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Fe-based composite particle temperature-resisting absorbent and preparing method thereof

A technology of composite particles and absorbents, applied in metal processing equipment, electrical components, transportation and packaging, etc., can solve the problem of affecting the electromagnetic parameters and absorbing performance of nanocrystalline carbonyl iron powder, and cannot realize the grain structure of nanocrystalline carbonyl iron powder Stability, grain growth and other issues, to achieve stable grain size, good temperature resistance, and improve the effect of temperature resistance

Inactive Publication Date: 2019-11-05
AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because nanocrystalline carbonyl iron powder is in a metastable state, it is prone to grain growth when subjected to high temperature, which may affect the electromagnetic parameters and microwave absorption properties of nanocrystalline carbonyl iron powder. Therefore, only by chemical Coating, the stability of the grain structure of nanocrystalline carbonyl iron powder cannot be achieved

Method used

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  • Fe-based composite particle temperature-resisting absorbent and preparing method thereof
  • Fe-based composite particle temperature-resisting absorbent and preparing method thereof
  • Fe-based composite particle temperature-resisting absorbent and preparing method thereof

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Embodiment 1

[0037] The Fe-based composite particle temperature-resistant absorbent of this embodiment is composed of 0.9 kg of carbonyl iron powder and 0.1 kg of Si powder; wherein: the carbonyl iron powder is a spherical particle with a smooth appearance and a particle size of 2-5 μm; The phase composition of the carbonyl iron powder is that the α iron phase is uniformly distributed; the particle size of the Si powder is 50-1000 mesh.

[0038] The above-mentioned Fe-based composite particle temperature-resistant absorbent in this embodiment is prepared by the following method, which specifically includes the following steps:

[0039] Accurately weigh 0.9kg of carbonyl iron powder and 0.1kg of Si powder, totaling 1kg; weigh 15kg of 10mm and 6mm stainless steel balls, the mass ratio of the two is 3:2. Put the above-mentioned raw materials into the ball mill tank, and after it is sealed, pass in high-purity Ar gas at a rate of 1.5L / min for 35min. After the ventilation is completed, tighten the ...

Embodiment 2

[0046] The Fe-based composite particle temperature-resistant absorbent of this embodiment is composed of 0.8 kg of carbonyl iron powder and 0.2 kg of Si powder; wherein: the carbonyl iron powder is a spherical particle with a smooth appearance and a particle size of 2-5 μm; The phase composition of the carbonyl iron powder is that the α iron phase is uniformly distributed; the particle size of the Si powder is 50-1000 mesh.

[0047] The above-mentioned Fe-based composite particle temperature-resistant absorbent in this embodiment is prepared by the following method, which specifically includes the following steps:

[0048] Accurately weigh 0.8kg of carbonyl iron powder and 0.2kg of Si powder totaling 1kg; weigh 20kg of 10mm and 6mm stainless steel balls, the mass ratio of the two is 3:2. Put the above-mentioned raw materials into the ball mill tank, and after it is sealed, pass in high-purity Ar gas at a rate of 1.5L / min for 35min. After the ventilation is completed, tighten the s...

Embodiment 3

[0055] The difference between this embodiment and embodiment 1 is that the Fe-based composite particle temperature-resistant absorbent of this embodiment is composed of 0.95 kg of carbonyl iron powder and 0.05 kg of Si powder.

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Abstract

The invention discloses a Fe-based composite particle temperature-resisting absorbent. The raw material of the Fe-based composite particle temperature-resisting absorbent comprises carbonyl iron powder and Si powder, and Fe-based composite particles are formed by carbonyl iron powder and Si powder through a high-energy ball milling manner, the grain structure of the Fe-based composite particles isthe alpha-Fe phase, and the grain size is in the range of 10 to 11 nm. Si elements are evenly distributed in a base body of the carbonyl iron powder, after one-hour heat treatment of 500 DEG C, the grain size and electromagnetic parameters of the composite particles are basically kept unchangeable, and the good temperature resistance is achieved. The method is simple in preparing process, the problem that grains of the magnetic temperature-resisting absorbent grow is solved, and the method has the important significance in development of the temperature-resisting wave-absorbing material.

Description

Technical field [0001] The invention belongs to the field of electronic materials, and specifically relates to an absorbent with thermal stability. Background technique [0002] The discovery and application of electromagnetic waves have greatly promoted the development of military technology. People use electromagnetic waves to detect aircraft and shipborne weapons to achieve the purpose of strategic defense. In order to prevent the aircraft from being detected by radar during flight, microwave absorbing materials have become the key objects of military research in various countries. Microwave absorbing materials, also known as absorbing materials, are widely used in military stealth, electromagnetic shielding and human safety protection because they can absorb and attenuate incident electromagnetic waves and convert them into heat energy for loss. [0003] In order to meet the requirements of rapid strikes, the next generation of aircraft will have faster speeds. During the fli...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/04H05K9/00
CPCB22F1/0003B22F9/04H05K9/0081B22F2009/043B22F2999/00B22F1/14B22F2201/10
Inventor 王彦淇龙昌丁铁伢王浩继陈路
Owner AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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