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Novel (FeCo)B microwave absorbing material

A technology of microwave-absorbing materials and alloys, applied in radiation-absorbing coatings, shielding, instruments, etc., can solve problems such as inability to apply high temperature ranges, and achieve the effect of wide application prospects

Inactive Publication Date: 2014-11-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The absorbing material prepared by this method has good absorbing performance at 2-5 GHz, and its Curie temperature is higher than that of ferrite materials, but it cannot be applied in the high temperature range.

Method used

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  • Novel (FeCo)B microwave absorbing material
  • Novel (FeCo)B microwave absorbing material
  • Novel (FeCo)B microwave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Electric pure iron, electrolytic cobalt and FeB alloy are used as raw materials, and the mass fractions of Fe, Co and B are 47.4%, 52.0% and 0.60% respectively. Melting is carried out in a high-frequency vacuum induction furnace. The vacuum induction furnace adopts a MgO crucible, and the furnace is washed with pure Fe before melting. The refining temperature is 1500°C-1600°C, and the refining time is 3min-5min. The (FeCo)B alloy with uniform composition is obtained by casting. Ingot; using a vacuum quenching furnace, the (FeCo)B alloy was rapidly quenched under the protection of argon by the melt overflow method to prepare thin strips. The linear speed of the cooling roll was 30m / s, and the vacuum degree was 1×10 -3Pa, prepare a thin strip with a thickness of less than 15 μm; use a fast powder compactor to make the thin strip into a powder with a particle size of 100-150 μm, and the processing time is 0.15h; use a high-energy ball mill to mechanically grind the powder, ...

Embodiment 2

[0037] Electric pure iron, electrolytic cobalt and FeB alloy are used as raw materials, and the mass fractions of Fe, Co and B are 48.3%, 51.0% and 0.70% respectively. Melting is carried out in a high-frequency vacuum induction furnace. The vacuum induction furnace adopts a MgO crucible, and the furnace is washed with pure Fe before melting. The refining temperature is 1500°C-1600°C, and the refining time is 3min-5min. The (FeCo)B alloy with uniform composition is obtained by casting. Ingot; using a vacuum quenching furnace, the (FeCo)B alloy was rapidly quenched under the protection of argon by the melt overflow method to prepare thin strips. The linear speed of the cooling roll was 40m / s, and the vacuum degree was 1×10 -3 Pa, prepare a thin strip with a thickness of less than 15 μm; use a fast powder compactor to make the thin strip into a powder with a particle size of 100-150 μm, and the processing time is 0.15h; use a high-energy ball mill to mechanically grind the powder,...

Embodiment 3

[0040] Electric pure iron, electrolytic cobalt and FeB alloy are used as raw materials, and the mass fractions of Fe, Co and B are 49.2%, 50.0% and 0.80% respectively. Melting is carried out in a high-frequency vacuum induction furnace. The vacuum induction furnace adopts a MgO crucible, and the furnace is washed with pure Fe before melting. The refining temperature is 1500°C-1600°C, and the refining time is 3min-5min. The (FeCo)B alloy with uniform composition is obtained by casting. Ingot; using a vacuum quenching furnace, the (FeCo)B alloy was rapidly quenched under the protection of argon by the melt overflow method to prepare thin strips. The linear speed of the cooling roll was 40m / s, and the vacuum degree was 2×10 -3 Pa, prepare a thin strip with a thickness of less than 15 μm; use a fast powder compactor to make the thin strip into a powder with a particle size of 100-150 μm, and the processing time is 0.15h; use a high-energy ball mill to mechanically grind the powder,...

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Abstract

The invention discloses a novel (FeCo)B microwave absorbing material and relates to a new material used for absorbing electromagnetic waves and a preparation method of the novel (FeCo)B microwave absorbing material. The (FeCo)B microwave absorbing material comprises, by mass fraction, 47.0-50.0% of Fe, 50.0-53.0% of Co and 0.6-0.9% of B in 100%. The preparation method includes steps of (1), preparing (FeCo)B alloy ingot uniform in components by means of vacuum induction smelting; (2), rapidly quenching by means of melt overflow method to prepare a thin belt with the thickness smaller than 15 micrometers; (3), manufacturing the thin belt into powder with grain diameter of 100-150 micrometers for 0.1-0.2 hour; and (4), mechanically grinding the powder, wherein the linear velocity of a cooling roller is 30-50m / s, vacuum degree ranges from 1-2X10<-3>Pa, ratio of grinding powder to the material is 40:1, and ball grinding time ranges from 6-12 hours. The novel (FeCo)B microwave absorbing material and the preparation method thereof have the advantages that at low frequency ranging from 2-8GHz, the novel (FeCo)B microwave absorbing material having higher magnetic conductivity and magnetic loss, Curie temperature higher than 800 DEG C and the thickness of 1.8mm has microwave absorbing performance which can be up to -11.5dB, and is wide in application prospect at high-temperature low frequency.

Description

technical field [0001] The invention provides a novel (FeCo)B microwave absorbing material, relates to a new material and method for absorbing electromagnetic microwaves, has excellent microwave absorbing performance in the 2-8GHz frequency range, and has It has wide application prospects and belongs to the field of microwave absorption. Background technique [0002] With the rapid development of modern science and technology, especially the electronic industry technology, electromagnetic radiation is constantly flooding people's living space, causing serious electromagnetic pollution, which has attracted the attention of all countries in the world. In the 21st century, electromagnetic wave pollution will become the leading physical pollution of the ecological environment. In terms of military affairs, with the extensive application of modern detection and guidance technologies such as radar, millimeter wave, infrared, laser, multispectral and sound waves in weapon systems,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/07C09D5/32H05K9/00G12B17/02
Inventor 张深根田建军潘德安朱行欣
Owner UNIV OF SCI & TECH BEIJING