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A kind of Si-y-c ternary ceramic matrix composite material and preparation method thereof

A composite material and ternary ceramic technology, which is applied to improve the water and oxygen corrosion resistance and ablation resistance of ceramic matrix composite materials. Low requirements, short preparation time, high mass fraction effect

Active Publication Date: 2022-05-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to avoid the deficiencies of the prior art, the present invention proposes a Si-Y-C ternary ceramic matrix composite material and a preparation method, which improves the service life of the composite material in extreme environments and solves the problem of preparing a rare earth element modified composite material. Process defects, overcome the shortcomings of high preparation temperature, long preparation cycle, low mass fraction introduced, and incapable of large-scale production

Method used

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  • A kind of Si-y-c ternary ceramic matrix composite material and preparation method thereof
  • A kind of Si-y-c ternary ceramic matrix composite material and preparation method thereof

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Effect test

Embodiment 1

[0051] Step 1. Preparation of fiber prefabricated body: The 0° non-weft cloth, tire mesh, 90° non-weft cloth, and tire mesh are sequentially superimposed to the thickness of the carbon fiber prefabricated body, and the carbon fiber prefabricated body is prepared by relay acupuncture.

[0052] Step 2. Depositing an interface layer: Depositing a pyrolytic carbon interface layer on the carbon fiber preform by chemical vapor infiltration.

[0053] Step 3. prepare matrix: with propylene (C 3 h 6 ) is the gas source, Ar gas is the dilution gas, the deposition temperature of the CVI process is 900°C, the deposition time is 500h, the system pressure is 5kPa, and a sample with an open porosity of 18.5% is obtained.

[0054] Step 4. Introduction of silicon-yttrium alloy by reaction melt infiltration method: the composite material and silicon-yttrium alloy are placed in a graphite box, and the contact method adopts a one-way method. Put the graphite box into a graphite crucible with an...

Embodiment 2

[0056] Step 1. Preparation of fiber prefabricated body: The 0° non-weft cloth, tire mesh, 90° non-weft cloth, and tire mesh are sequentially superimposed to the thickness of the carbon fiber prefabricated body, and the carbon fiber prefabricated body is prepared by relay acupuncture.

[0057] Step 2. Depositing an interface layer: Depositing a pyrolytic carbon interface layer on the carbon fiber preform by chemical vapor infiltration.

[0058] Step 3: Prepare the matrix: use propylene (C 3 h 6 ) is the gas source, Ar gas is the dilution gas, the deposition temperature of the CVI process is 900°C, the deposition time is 500h, the system pressure is 5kPa, and a sample with an open porosity of 19.9% ​​is obtained.

[0059] Step 4. Introduction of silicon-yttrium alloy by reactive melt infiltration method: the composite material and silicon-yttrium alloy are placed in a graphite box, and the contact method is embedding method. Put the graphite box into a graphite crucible with a...

Embodiment 3

[0061] Step 1. Preparation of fiber prefabricated body: After cutting the silicon carbide plain weave fiber cloth to a suitable size, stacking layers, and shaping the silicon carbide fiber prefabricated body with a graphite mold.

[0062] Step 2. Depositing an interface layer: a boron nitride interface layer is deposited on the carbon fiber preform by chemical vapor infiltration.

[0063] Step 3. Prepare the matrix: use trichloromethylsilane (CH 3 SiCl 3 ,MTS) is the gas source, Ar is the diluent gas, and the H 2 MTS is brought into the reaction furnace as a carrier gas, the deposition temperature is 1050°C, the total system pressure is 5kPa, H 2 The molar ratio to MTS is 10:1, and the chemical reaction for preparing SiC is: CH 3 SiCl 3 +H 2 →SiC+HCl. Several heats were deposited to obtain a sample with an open porosity of 24.6%.

[0064] Step 4. Introduce carbon source: mix phenolic resin and absolute ethanol at a mass ratio of 3:10, and stir magnetically for 20 hours ...

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Abstract

The invention relates to a Si-Y-C ternary ceramic matrix composite material and a preparation method thereof. A silicon-yttrium alloy is introduced into the ceramic matrix composite material by using a reaction melt infiltration method to obtain a Si-Y-C ternary ceramic matrix composite material and a preparation method thereof. Composites with metaceramic matrix. The method increases the mass fraction of the introduced rare earth compound, realizes continuous penetration and uniform distribution; the preparation temperature is low, which is beneficial to the full play of the performance of the reinforcement such as the original fiber or whisker. Under the premise of ensuring the mechanical properties of the composite material, its water and oxygen corrosion resistance performance is improved by 100-200%, and its thermal shock resistance performance is improved by 100-150%. Moreover, the process of the method is simple and controllable, requires less equipment, and is conducive to large-scale production.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a Si-Y-C ternary ceramic matrix composite material and a preparation method thereof, which are mainly used in the field of improving the water and oxygen corrosion resistance and ablation resistance performance of ceramic matrix composite materials. Background technique [0002] With the development of industrial production technology and aerospace technology, the demand for composite materials is more diverse, and the requirements for material performance are also getting higher and higher. The working conditions of the new generation of high-performance aeroengines are harsh, which puts forward high requirements on the water and oxygen corrosion resistance of materials; for the thermal protection system of rocket engines, it is required to have excellent ablation resistance. Therefore, one of the main development directions of ceramic matrix composites is to improve the service...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/58C04B35/622
CPCC04B35/58085C04B35/622C04B2235/5248C04B2235/3826C04B2235/422C04B2235/5244C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77
Inventor 刘永胜高雨晴董宁王晶贺芳
Owner NORTHWESTERN POLYTECHNICAL UNIV