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A kind of hea-sic high temperature wave-absorbing material and preparation method thereof

A wave absorbing material, high temperature technology, applied in the fields of magnetic/electric field shielding, antennas, electrical components, etc., can solve the problem of material wave absorbing stealth degradation and other problems, achieve outstanding anti-oxidation ability, good controllability of process parameters, easy to implement Effect

Active Publication Date: 2022-05-17
AIR FORCE UNIV PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composite system in which the metal is discretely distributed in the oxide will inevitably undergo a strong oxidation reaction at high temperature, which will lead to the degradation of the absorbing stealth function of the material.

Method used

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  • A kind of hea-sic high temperature wave-absorbing material and preparation method thereof

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Effect test

Embodiment 1

[0026] A preparation method of the FeCoNiMo-SiC high temperature resistant wave-absorbing material of this embodiment, comprising the following steps:

[0027] (1) Preparation of FeCoNiMo powder: Fe, Co, Ni, and Mo powders with a commercially available purity of ≥99.5% and a particle size of 70 μm are subjected to high-energy ball milling in an equimolar ratio, the ball milling speed is 300 rpm, and the ball-to-material ratio is 7:1 , the single rotation during the ball milling process is limited to 30 minutes, and after stopping for 5 minutes, the ball milling is carried out in the form of reverse rotation. In this cycle, the total time of ball milling is 80 hours, and argon protection is implemented throughout the process.

[0028] (2) Ball milling and mixing FeCoNiMo-SiC composite powder: Weigh the FeCoNiMo powder obtained in step (1) respectively according to the mass fraction ratio of 35:55:10, commercially available SiC powder with a purity ≥ 99% and a particle size of 20...

Embodiment 2

[0032] A preparation method of the FeCoNiMoAlTiSi-SiC high temperature resistant wave-absorbing material of this embodiment, comprising the following steps:

[0033](1) Preparation of FeCoNiMoAlTiSi powder: the Fe, Co, Ni, Mo, Al, Ti, Si powders with a commercially available purity ≥ 99.5% and a particle size of 20 μm are subjected to high-energy ball milling in equimolar proportions, and the ball milling speed is 300 rpm. The material ratio is 15:1, and the single rotation during the ball milling process is limited to 30 minutes. After stopping for 10 minutes, the ball milling is carried out in the form of reverse rotation. In this cycle, the total time of ball milling is 10 hours, and the whole process is protected by argon.

[0034] (2) Ball milling and mixing FeCoNiMoAlTiSi-SiC composite powder: Weigh the FeCoNiMoAlTiSi powder obtained in step (1) according to the mass fraction ratio of 5:92:3, and commercially available SiC powder with a purity ≥ 99% and a particle size of...

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Abstract

The invention discloses a HEA-SiC high-temperature wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps: mixing ferromagnetic high-entropy alloy powder, SiC ceramics and sintering aids, and then sintering in stages under oxygen-free conditions, Obtain HEA-SiC high-temperature absorbing material. By mixing and sintering ferromagnetic HEA and SiC ceramics, it is not only beneficial to the low-temperature densification and sintering of SiC ceramics, but also can greatly reduce the specific gravity of existing ferromagnetic wave-absorbing materials. Both materials are excellent high-temperature structural materials. There is no obvious chemical reaction in the environment, and it has excellent characteristics such as high mechanical strength, good temperature resistance, and outstanding oxidation resistance. The material can not only enhance the absorption of electromagnetic waves by using multiple dissipation mechanisms such as conductance loss, dielectric loss and magnetic loss in the environment below the Curie point temperature of ferromagnetic metals, but also continue to use conductance loss and dielectric loss at high temperatures. To absorb electromagnetic waves, to ensure the wide temperature range of the material absorbing function.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a HEA-SiC high-temperature wave-absorbing material and a preparation method thereof. Background technique [0002] In order to improve the stealth ability of high-temperature components of equipment, high-temperature absorbing material technology is an important research direction in the development of aerospace equipment and advanced materials. [0003] According to the difference in the mechanism of electromagnetic wave absorption loss, wave absorbing materials can be divided into conductance loss type, dielectric loss type and magnetic loss type. Among them, magnetic loss only acts below the Curie temperature of the material, so high temperature wave absorbing materials often refer to conductance loss type and dielectric loss type materials. At present, conductance loss absorbing materials mainly refer to carbon-containing (C) materials, and dielectric loss absorb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/06C22C1/05C22C49/02C22C49/14C22C47/14B22F3/10B22F3/14H01Q17/00H05K9/00C22C101/14
CPCC22C29/065C22C29/067C22C1/051C22C49/02C22C49/14C22C47/14H01Q17/00H05K9/0083B22F3/1017B22F3/1007B22F3/14
Inventor 蒋进明王军王甲富王雯洁王爱霞屈绍波
Owner AIR FORCE UNIV PLA
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