Method for preparing SiCf/Si-Y-B-C composite material by combining vacuum impregnation with reactive melt impregnation

A technology of si-y-b-c and composite materials, applied in the field of composite materials, can solve the problems of matrix resistance to water and oxygen, poor water and oxygen resistance, high formation temperature, etc., to improve water and oxygen corrosion resistance, reduce fiber structure and performance effect, the effect of short preparation time

Pending Publication Date: 2022-06-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method improves the water and oxygen corrosion resistance of the composite material, but there are a large number of alloy residues inside the matrix, which has a great impact on the water and oxygen resistance of the matrix.
M

Method used

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  • Method for preparing SiCf/Si-Y-B-C composite material by combining vacuum impregnation with reactive melt impregnation
  • Method for preparing SiCf/Si-Y-B-C composite material by combining vacuum impregnation with reactive melt impregnation
  • Method for preparing SiCf/Si-Y-B-C composite material by combining vacuum impregnation with reactive melt impregnation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1. Sample with an infiltration temperature of 1300°C

[0041] Step 1. SiC f / SiC porous body preparation: A 500 nm-thick BN interfacial layer was deposited on the 2D stacked SiC fiber preform by the CVI process. The experiment used BCl 3 is boron source, NH 3 It is a nitrogen source, the deposition temperature is 650°C, and the pressure is 5kPa. Then a certain amount of SiC matrix is ​​deposited by the CVI process, using trichloromethylsilane (CH 3 SiCl 3 , referred to as MTS) as the gas source, using Ar as the dilution gas, high-purity H 2 As the carrier gas for MTS, the deposition temperature is 1000 °C, the pressure is 5 kPa, and the prepared density is about 2.0 g / cm 3 Porous SiC f / SiC.

[0042] Step 2. Slurry preparation: Dissolve 1 wt.% CMC dispersant (sodium carboxymethyl cellulose) in distilled water and heat in a water bath (at a constant temperature of 80° C.) to prepare a dispersion solution. After the solution was cooled, 40wt.% B was added...

Embodiment 2

[0045] Example 2. Sample with an infiltration temperature of 1400°C

[0046] Step 1. SiC f / SiC porous preform preparation: A 500 nm-thick BN interfacial layer was deposited on the 2D stacked SiC fiber preform using the CVI process. The experiment used BCl 3 is boron source, NH 3 It is a nitrogen source, the deposition temperature is 650°C, and the pressure is 5kPa. Then a certain amount of SiC matrix is ​​deposited by the CVI process, using trichloromethylsilane (CH 3 SiCl 3 , referred to as MTS) as the gas source, using Ar as the dilution gas, high-purity H 2 As the carrier gas for MTS, the deposition temperature is 1000 °C, the pressure is 5 kPa, and the prepared density is about 1.9 g / cm 3 Porous SiC f / SiC.

[0047] Step 2. Slurry preparation: Dissolve 1 wt.% CMC dispersant (sodium carboxymethyl cellulose) in distilled water and heat in a water bath (at a constant temperature of 80° C.) to prepare a dispersion solution. After the solution was cooled, 30wt.% of B ...

Embodiment 3

[0050] Example 3. Sample with an infiltration temperature of 1500°C

[0051] Step 1. SiC f / SiC porous body preparation: A 500 nm-thick BN interfacial layer was deposited on the 2D stacked SiC fiber preform by the CVI process. The experiment used BCl 3 is boron source, NH 3 It is a nitrogen source, the deposition temperature is 650°C, and the pressure is 5kPa. Then a certain amount of SiC matrix is ​​deposited by the CVI process, using trichloromethylsilane (CH 3 SiCl 3 , referred to as MTS) as the gas source, using Ar as the dilution gas, high-purity H 2 As the carrier gas for MTS, the deposition temperature is 1000°C, the pressure is 5kPa, and the prepared density is about 2.1g / cm 3 Porous SiC f / SiC.

[0052] Step 2. Slurry preparation: Dissolve 1 wt.% CMC dispersant (sodium carboxymethyl cellulose) in distilled water and heat in a water bath (at a constant temperature of 80° C.) to prepare a dispersion solution. After the solution was cooled, 30wt.% of B was added...

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Abstract

The invention relates to a method for preparing a SiCf/Si-Y-B-C composite material by combining vacuum impregnation with reactive melt impregnation, and belongs to the field of improvement of water and oxygen corrosion resistance and self-healing performance of the composite material. The method is technically characterized by comprising the steps of porous body preparation, slurry preparation, slurry impregnation and Si-Y alloy introduction through a reactive melt infiltration method. According to the method, the problems that the preparation process of the SiCf/Si-Y-B-C composite material is long in period and complex in process can be solved, and the water and oxygen corrosion resistance and the self-healing performance of the SiCf/SiC composite material are improved. The invention provides a new thought and process method for developing the preparation of the SiCf/Si-Y-B-C composite material by combining the vacuum impregnation with the RMI method. According to the preparation method disclosed by the invention, B4C slurry is introduced into the porous SiCf/SiC composite material by adopting vacuum impregnation, and then Si-Y alloy is introduced by adopting a reaction melt infiltration process to densify the material, so that the SiCf/Si-Y-B-C composite material is prepared. The method can solve the problems that the preparation process of the SiCf/Si-Y-B-C composite material is long in period and complex in process, and the water and oxygen corrosion resistance and the self-healing performance of the composite material are improved.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a kind of vacuum impregnation combined with reactive melt infiltration to prepare SiC f / Si-Y-B-C composite material method, which is mainly used to improve the toughening of silicon carbide fiber and silicon carbide ceramic matrix composite material (SiC f / SiC) in the field of water-oxygen corrosion resistance and self-healing properties. Background technique [0002] SiC f / SiC composite material has excellent properties such as low density, high specific strength, high specific modulus, high temperature resistance, oxidation resistance, wear resistance, corrosion resistance, etc., and overcomes the inherent poor toughness of ceramics, and has now become a high thrust-to-weight ratio engine. Preferred high temperature lightweight construction material. [0003] The working conditions of high-performance aero-engines are severe, which puts forward higher demands on the water...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/80C04B35/565C04B35/622C04B41/85
CPCC04B38/0029C04B35/80C04B35/565C04B35/622C04B41/85C04B41/515C04B41/009C04B2235/77C04B38/0067C04B41/5096C04B41/5058C04B41/4537C04B41/0072Y02E30/30
Inventor 刘永胜张冰慧高雨晴王晶董宁曹晔洁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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