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Anisotropic high-frequency microwave magnetic material and preparation method thereof

An anisotropic magnetic and magnetic material technology, applied in the field of easy-face anisotropic rare earth intermetallic compound high-frequency microwave magnetic materials and their preparation, to achieve excellent high-frequency microwave magnetic effects

Active Publication Date: 2016-01-27
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the easy-faced rare earth intermetallic compounds or dual-phase nanocrystalline materials with high resonance frequency, because the particles are isotropic samples, it is impossible to obtain high-frequency microwave magnetic materials with better performance through magnetic field rotation orientation.

Method used

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  • Anisotropic high-frequency microwave magnetic material and preparation method thereof
  • Anisotropic high-frequency microwave magnetic material and preparation method thereof
  • Anisotropic high-frequency microwave magnetic material and preparation method thereof

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preparation example Construction

[0035] The invention provides a method for preparing an anisotropic rare earth intermetallic compound high-frequency microwave magnetic material, which comprises the following steps:

[0036] (1) Raw material preparation: mix rare earth metals, iron and boron-iron alloys by R x Fe 100-x-y B y (at%) ratio; wherein, 11.76<x≤15, 5.88≤y≤7.0, R is one of Sm, Er, Tm;

[0037] (2) Smelting: Under the protection of argon, melt the raw materials in the ratio of step (1) at 1480-1580°C to form ingots, and cool them; the ingots are smelted repeatedly for 3-5 times, so that the alloy composition is single and uniform; Alloys can be completely crystalline or partially amorphous, with a grain size of less than 500nm

[0038] (3) Swinging belt: The ingot smelted in step (2) is prepared into an amorphous or nanocrystalline quick-quenching belt by means of rapid quenching of the melt. The melting temperature is 1400°C-1500°C, and the water-cooled copper rod or The linear speed of the molyb...

Embodiment 1

[0046] Example 1-Sm 12 Fe 82.12 B 5.88

[0047] (1) Raw material preparation: according to the design composition Sm 12 Fe 82.12 B 5.88 Proportioning the rare earth metal Sm, iron and boron-iron alloy;

[0048] (2) Melting: under the protection of argon, melt the raw materials with good proportions at 1480°C to form ingots, and the ingots are smelted repeatedly for 3 times, so that the alloy composition is single and uniform; the grain size of the alloy is less than 500nm;

[0049] (3) Swinging belt: the ingot is prepared into an amorphous or nanocrystalline quick-quenching belt by means of rapid quenching of the melt, the melting temperature is 1400 ° C, and the linear velocity of the water-cooled copper rod rotating at high speed is 25 m / s;

[0050] (4) Coarse crushing: manually grind the quick-quenching belt to a particle size of less than 100 μm;

[0051] (5) Hot pressing: filled with argon gas after high vacuum, the vacuum degree is greater than 1×10 -2 Pa, the co...

Embodiment 2

[0054] Embodiment 2-Er 15 Fe 78 B 7.0

[0055] (1) Raw material preparation: according to the design composition Er 15 Fe 78 B 7.0 Rare earth metal Er, iron and boron ferroalloy are mixed;

[0056] (2) Melting: Under the protection of argon, melt the raw materials with a good ratio at 1580°C to form an ingot, and the ingot is smelted repeatedly for 5 times, so that the alloy composition is single and uniform; the alloy grain size is less than 500nm;

[0057] (3) Throwing strip: the ingot is prepared into an amorphous thin strip by the method of rapid quenching of the melt, the melting temperature is 1500 °C, the linear speed of the high-speed rotating water-cooled molybdenum roller is 45m / s, and the appearance of the rapid quenching strip is as follows Figure 4 shown;

[0058] (4) Coarse crushing: manually grind the quick-quenching belt to a particle size of less than 100 μm;

[0059] (5) Hot pressing: filled with argon gas after high vacuum, the vacuum degree is grea...

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Abstract

The invention belongs to the field of magnetic materials, and particularly to an anisotropic high-frequency microwave magnetic material and a preparation method thereof. The chemical formula of the magnetic material is RxFe100-x-yBy (at%), wherein 11.76<x<=15, 5.88<=y<=7.0, and R is selected from Sm, Er and Tm. The magnetic material has magnetic crystal anisotropy, wherein an easily magnetized surface is vertical with a C axis. The magnetic material is prepared through processes of melting, preparing to a belt, rough crushing, hot pressing, heat deforming and crushing. The anisotropic high-frequency microwave magnetic material which is made of one compound of a metal selected from rare earth intermetallics according to the invention realizes superposing of a magnetic crystal anisotropic field and a shape anisotropic field, so that the material has better high-frequency characteristic.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a high-frequency microwave magnetic material of an anisotropic rare-earth intermetallic compound and a preparation method thereof. Background technique [0002] In recent years, electromagnetic devices have been widely used in military and civilian equipment (radar, radio communication technology, local area network system, personal electronic notebook, etc.). At present, its application frequency has reached GHz. With the increasing application of high-frequency electromagnetic devices, electromagnetic interference as a new special environmental pollution has received more and more attention. Therefore, the research and development of GHz frequency band has high Electromagnetic wave absorbing materials with complex permeability have become a top priority. [0003] The widely used microwave absorbing material is planar hexagonal structure ferrite. Due to the low ani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F9/04B22F1/00B22F3/14
Inventor 韩瑞李卫朱明刚周栋李发伸
Owner CENT IRON & STEEL RES INST
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