Iron-based bulk amorphous alloy having hard magnetism and method for preparing same

An amorphous alloy and hard magnetic technology, applied in the field of iron-based bulk amorphous alloy, can solve the problem of low saturation magnetization, achieve large coercive force, simple process, and expand the application field

Inactive Publication Date: 2008-11-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the saturation magnetization of Nd-based bulk amorphous is very low, which limits the application to a certain extent.

Method used

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  • Iron-based bulk amorphous alloy having hard magnetism and method for preparing same

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Embodiment 1

[0025] The composition (atomic percentage content) of the iron-based bulk amorphous alloy with hard magnetic properties in this embodiment is: Fe 52%, Nd 37%, Al 6%, B 4%, Dy 1%. The preparation process and steps are as follows: prepare 20 grams of industrial pure metal raw materials Fe, Nd, Al, Dy and FeB alloy according to the Fe-based bulk amorphous alloy composition of this embodiment, and then use a vacuum non-consumable electric arc furnace in an argon gas. Smelting under protection, the smelting current density is 150A / cm 2 , the smelted alloy was turned over and smelted 4 times; cast by the copper mold negative pressure suction casting method to obtain a bulk amorphous alloy with a size of 1 mm × 10 mm × 80 mm.

[0026] The magnetic properties of the iron-based bulk amorphous alloy prepared in this example at room temperature are shown in the appendix figure 1 . It can be seen from the accompanying drawings that the coercive force jHc≈500kA / m of the iron-based bulk a...

Embodiment 2

[0028] The composition (atomic percentage content) of the iron-based bulk amorphous alloy with hard magnetic properties in this embodiment is: Fe 57%, Nd 30%, Al 4%, B 6%, Dy 3%. The preparation process and steps are as follows: prepare 30 grams of industrial pure metal raw materials Fe, Nd, Al, Dy and FeB alloy according to the Fe-based bulk amorphous alloy composition of this embodiment, and then use a vacuum non-consumable electric arc furnace in an argon gas. Smelting under protection, the smelting current density is 200A / cm 2 , the smelted alloy was turned over and smelted 4 times; cast by the copper mold negative pressure suction casting method to obtain a bulk amorphous alloy with a size of 1 mm × 10 mm × 80 mm.

[0029] The coercive force jHc≈436kA / m of the iron-based bulk amorphous alloy prepared in this example is much better than the coercive force of the iron-based bulk amorphous alloy reported in the prior art.

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Abstract

The invention discloses a non-crystal alloy of ferric block with hard magnetism, which comprises the following parts: 40-63% Fe, 30-37% Nd, 4-10% Al, 2-8% B and 0.5- 6% Dy. The making method comprises the following steps: (1) allocating raw material according to formula; fusing with current density at 100-220A / cm2; turning over mother alloy for several times; (2) casting through copper mould suction adsorbing method; obtaining the product with higher coercitive force to 500kA / m.

Description

technical field [0001] The invention relates to an iron-based bulk amorphous alloy with hard magnetic properties, which belongs to the technical field of magnetic alloy materials. Background technique [0002] Since Duwez et al. first used the spray gun method to obtain amorphous Au in 1960 70 Si 30 Since alloying, amorphous alloys have made great progress in theoretical research and engineering applications. In the early stage of development, amorphous alloys need to be obtained by the method of rapid melt quenching. Because of the very high cooling rate required (10 5 K / s above), the three-dimensional size of amorphous alloys is greatly limited, and only very thin or very thin sheets, wires and powdered amorphous alloys can be obtained. This limits the practical application of amorphous materials. [0003] In order to overcome the limitations of the shape and size of amorphous alloy materials, people have made unremitting efforts to prepare bulk amorphous alloys in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/02C22C33/04B22D18/06C22C1/02
Inventor 白琴徐晖蒙韬谭晓华赵文君吴胜军张士岩王海龙蔡平平
Owner SHANGHAI UNIV
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