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a porous co 3 o 4 / al 2 sio 5 Low-density wave-absorbing composite phase ceramics and preparation method thereof

A composite ceramic and low-density technology, which is applied in the field of porous Co3O4/Al2SiO5 low-density wave-absorbing type composite ceramics and its preparation, can solve the problems of limited application of wave-absorbing materials, complex preparation process, and long preparation cycle, and achieve improved Interface polarization and dielectric loss capability, improved absorbing performance, low density effect

Active Publication Date: 2021-03-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing methods for preparing wave-absorbing composite materials usually introduce wave-absorbing agents into fiber preforms by dipping or brushing, and finally obtain composite materials, but the preparation process is complicated and the raw materials are limited, which makes the preparation cost high. The cycle is longer, and the density of the final absorbing composite material prepared is generally greater than 2g / cm 3 , so that the application of this type of absorbing material is limited, especially in aerospace and other fields that have strict requirements on material density, the absorbing performance of the absorbing material needs to be further improved

Method used

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  • a porous co <sub>3</sub> o <sub>4</sub> / al <sub>2</sub> sio <sub>5</sub> Low-density wave-absorbing composite phase ceramics and preparation method thereof
  • a porous co <sub>3</sub> o <sub>4</sub> / al <sub>2</sub> sio <sub>5</sub> Low-density wave-absorbing composite phase ceramics and preparation method thereof
  • a porous co <sub>3</sub> o <sub>4</sub> / al <sub>2</sub> sio <sub>5</sub> Low-density wave-absorbing composite phase ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Add cobalt acetate tetrahydrate and monoethanolamine into absolute ethanol at a molar ratio of 1:1, the molar concentration of cobalt acetate is 0.1mol / L, and stir magnetically for 1 hour at 30°C to obtain a precursor solution;

[0042] 2) Cut the porous Al into the desired size 2 SiO 5 Immerse the ceramic fiber board into the solution in step 1) for 0.5h under vacuum impregnation, the vacuum degree is less than 50Pa, and prepare a preform. The prepared preform is dried at 100°C for 0.5h, and then heat-treated at 200°C for 0.5h. The heating rate is at 1°C / min, one-time impregnated porous Co 3 o 4 / Al 2 SiO 5 For composite ceramics, the above process does not require a protective atmosphere and is carried out in an air environment;

[0043] 3) Immerse the multiphase ceramics in step 2) into the solution of step 1), and perform drying and heat treatment according to step 2), and cycle 15 times in this way, the Co in the multiphase ceramics 3 o 4 The content is 15%...

Embodiment 2

[0047] 1) Add cobalt acetate tetrahydrate and monoethanolamine into absolute ethanol at a molar ratio of 1:1, the molar concentration of cobalt acetate is 0.2mol / L, and stir magnetically for 1 hour at 30°C to obtain a precursor solution;

[0048] 2) Cut the porous Al into the desired size 2 SiO 5 Immerse the ceramic fiber board into the solution in step 1), and immerse it at a high pressure of 1Mpa for 0.5h to prepare a preform, dry the prepared preform at 100°C for 0.5h, and then heat treat it at 300°C for 1h, with a heating rate of 2°C / min, to obtain a porous Co impregnated once 3 o 4 / Al 2 SiO 5 For composite ceramics, the above process does not require a protective atmosphere and is carried out in an air environment;

[0049] 3) Immerse the multiphase ceramics in step 2) into the solution of step 1), and perform drying and heat treatment according to step 2), and cycle 12 times in this way, the Co in the multiphase ceramics 3 o 4 The content is 27.5%;

[0050] 4) ...

Embodiment 3

[0053] 1) Add cobalt acetate tetrahydrate and monoethanolamine into absolute ethanol at a molar ratio of 1:1, the molar concentration of cobalt acetate is 0.3mol / L, and stir magnetically at 30°C for 1 hour to obtain a precursor solution;

[0054] 2) Cut the porous Al into the desired size 2 SiO 5 Immerse the ceramic fiber board into the solution in step 1), and immerse it at a high pressure of 5MPa for 0.5h to prepare a preform, dry the prepared preform at 100°C for 0.5h, and then heat treat it at 300°C for 0.5h, with a heating rate of 2°C / min, get impregnated porous Co once 3 o 4 / Al 2 SiO 5 For composite ceramics, the above process does not require a protective atmosphere and is carried out in an air environment;

[0055] 3) Immerse the multiphase ceramics in step 2) into the solution of step 1), and perform drying and heat treatment according to step 2), and cycle 10 times in this way, the Co in the multiphase ceramics 3 o 4 The content is 42.5%;

[0056] 4) Place ...

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Abstract

The invention discloses a porous Co3O4 / Al2SiO5 low-density wave-absorbing-type composite-phase ceramic and a preparation method thereof. Particles of a Co3O4 wave-absorbing agent in the composite-phase ceramic are evenly dispersed in an Al2SiO5 ceramic fiberboard, which helps to improve the wave-absorbing performance of the material; the Co3O4 wave-absorbing agent in the composite ceramic has dielectric loss and magnetic loss on an electromagnetic wave; a layer of Co simple substance interface layer wraps the surface of each Co3O4 particle. The composite-phase ceramic material is low in density and good in high temperature resistance. According to the preparation method, a dipping method is adopted for introducing the wave-absorbing agent raw material into the porous ceramic, and the wave-absorbing agent in the obtained Co3O4 / Al2SiO5 composite-phase ceramic can be evenly dispersed, which helps to improve the wave-absorbing performance of the material; the selected porous Al2SiO5 ceramic fiberboard is used as a base material and has the advantages of being resistant to high temperature and low in density, in the preparation process, the shape and size of the Al2SiO5 ceramic fiberboard are not changed, and the composite-phase ceramic keeps low density; according to the method, the whole preparation technology is simple in step, short in period, easy to operate and good in repeatability.

Description

【Technical field】 [0001] The invention belongs to the field of radar wave-absorbing porous composite ceramics, in particular to a porous Co 3 o 4 / Al 2 SiO 5 Low-density wave-absorbing composite ceramics and a preparation method thereof. 【Background technique】 [0002] Radar wave absorbing materials should have the characteristics of strong absorption capacity, wide absorption frequency band, thin thickness, high temperature resistance, oxidation resistance, etc., and also need to have a low density. The absorbing materials with simple preparation process, excellent absorbing performance and low density have important application potential in civil and national defense fields. [0003] The usual radar wave absorbing material consists of a wave-transparent carrier loaded with a microwave absorber. Microwave absorbers have high dielectric loss or (and) high magnetic loss characteristics, including carbon nanotubes, silicon carbide, ferrite, etc. Co used 3 o 4 Nanoparti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/18C04B35/622
CPCC04B35/18C04B35/622C04B38/00C04B2235/3277C04B2235/405C04B2235/5228C04B2235/616
Inventor 孔硌郝瑶睿齐珺沈学涛杨军许占位
Owner SHAANXI UNIV OF SCI & TECH
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