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Multi-scale toughened laminated structure microwave-absorbing ceramic matrix composite and its preparation method

A composite material, multi-scale technology, applied in the field of materials, can solve the problems of uneven distribution of one-dimensional nano materials and affect the uniformity of material properties, so as to avoid uneven distribution inside and outside, improve mechanical properties and bearing capacity, and ensure structural integrity. sexual effect

Active Publication Date: 2022-04-08
湖北瑞宇空天高新技术有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to further improve the mechanical properties and wave-absorbing properties of ceramic matrix composites, one-dimensional nanomaterials can be introduced into the material to achieve multi-scale toughening of the material. The fracture and extraction of one-dimensional nanomaterials increase the loading process of the material. The energy dissipation mechanism in the material, but the addition of one-dimensional nanofillers is easy to form agglomeration inside the material, which affects its performance and the performance uniformity of the material.
Even if the chemical vapor deposition method is used to grow one-dimensional nanomaterials in situ inside the material, the distribution of one-dimensional nanomaterials will be uneven due to the distribution of pores inside the preform and the difference in the gas concentration field and temperature field in the deposition environment.

Method used

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preparation example Construction

[0028] A method for preparing a multi-scale toughened layered structure microwave-absorbing ceramic matrix composite material, the specific steps are:

[0029] Step 1: Prepare a BN / SiC composite interface layer on the fiber surface inside the single-layer fiber cloth layer, the thickness of the BN interface layer is 300-1500 nm, and the thickness of the SiC interface layer is 200-1000 nm. The reinforcing fiber used in the single-layer fiber cloth layer is silicon carbide fiber, and the weaving structure of the fiber cloth is plain weave, twill weave or satin weave. The preparation method of the BN / SiC composite interface layer is specifically: placing multiple single-layer fiber cloth layers in a CVI deposition furnace, first using BCl 3 -NH 3 -Ar-H2 precursor gas system to prepare BN interface layer on the fiber surface of single-layer fiber cloth layer, BCl 3 -NH 3 -Ar-H 2 BCl in precursor gas system 3 with NH 3 The flow ratio is 1:3 to 1:5; then the SiC layer is prepa...

Embodiment 1

[0034] Step 1: Prepare a BN / SiC composite interface layer on the fiber surface inside the single-layer silicon carbide fiber cloth layer to obtain a primary fiber cloth; the single-layer fiber cloth weaving structure is a plain weave structure, the thickness of the BN interface layer is 300nm, and the SiC interface layer The thickness is 500nm. BN interface adopts BCl 3 -NH 3 -Ar-H 2 The system is prepared on the fiber surface, BCl 3 -NH 3 -Ar-H 2 BCl in precursor gas system 3 with NH 3 The flow ratio is 1:3, and the SiC interface adopts MTS-Ar-H 2 The system is prepared on the surface of BN layer, MTS-Ar-H 2 MTS and (Ar+H 2 ) The gas flow ratio is 1:10.

[0035] Step 2: Introduce a catalyst into the primary fiber cloth prepared in step 1, and grow a one-dimensional nano-toughened phase on the surface of the BN / SiC composite interface layer in situ by chemical vapor deposition to obtain a secondary fiber cloth. The catalyst used is Co(NO 3 ) 2 ·6H 2 O, arrange th...

Embodiment 2

[0040] Step 1: Prepare a BN / SiC composite interface layer on the fiber surface inside the single-layer silicon carbide fiber cloth layer to obtain a primary fiber cloth; the weaving structure of the single-layer fiber cloth is a twill structure, the thickness of the BN interface layer is 1500nm, and the SiC interface layer The thickness is 500nm. BN interface adopts BCl 3 -NH 3 -Ar-H 2 The system is prepared on the fiber surface, BCl 3 -NH 3 -Ar-H 2 BCl in precursor gas system 3 with NH 3 The flow ratio is 1:3, and the SiC interface adopts MTS-Ar-H 2 The system is prepared on the surface of BN layer, MTS-Ar-H 2 MTS and (Ar+H 2 ) The gas flow ratio is 1:20.

[0041] Step 2: Introduce a catalyst into the primary fiber cloth prepared in step 1, and grow a one-dimensional nano-toughened phase on the surface of the BN / SiC composite interface layer in situ by chemical vapor deposition to obtain a secondary fiber cloth. The catalyst used is Ni(NO 3 ) 2 ·6H 2 O, arrange ...

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Abstract

A multi-scale toughened laminated structure wave-absorbing ceramic matrix composite material and a preparation method thereof, the preparation method steps are: deposition of an interface layer, introduction of a one-dimensional nano-toughening phase, design of a laminated structure prefabricated body, and extraction of a precursor Filter maceration, cracking. The in-situ introduction of one-dimensional reinforcement phases in continuous fiber reinforced ceramic matrix composites has achieved multi-stage toughening of ceramic matrix composites. The one-dimensional nano-reinforcement phase is introduced by in-situ growth before the fiber preform is formed, which ensures a strong bonding force between the one-dimensional nanostructure and the fiber, and at the same time realizes the uniform distribution of the nano-reinforcement phase in the ceramic matrix composite material, improving the It improves the designability of the microstructure of the composite material and shortens the preparation cycle. The nano-wave absorbing agent is distributed in a gradient in the composite material by using the suction filtration and impregnation process, which can ensure that the material has excellent wave-absorbing performance. Design requirements for end components.

Description

technical field [0001] The invention relates to the field of materials, in particular to a multi-scale toughened laminate structure microwave-absorbing ceramic-based composite material and a preparation method thereof. Background technique [0002] Radar stealth is of great significance to the improvement of the combat effectiveness of aerospace vehicles. In order to meet the needs of the radar stealth performance of the hot-end components of the new generation of aerospace vehicles in my country, on the basis of the design of the component structure, the materials used for the hot-end components are also proposed. Requirements such as light weight, high strength, temperature resistance, and oxidation resistance, as well as excellent wave-absorbing properties, are urgently needed to develop wave-absorbing structural materials. An important development direction of radar stealth aerospace vehicle materials. [0003] Continuous SiC fiber-reinforced ceramic matrix composites hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/84C04B35/628
CPCC04B35/80C04B35/62868C04B35/62863C04B35/62884C04B35/62894C04B2235/608C04B2235/3873C04B2235/5244C04B2235/96C04B2235/422
Inventor 罗瑞盈崔光远
Owner 湖北瑞宇空天高新技术有限公司