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A rapid preparation method of high-temperature-resistant structural wave-absorbing ceramic matrix composites

A composite material and wave-absorbing technology, which is applied in the field of ceramic matrix composite material preparation, can solve the problems of long cycle, high cost, and urgent improvement of material performance.

Active Publication Date: 2021-07-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • 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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  • A rapid preparation method of high-temperature-resistant structural wave-absorbing ceramic matrix composites
  • A rapid preparation method of high-temperature-resistant structural wave-absorbing ceramic matrix composites
  • A rapid preparation method of high-temperature-resistant structural wave-absorbing ceramic matrix composites

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preparation example Construction

[0030] The technical solution 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 in that it includes the following steps:

[0031] (a) Preparation of uniform and dense thin BN interface and Si in the interior / surface of the pretreated fiber preform 3 N 4 matrix, to obtain SiC in a loose state with a large porosity f / Si 3 N 4 Composite material, 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 the prefabricated body with a certain density and open porosity;

[0032] (b) Add sodium carboxymethylcellulose and BN powder (BN is hexagonal BN, cubic BN or rhombohedral BN), Si 3 N 4 Powder (Si 3 N 4 α-Si 3 N 4 or β-Si 3 N 4 ), SiC powder (SiC is α-SiC or β-...

Embodiment 1

[0036] Example 1: Prepare a uniform and dense BN interface (about 480nm) inside / surface of the pretreated two-dimensional porous SiC fiber preform, such as figure 2 As shown, the preparation of dense Si in the preform with BN interface 3 N 4 matrix, to obtain a two-dimensional porous SiC in a loose state with a large porosity f / Si 3 N 4 Composite preform with a density of 1.6 g / cm 3 , with a porosity of 42vol.%, after ultrasonic cleaning and drying, for use, such as image 3 shown. Add 1g of sodium carboxymethyl cellulose 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 tank, add 600g of corundum balls with a particle size of 5-12mm in total weight and ball mill for 10 hours to make a slurry material. Slurry impregnation adopts the method of vacuum impregnation combined with pressure impregnation. The open container containing the slurry and the two-dimensional SiC f / Si 3 N 4 Put the comp...

Embodiment 2

[0037] Example 2: Prepare a uniform and dense BN interface (about 380nm) inside / surface of the pretreated three-dimensional porous SiC fiber preform, and prepare a dense Si in the preform with a BN interface. 3 N 4 The matrix obtains a three-dimensional porous SiC in a loose state with a 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 is used after ultrasonic cleaning and drying. Add 1.5 g of sodium carboxymethylcellulose and 150 g of β-SiC powder with a particle size of 2 μm in 300 g of distilled water, stir well, pour into a ball mill jar, add 900 g of corundum balls with a particle size of 5 to 12 mm in total weight, and mill for 15 hours. into slurry. Slurry impregnation adopts the method of vacuum impregnation combined with pressure impregnation. The open container containing the slurry and the 3D SiC f / Si 3 N 4 Put the composite material prefabricated body into the same airtight container, vacuum...

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Abstract

The invention relates to a rapid preparation method of a high-temperature-resistant structural wave-absorbing ceramic matrix composite material. The SiC fiber-reinforced silicon-based ceramic matrix composite material is prepared by using the SI+RMI process, that is, firstly, Si is respectively introduced into the SiC fiber prefabricated body through the SI process. 3 N 4 Powder, BN powder, SiC powder, or C+Si 3 N 4 Mix the powder, and then infiltrate the silicon melt into the composite material through the RMI process, and combine or react with the above powder to form Si3N 4 ‑Si matrix, Si‑B‑N matrix, SiC‑Si matrix, or Si‑C‑N matrix, to prepare an electromagnetic impedance matching matrix (such as Si 3 N 4 ‑Si, Si‑B‑N, etc.) or electromagnetic wave-absorbing substrates (such as SiC‑Si, Si‑C‑N, etc.), to achieve rapid densification of composite materials, effectively shorten the preparation cycle of composite materials, and improve the density of composite materials and mechanical / absorbing properties.

Description

technical field [0001] The invention belongs to the preparation technology of ceramic-based composite materials, and relates to a rapid preparation method of high-temperature-resistant structural wave-absorbing ceramic-based composite materials. Background technique [0002] Absorbing materials refer to a type of electromagnetic functional material that effectively absorbs incident electromagnetic waves, converts electromagnetic energy into heat energy or other forms of energy, or makes electromagnetic waves interfere and cancel, thereby significantly reducing the target echo intensity. The ideal absorbing material should have the characteristics of thin thickness, light weight, wide absorption frequency band, and good mechanical properties. At the same time, in order to meet the requirements of special circumstances, it also needs to have high temperature resistance and oxidation resistance. Due to the limitation of its use temperature, organic microwave absorbers can only ...

Claims

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Application Information

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