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High-entropy wave-absorbing carbide ceramic powder material as well as preparation method and application thereof

A technology of ceramic powder and carbide, which is applied to high-entropy carbide ceramics with wide absorption band, preparation, high-entropy absorbing carbide ceramic powder material, high purity, and strong absorbing performance, which can solve the problem of narrow absorption band , low density, high temperature stability, and low absorption strength, etc., to achieve the effect of wide absorption frequency band, wide absorption frequency band, and strong wave absorption performance

Active Publication Date: 2021-02-09
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the proportion of magnetic materials in traditional absorbing materials is relatively large, which not only has a large mass, but also has the problem of losing magnetism at high temperatures, which seriously affects its high-temperature absorbing performance; while the composite absorbing materials mainly composed of carbon materials have uneven absorption strength. Problems with low and narrow absorption bands
[0003]Metal carbide not only has the characteristics of low density and good high temperature stability, but also has a large adjustable size of metal atoms in its crystal lattice, and has good performance control space. It is beneficial to control its properties in a wide range by adding different metals, but there is no research and report on the composition and electromagnetic absorption properties of high-entropy carbides

Method used

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  • High-entropy wave-absorbing carbide ceramic powder material as well as preparation method and application thereof
  • High-entropy wave-absorbing carbide ceramic powder material as well as preparation method and application thereof
  • High-entropy wave-absorbing carbide ceramic powder material as well as preparation method and application thereof

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preparation example Construction

[0023] According to the second aspect of the present invention, there is provided a method for preparing a high-entropy absorbing carbide ceramic powder material, which is used to prepare the high-entropy absorbing carbide ceramic powder material described in the first aspect, comprising the following steps :

[0024] Step 1, selecting more than five kinds of transition metal oxides, mixing transition metal oxides and carbon black in the presence of a mixed medium to obtain a uniformly mixed slurry;

[0025] In step 2, the slurry obtained in step 1 is dried, sieved to obtain a mixed powder, and the mixed powder is calcined to obtain a carbide ceramic powder material.

[0026] In a preferred embodiment of the present invention, in step 1, the mixed medium is volatile organic matter, preferably absolute ethanol.

[0027] In a preferred embodiment of the present invention, in step 2, the calcination temperature is 1900°C-2100°C, the calcination time is 1-3h, and the calcination ...

Embodiment 1

[0036] Choose TiO 2 , ZrO 2 , HfO 2 , Nb 2 O 5 , Ta 2 O 5 And carbon black as raw material, by mole percentage, weigh 5mol% TiO 2 , 5mol% ZrO 2 , 5mol% HfO 2 , 2.5mol%Nb 2 O 5 , 2.5 mol% Ta 2 O 5 , 80mol% carbon black, mixed in a ball mill tank, the mixing time was 6 hours, and the mixing medium was anhydrous ethyl alcohol to obtain a slurry; the obtained slurry was filtered and dried, and passed through a 120-mesh sieve to obtain a mixture Powder, put the dried powder into a high-temperature furnace for calcination, the calcination temperature is 1900°C, the calcination time is 2 hours, and the vacuum degree is 8Pa to obtain high-entropy wave-absorbing carbide ceramic powder.

[0037]The purity of the ceramic powder material is 100wt%, and the average particle size is 0.3 microns. Using the Agilent N5244A vector network analyzer, the maximum absorption loss at the frequency of 2-18GHz is 38.5dB, and the maximum absorption frequency is when the reflectivity is belo...

Embodiment 2

[0039] This embodiment is consistent with embodiment 1, the only difference is: with TiO 2 , ZrO 2 , HfO 2 , V 2 o 5 、 Ta 2 o 5 And carbon black as raw material, by mole percentage, weigh 5mol% TiO 2 , 5mol% ZrO 2 , 5mol% HfO 2 , 2.5mol% V 2 o 5 , 2.5 mol% Ta 2 o 5 , 80mol% carbon black. The calcination temperature is 1950° C., the calcination time is 1.5 hours, and the vacuum degree is 10 Pa. The obtained high-entropy ceramic powder material has a purity of 100wt%, an average particle size of 0.4 microns, an absorption loss of 30dB at a frequency of 2-18GHz, and a maximum absorption frequency bandwidth of 3.2GHz when the reflectivity is below -10dB.

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Abstract

The invention provides a high-entropy wave-absorbing carbide ceramic powder material as well as a preparation method and application thereof. The ceramic powder material is prepared from the followingraw materials in mole ratio: 0-5mol% of titanium dioxide, 0-5mol% of zirconium dioxide, 0-5mol% of hafnium dioxide, 0-2.5 mol% of niobium pentoxide, 0-2.5 mol% of tantalum pentoxide, 0-2.5 mol% of vanadium pentoxide and the balance of carbon black, the dosage of any more than five transition metal oxides is not 0. The preparation method comprises the following steps of: selecting five or more ofthe transition metal oxides; mixing the transition metal oxides with carbon black in the presence of a mixed medium to obtain uniformly mixed slurry; drying the slurry, sieving the slurry to obtain mixed powder, and calcining the powder to obtain the carbide ceramic powder material. The high-entropy ceramic powder material disclosed by the invention has the characteristics of high purity, good wave-absorbing performance and wide absorption frequency band, and has an excellent application prospect in the field of wave-absorbing materials.

Description

technical field [0001] The invention belongs to the field of microwave absorbing materials and their preparation and application, and relates to a high-entropy microwave-absorbing carbide ceramic powder material, a preparation method and its application, in particular to a high-purity, strong microwave-absorbing performance, and wide-absorbing frequency band. Entropic carbide ceramics, preparation methods and applications. Background technique [0002] With the development of modern science and technology, various electronic and electrical equipment have provided great help for people's daily life. But at the same time, the electromagnetic radiation and interference problems generated by these devices have created new problems for people's production and life, and deteriorated the human existence in space. In addition, in the military field, due to the need for radar stealth, aircraft need to avoid the effect of electromagnetic waves. Therefore, it is necessary to develop ...

Claims

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Application Information

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IPC IPC(8): C04B35/56C09D5/32C04B35/64C04B35/626
CPCC09D5/32C04B35/56C04B35/64C04B35/6261C04B35/62655C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/424C04B2235/5445C04B2235/3239
Inventor 向会敏陈恒周延春戴付志陈海坤
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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