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High-temperature broadband wave-absorbing Al2O3f reinforced ceramic-based composite material and integrated preparation method

A composite material, al2o3f technology, applied in the direction of shielding materials, magnetic field/electric field shielding, electrical components, etc., can solve problems such as impedance mismatch and wave-absorbing performance degradation, influence of composite material mechanical properties, continuous fiber damage, etc., to achieve the production cycle Short, simple design and molding method, strong designability

Pending Publication Date: 2022-03-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the laser etching periodic structure has certain damage to the continuous fiber, which will affect the overall mechanical properties of the composite material; and the conductivity of the SiC fiber will increase at high temperature, which will lead to impedance mismatch and decrease in absorbing performance.

Method used

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  • High-temperature broadband wave-absorbing Al2O3f reinforced ceramic-based composite material and integrated preparation method
  • High-temperature broadband wave-absorbing Al2O3f reinforced ceramic-based composite material and integrated preparation method
  • High-temperature broadband wave-absorbing Al2O3f reinforced ceramic-based composite material and integrated preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Al 2 o 3 Put the fiber cloth into a box furnace and heat-treat it in the air at 600°C-700°C for 5h-6h to remove the sizing agent on the fiber surface;

[0031] (2) the monolayer Al 2 o 3 The fiber cloth is cut into a size of 200mm×200mm, according to figure 2 The size of the honeycomb absorbing unit of a is to sew the C fiber on the single layer of Al 2 o 3 On the fiber cloth, the conductivity of the C fiber is about 10 5 S / m;

[0032] (3) Al in step 2 2 o 3 5 layers of wave-transparent Al are placed on the top and bottom of the fiber cloth 2 o 3 Fiber cloth, stacked into a sandwich structure, and fixed with graphite abrasives to obtain Al 2 o 3 fiber preform;

[0033] (4) the above Al 2 o 3 After the fiber preform was vacuum impregnated in the polysiloxane precursor solution for 0.5h, it was cracked at 900°C for 2h under the protection of an inert atmosphere (argon or nitrogen) to prepare the SiOC matrix, and a broadband absorbing Al 2 o 3f / SiOC co...

Embodiment 2

[0036] (1) Al 2 o 3 Put the fiber cloth into a box furnace and heat-treat it in the air at 600°C-700°C for 5h-6h to remove the sizing agent on the fiber surface;

[0037] (2) the monolayer Al 2 o 3 The fiber cloth is cut into a size of 200mm×200mm, according to figure 2 The size of the honeycomb absorbing unit of a is to sew the C fiber on the single layer of Al 2 o 3 On the fiber cloth, the conductivity of the C fiber is about 10 5 S / m;

[0038] (3) Al with absorbing unit in step 2 2 o 3 The fiber cloth is placed on the top layer, and 10 layers of wave-transparent Al are stacked underneath 2 o 3 fiber cloth, and fixed with graphite abrasives to obtain Al 2 o 3 fiber preform;

[0039] (4) the above Al 2 o 3 After the fiber preform was vacuum impregnated in the polysiloxane precursor solution for 0.5h, it was cracked at 900°C for 2h under the protection of an inert atmosphere (argon or nitrogen) to prepare the SiOC matrix, and a broadband absorbing Al 2 o 3f / ...

Embodiment 3

[0042] (1) Al 2 o 3 Put the fiber cloth into a box furnace and heat-treat it in the air at 600°C-700°C for 5h-6h to remove the sizing agent on the fiber surface;

[0043] (2) the monolayer Al 2 o 3 The fiber cloth is cut into a size of 200mm×200mm, according to figure 2 The size of the honeycomb absorbing unit of b is to sew the C fiber on the single layer of Al 2 o 3 On the fiber cloth, the conductivity of the C fiber is about 10 5 S / m;

[0044] (3) Al in step 2 2 o 3 5 layers of wave-transparent Al are placed on the top and bottom of the fiber cloth 2 o 3 Fiber cloth, stacked into a sandwich structure, and fixed with graphite abrasives to obtain Al 2 o 3 fiber preform;

[0045] (4) the above Al 2 o 3 After the fiber preform was vacuum impregnated in the polysiloxane precursor solution for 0.5h, it was cracked at 900°C for 2h under the protection of an inert atmosphere (argon or nitrogen) to prepare the SiOC matrix, and a broadband absorbing Al 2 o 3f / SiOC ...

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Abstract

The invention relates to a high-temperature broadband wave-absorbing Al2O3f reinforced ceramic-based composite material and an integrated preparation method, which are used for solving the technical problem of narrow high-temperature wave-absorbing frequency band of the existing ceramic-based composite material. According to the technical scheme, the broadband wave-absorbing Al2O3f / SiOC composite material is obtained by optimally designing a wave-absorbing structure unit in an Al2O3f fiber preform through HFSS software, preparing conductive carbon fibers with a certain periodic structure on Al2O3f fiber cloth by adopting a manual sewing process, and then preparing a ceramic matrix in the Al2O3f fiber preform with the periodic structure by adopting a precursor infiltration pyrolysis method (PIP method). According to the method, periodic structure design and content regulation and control can be directly carried out on the wave-absorbing unit of the composite material, a wave-absorbing agent does not need to be chemically synthesized, the preparation process is simple, the period is short, and composite material fibers are not damaged. By regulating and controlling the periodic wave-absorbing unit and the wave-absorbing agent of the Al2O3f reinforced composite material, the broadband wave-absorbing performance of the composite material can be effectively improved, and the Al2O3f reinforced composite material has the potential to become an excellent broadband wave-absorbing type ceramic matrix composite material.

Description

technical field [0001] The invention belongs to the technical field of load-carrying wave-absorbing ceramic matrix composite materials, and relates to a high-temperature broadband wave-absorbing Al 2 o 3f Reinforced ceramic matrix composite material and integrated preparation method. Background technique [0002] With the development of all-round radar detection technology, the radar stealth problem of aero-engine hot-end components needs to be solved urgently. Fiber-reinforced ceramic matrix composites have the advantages of high strength, high temperature resistance, oxidation resistance, and designable electromagnetic properties, and have good development potential in load-bearing and absorbing waves. Al 2 o 3 The fiber has the advantages of high melting point, corrosion resistance, high temperature resistance, excellent mechanical properties, etc., and is a good wave-transmitting material. Take Al 2 o 3 Fiber is used as a reinforcement to prepare composite materia...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/84H05K9/00C04B35/565C04B35/58
CPCC04B35/80H05K9/009C04B35/565C04B35/58C04B2235/5224C04B2235/5244C04B2235/5248C04B2235/96
Inventor 杨帆薛继梅
Owner NORTHWESTERN POLYTECHNICAL UNIV
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