. Fine metal powder is easy to oxidize or spontaneously ignite under the condition of oxygen atmosphere, which will greatly reduce the remanence, magnetic energy product and coercive force ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K15/30C09K15/18C09K15/08C09K15/06B22F3/16
Inventor 舒康颖史宏声秦来顺沈杭燕范美强陈达田光磊白丽群
Owner CHINA JILIANG UNIV