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Rapid preparation method of high-temperature-resistant structured wave-absorbing ceramic matrix composite material

A composite material and wave-absorbing technology, which is applied in the field of ceramic matrix composite material preparation, can solve the problems of urgent improvement of material properties, high cost, long cycle, etc., to enhance mechanical properties and anti-oxidation properties, improve density, and reduce porosity. rate effect

Active Publication Date: 2018-12-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a rapid preparation method for high-temperature-resistant structural wave-absorbing ceramic matrix composites, solving the problem of preparing structural wave-absorbing ceramic matrix composites in the prior art (CVI method, PIP method) Problems such as long cycle time, high cost, and material performance need to be improved urgently

Method used

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  • Rapid preparation method of high-temperature-resistant structured wave-absorbing ceramic matrix composite material
  • Rapid preparation method of high-temperature-resistant structured wave-absorbing ceramic matrix composite material
  • Rapid preparation method of high-temperature-resistant structured wave-absorbing ceramic matrix composite material

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preparation example Construction

[0030] The technical scheme used by the present invention to solve its technical problems: a rapid preparation method of a high temperature resistant structural wave absorbing ceramic matrix composite material, which is characterized by comprising the following steps:

[0031] (a) Preparation of uniform and dense thin BN interfaces and Si inside / surface of pretreated fiber preforms 3 N 4 matrix to obtain loose SiC with large porosity f / Si 3 N 4 Composites, Si 3 N 4 The matrix effectively fills the pores in the fiber bundles, and partially fills the gaps between the fiber bundles, which can effectively protect the fibers from damage. Ultrasonic cleaning and drying of preforms with certain density and open porosity;

[0032] (b) Add sodium carboxymethyl cellulose and BN powder (BN is hexagonal BN, cubic BN or rhombohedral BN), Si 3 N 4 Powder (Si 3 N 4 for α-Si 3 N 4 or β-Si 3 N 4 ), SiC powder (SiC is α-SiC or β-SiC) or C+Si 3 N 4 Mixed powder (C includes but i...

Embodiment 1

[0035] Example 1: Preparation of uniform and dense BN interface (about 480 nm) inside / surface of the pretreated two-dimensional porous SiC fiber preform, such as figure 2 , the preparation of dense Si in preforms with BN interface 3 N 4 matrix to obtain loose two-dimensional porous SiC with large porosity f / Si 3 N 4 Composite preform with a density of 1.6 g / cm 3 , the porosity is 42vol.%, after ultrasonic cleaning and drying, it is ready for use, such as image 3 shown. Add 1g of sodium carboxymethylcellulose and 100g of hexagonal BN powder with a particle size of 1μm to 200g of distilled water, stir evenly, put it into a ball mill, add a total weight of 600g of corundum with a particle size of 5-12mm and ball mill for 10h to make pulp material. Slurry impregnation adopts the method of vacuum impregnation combined with pressure impregnation. Open container filled with slurry and 2D SiC f / Si 3 N 4 The composite material preform is put into the same airtight contai...

Embodiment 2

[0036] Example 2: Preparation of uniform and dense BN interface (about 380 nm) inside / surface of pretreated three-dimensional porous SiC fiber preform, and preparation of dense Si in the preform with BN interface 3 N 4 The matrix obtains loose three-dimensional porous SiC with large porosity f / Si 3 N 4 Composite preform with a density of 1.7 g / cm 3 , the porosity is about 43vol.%, and it will be used after ultrasonic cleaning and drying. Add 1.5g of sodium carboxymethylcellulose and 150g of β-SiC powder with a particle size of 2μm to 300g of distilled water, stir evenly, pour into a ball mill, and add 900g of corundum balls with a particle size of 5-12mm in a total weight of 900g and ball mill for 15h. into slurry. Slurry impregnation adopts the method of vacuum impregnation combined with pressure impregnation. The open container containing the slurry and the three-dimensional SiC f / Si 3 N 4 The composite material preform is placed in the same airtight container, va...

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Abstract

The invention relates to a rapid preparation method of a high-temperature-resistant structured wave-absorbing ceramic matrix composite material. The SI+RMI process is adopted to prepare a SiC fiber-reinforced silicon-based ceramic matrix composite material. Firstly, Si3N4 powder, BN powder, SiC powder, or C + Si3N4 mixed powder is respectively introduced into a SiC fiber preform through the SI process; and then, through the RMI process, a silicon melt is infiltrated into the composite material to be combined with or react with the above powder respectively so as to generate a Si3N4-Si matrix,a Si-B-N matrix, a SiC-Si matrix or a Si-C-N matrix, and an electromagnetic impedance matching type matrix (such as Si3N4-Si, Si-B-N, etc.) or an electromagnetic wave-absorbing type matrix (such as SiC-Si, Si-C-N, etc.) which meets the requirements of the structure wave-absorbing ceramic matrix composite material is prepared. Rapid densification of the composite material is realized, preparation cycle of the composite material is effectively shortened, and density and mechanical / wave-absorbing properties of the composite material are improved.

Description

technical field [0001] The invention belongs to the preparation technology of a ceramic matrix composite material, and relates to a rapid preparation method of a high temperature resistant structural wave absorbing ceramic matrix composite material. Background technique [0002] Absorbers refer to a class of electromagnetic functional materials that effectively absorb incident electromagnetic waves, convert electromagnetic energy into heat energy or other forms of energy and consume it, or cancel electromagnetic wave interference, thereby significantly reducing the target echo intensity. The ideal absorbing material should have the characteristics of thin thickness, light weight, wide absorption frequency band, good mechanical properties, etc. At the same time, in order to meet the requirements of special situations, it also needs to have high temperature resistance, oxidation resistance and other properties. Due to the limitation of its use temperature, organic absorbers ca...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/591C04B35/573C04B35/583C04B35/622
CPCC04B35/806C04B35/573C04B35/583C04B35/591C04B35/622C04B2235/383C04B2235/3834C04B2235/386C04B2235/3878C04B2235/3882C04B2235/424C04B2235/425C04B2235/428C04B2235/5244C04B2235/616C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/77
Inventor 叶昉殷小玮莫然成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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