ZnO-C/Al2SiO5 low-density high-loss complex-phase wave-absorbing ceramic and preparation method thereof

A multi-phase ceramic and high-loss technology, applied in the field of wave-absorbing materials, can solve the problems of low dielectric loss in the imaginary part of the dielectric constant, the need to improve the conductance loss capability, and the low conductivity of ZnO, so as to avoid electromagnetic reflection and shorten the cycle , the effect of low density

Inactive Publication Date: 2021-06-18
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

The dielectric constant and dielectric loss of zinc oxide (ZnO) can be adjusted in a wide range due to structural defects, microscopic morphology, element doping and other factors. It has great potential as a wave absorber, but its shortcomings Because the conductivity of ZnO is relatively low, the conductance loss capability needs to be improved. Therefore, when a single dielectric oxide such as ZnO is used as a wave absorber, it usually faces a low imaginary part of the dielectric constant and insufficient dielectric loss capability.
[0004] The existing preparation method of absorbing materials usually adopts brushing process to mix the absorbing agent into the binder, and obtain the absorbing coating through the coating process. The preparation process is complicated and the preparation period is long, which increases the Weight, and the coating is easy to fall off under severe thermal environment, which limits the application of this type of absorbing material, and the absorbing performance needs to be further improved

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  • ZnO-C/Al2SiO5 low-density high-loss complex-phase wave-absorbing ceramic and preparation method thereof
  • ZnO-C/Al2SiO5 low-density high-loss complex-phase wave-absorbing ceramic and preparation method thereof
  • ZnO-C/Al2SiO5 low-density high-loss complex-phase wave-absorbing ceramic and preparation method thereof

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preparation example Construction

[0033] The invention discloses a porous ZnO-C / Al 2 SiO 5 Low-density high-loss complex-phase wave-absorbing ceramics; the porous ZnO-C / Al 2 SiO 5 Composite ceramics with porous Al 2 SiO 5 The ceramic fiberboard is a wave-transparent matrix, and in Al 2 SiO 5 The internal pores of the ceramic fiber board are uniformly filled with C and ZnO two-phase particles; the density of the composite ceramic is ≤0.6g / cm 3 , has strong loss performance and excellent microwave absorption performance, and the preparation method of the material specifically includes the following steps:

[0034] 1) Mix glucose and zinc acetate evenly at a molar ratio, then add deionized water to stir and dissolve, and stir the mixed solution at 60°C for 1 h to obtain a glucose-zinc acetate composite solution. The molar ratio of glucose and zinc acetate is Between 1:1 and 1:4, the concentration of glucose in the solution is 0.05g / mL, and the concentration of zinc acetate in the solution is 0.05~0.2 g / mL;...

Embodiment 1

[0039] 1) Mix glucose and zinc acetate evenly at a molar ratio of 1:1, then add deionized water and stir to dissolve. The concentration of glucose in the solution is 0.05 g / mL, and the concentration of zinc acetate in the solution is 0.05 g / mL. Stir magnetically for 0.5 h at 60°C to obtain a mixed solution of glucose-zinc acetate;

[0040] 2) Cut the porous Al into the desired size 2 SiO 5 Immerse the ceramic fiberboard into the solution in step 1), vacuum impregnate for 0.5h, and 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 300°C for 0.5h. The heating rate is 5°C / min to obtain porous ZnO-C / Al impregnated once 2 SiO 5 For the composite ceramic body, the drying process does not require a protective atmosphere, it is carried out in an air environment, and the heat treatment is carried out in an Ar atmosphere protection;

[0041] 3) Immerse the multiphase ceramic body in step 2) into the ...

Embodiment 2

[0048] 1) Mix glucose and zinc acetate evenly in a molar ratio of 1:2, then add deionized water and stir to dissolve. The concentration of glucose in the solution is 0.05g / mL, and the concentration of zinc acetate in the solution is 0.1 g / mL. Stir magnetically for 0.5 h at 60°C to obtain a mixed solution of glucose-zinc acetate;

[0049] 2) Cut the porous Al into the desired size 2 SiO 5 Immerse the ceramic fiberboard into the solution in step 1), vacuum impregnate for 0.5h, and 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 300°C for 0.5h. The heating rate is 5°C / min to obtain porous ZnO-C / Al impregnated once 2 SiO 5 For the composite ceramic body, the drying process does not require a protective atmosphere, it is carried out in an air environment, and the heat treatment is carried out in an Ar atmosphere protection;

[0050] 3) Immerse the multiphase ceramic body in step 2) into the so...

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Abstract

The invention discloses a ZnO-C / Al2SiO5 low-density high-loss complex-phase wave-absorbing ceramic and a preparation method of the ZnO-C / Al2SiO5 complex-phase wave-absorbing ceramic. According to the specific technical scheme, a porous Al2SiO5 ceramic fiber board is selected as a base material, a solution impregnation method is adopted to introduce a glucose-zinc acetate solution into the porous Al2SiO5 ceramic fiber board through a vacuum or pressure impregnation process, then conversion into ZnO and pyrolytic carbon is achieved through heat treatment, the interior of an Al2SiO5 ceramic base body is evenly filled with the two phases. The component proportion of the C phase and the ZnO phase can be adjusted and controlled by adjusting the proportion of glucose and zinc acetate in a solution, the required content of the ZnO-C wave-absorbing agent in a matrix is achieved through multiple times of impregnation, the microstructure and the crystallization degree of the ZnO phase and the C phase are adjusted and controlled through heat treatment, and the ZnO-C / Al2SiO5 low-density and high-loss complex-phase wave-absorbing ceramic is obtained. The whole preparation process 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 wave-absorbing materials, in particular to a ZnO-C / Al 2 SiO 5 Low-density high-loss complex-phase wave-absorbing ceramics and a preparation method thereof. Background technique [0002] Absorbing materials should have the performance characteristics of "light, thin, wide, and strong", and absorbing materials with low density and strong loss characteristics have important application prospects. In order to reduce the density of the absorbing material, low-density rigid mullite (Al 2 SiO 5 ) Fibrous porous ceramics are used as the matrix, and a high-loss absorber is introduced inside to obtain a multi-phase ceramic absorber. The fibrous porous ceramic matrix has the characteristics of low density, low dielectric loss, stable shape and structure, and excellent thermal insulation performance. Al 2 SiO 5 Fibrous porous ceramic materials have good chemical stability and are suitable for use as a wave-transmitting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/84C04B35/18
CPCC04B35/18C04B2235/422C04B2235/3284C04B2235/48C04B2235/449C04B2235/77C04B2235/96C04B2235/6582
Inventor 孔硌张贺天绮齐珺骆思翰张书瑜杨军沈学涛许占位
Owner SHAANXI UNIV OF SCI & TECH
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