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FeZrNdYB nano block alloy having hard magnetism and method for preparing same

A nano-block, hard magnetic technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of amorphous limitation, achieve good hard magnetism, overcome the complex processing technology, and expand the application field

Inactive Publication Date: 2009-05-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, amorphous alloys prepared by rapid cooling require very high cooling rates (10 5 K / s or more), only very thin strips and filamentous amorphous alloys can be obtained, which limits the practical application of amorphous alloys.

Method used

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  • FeZrNdYB nano block alloy having hard magnetism and method for preparing same

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Embodiment 1

[0023] The composition (atomic percentage) of the hard magnetic FeZrNdYB nano-bulk alloy in this embodiment is: Fe 68%, Zr 2%, Nd 5%, Y 4%, B 21%. The preparation process and steps are as follows: prepare 20 grams of industrially pure metal raw materials Fe, Zr, Nd, Y and FeB alloy according to the FeZrNdYB nano-block alloy composition of this embodiment, and then use a vacuum non-consumable electric arc furnace under argon protection Carry out smelting, the smelting current density is 150A / cm 2 , the alloy was smelted repeatedly for 4 times; the copper mold negative pressure suction casting method was used to cast, and a bulk amorphous alloy with a size of 1mm×10mm×80mm was obtained. Put the above bulk amorphous alloy at 690°C with a vacuum of 4×10 -3 Under the condition of Pa, vacuum annealing is carried out, and the annealing time is 30 minutes, and finally the FeZrNdYB nanometer block alloy with excellent hard magnetic properties of the present invention is prepared.

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Embodiment 2

[0025] The composition (atomic percentage) of the hard magnetic FeZrNdYB nano-bulk alloy in this embodiment is: Fe 68%, Zr 2%, Nd 5%, Y 4%, B 21%. The preparation process and steps are as follows: prepare 20 grams of industrially pure metal raw materials Fe, Zr, Nd, Y and FeB alloy according to the FeZrNdYB nano-block alloy composition of this embodiment, and then use a vacuum non-consumable electric arc furnace under argon protection Carry out smelting, the smelting current density is 150A / cm 2 , the alloy was smelted repeatedly for 4 times; the copper mold negative pressure suction casting method was used to cast, and a bulk amorphous alloy with a size of 1mm×10mm×80mm was obtained. The above bulk amorphous alloy was heated at 860°C with a vacuum of 4×10 -3 Under the condition of Pa, vacuum annealing is carried out, and the annealing time is 30 minutes, and finally the FeZrNdYB nanometer block alloy with excellent hard magnetic properties of the present invention is prepare...

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Abstract

The present invention relates to a hard-magnetic FeZrNdYB nano bulk alloy with an alloying component (atomic percentage) as follows: Fe 56-76 percent, Zr 0.5-6 percent, Nd 2-10 percent, Y 2-8 percent and B 13-27 percent. The process is as follows: the raw materials are prepared according to the formulation and melted in a vacuumized non-consumable electroarc furnace under the protection of argon. The alloy is repeatedly melted, cast with a method of typpe matrix negative-pressure molding and a ferrous bulk amorphous alloy is obtained. The amorphous alloy is conducted with a vacuumized annealing treatment for 10-40 minutes at a temperature of 550-900 degrees Celsius system under a vacuum degree of 3 to 5 being multiply with 10-3Pa and thus a hard-magnetic FeZrNdYB nano bulk alloy is obtained with a crystal grain size of 20-70 nanometers. The maximum magnetic energy product of the alloy is 53 kilojoules per cubic meter.

Description

technical field [0001] The invention relates to a FeZrNdYB nano block alloy with hard magnetism, which belongs to the technical field of magnetic alloy materials and processing techniques. Background technique [0002] The earliest report on the successful preparation of amorphous alloys was in 1934, when Kramer obtained amorphous films by vapor deposition. In 1950, Brenner et al prepared Ni-P amorphous film by electrodeposition. In 1958, American physicist Turnbull and others discussed and determined the influence of liquid supercooling on the formation of glass state, which opened the prelude to the study of amorphous alloys. In the 1960s, an important breakthrough was made in the study of amorphous alloys. In 1960, Duwez et al. of California Institute of Technology first prepared Au-Si amorphous alloy by rapid cooling of the melt (quick cooling method). Since then, the research on amorphous alloys has made great progress. However, amorphous alloys prepared by rapid co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/02H01F1/058C22C33/04B22D18/00C21D1/26
Inventor 谭晓华徐晖白琴蒙韬
Owner SHANGHAI UNIV
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