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A nanometer crystal composite permanent-magnet alloy and a preparation method thereof

A technology of nanocrystalline composite and permanent magnetic alloy, which is applied in the direction of magnetic materials, manufacturing tools, magnetic objects, etc., can solve the problems of complex process, high cost, and difficulty in continuously improving the magnetic properties of alloys, and achieve low cost, convenient operation, and improved The effect of maximum energy product

Inactive Publication Date: 2009-03-04
SHANGHAI UNIV
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Problems solved by technology

[0006] Through the above introduction, it can be found that it is difficult to continue to improve the magnetic properties of the alloy by using the conventional annealing process. At the same time, some other new annealing processes are difficult to be popularized and applied to industrial production due to high cost and complicated process. Therefore, there is an urgent need for a A low-cost, easy-to-operate annealing method

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  • A nanometer crystal composite permanent-magnet alloy and a preparation method thereof

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Embodiment 1

[0026] The composition (atomic percentage) of the nanocrystalline composite permanent magnet alloy of this embodiment is: Nd 8.5%, Fe 77%, Co 5%, Zr 2.7%, Ga 0.6%, B 6.2%. The preparation process and steps are as follows: 15 grams of industrially pure metal raw materials Nd, Fe, Co, Zr, Ga and FeB alloy are prepared according to the composition of the nanocrystalline composite permanent magnetic alloy of the present embodiment, and then are heated in argon with a vacuum non-consumable electric arc furnace. Melting is carried out under gas protection, and the melting current density is 200A / cm 2 , the smelted alloy was turned over and smelted 5 times; the quick-quenched thin strip of the alloy was obtained by the melt quick-quenching method, and the linear speed of the roller was 15m / s; -3 Under the condition of Pa, pulse magnetic field annealing is carried out, the annealing time is 18min, the frequency of the external pulse magnetic field is 0.05Hz, and the magnetic field str...

Embodiment 2

[0029] The composition (atomic percentage) of the nanocrystalline composite permanent magnet alloy of this embodiment is: Nd 9.5%, Fe 75.8%, Co 5%, Zr 3%, Ga 0.2%, B 6.5%. The preparation process and steps are as follows: prepare 20 grams of industrial pure metal raw materials Nd, Fe, Co, Zr, Ga and FeB alloy according to the composition of the nanocrystalline composite permanent magnetic alloy of this embodiment, and then use a vacuum non-consumable electric arc furnace in an argon Melting is carried out under gas protection, and the melting current density is 220A / cm 2 , the smelted alloy was turned over and smelted 4 times; the quick-quenched thin strip of the alloy was obtained by the melt quick-quenching method, and the linear speed of the roller was 12m / s; -3 Under the condition of Pa, pulse magnetic field annealing is carried out, the annealing time is 23 minutes, the frequency of the external pulse magnetic field is 0.05 Hz, and the magnetic field strength is 3T, and f...

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Abstract

The invention relates to a nano-crystal composite permanent magnetic alloys and the method for preparing the same. The nano-crystal composite permanent magnetic alloys comprise( atom percent ): Nd7-11%, Fe70-82%, Co2-8%, Zr1-4%, Ga0.1- 1.5%, B4-8%. The method comprises following steps: (1) batching according to alloy formulation above, fusing by using vacuum non-consumable electrode arc furnace under argon gas protection, fusing the master alloy turnover and repeatedly; (2) getting the melt-spun ribbons of nano-crystal composite permanent magnetic alloys in vacuum induction extracting cage; (3) placing the alloy ribbons in a external pulsed magnetic field with frequency being 0.02-0.05Hz, magnetic field 1-6T, vacuum annealing at 200-400 Deg. C. The invention is characterized in that the coercivity and remanence of nano-crystal composite permanent magnetic alloys are increased after annealing in external pulsed magnetic field, and the maximum magnetic energy product of alloy is increased by 24.8% compared to that of in conventional process.

Description

technical field [0001] The invention relates to a nanocrystalline composite permanent magnet alloy and a preparation method thereof, belonging to the technical field of magnetic materials and processing techniques. Background technique [0002] Nanocrystalline composite permanent magnetic alloy is a new type of permanent magnetic material, which is a permanent magnetic material composed of soft magnetic phase and hard magnetic phase in the nanometer range. Due to its low rare earth content, high theoretical magnetic energy product and attractive commercial prospects, this material has attracted great attention from many researchers. [0003] Since 1989, R. Coehoon et al first developed Nd by melt quenching method. 4.5 Fe 78 B 18.5 Since the development of nanocomposite permanent magnet materials, researchers at home and abroad have successively developed mechanical alloying, magnetron sputtering and HDDR methods to develop nanocomposite permanent magnet materials. Becaus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14H01F1/055C22C33/04B22D11/01C21D9/52C21D10/00C21D1/26
Inventor 张士岩徐晖谭晓华倪建森候雪玲白琴董远达
Owner SHANGHAI UNIV
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