Preparation method of in-situ reaction sic composite material in a fiber bundle

An in-situ reaction and composite material technology is applied in the field of preparation of fiber toughened ceramic matrix composite materials. rate, the effect of ensuring uniformity

Active Publication Date: 2022-06-28
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a small amount of free Si (5vol%-20vol%) in the matrix prepared by this method, which reduces the high-temperature oxidation resistance of the composite material and even affects its service life

Method used

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  • Preparation method of in-situ reaction sic composite material in a fiber bundle
  • Preparation method of in-situ reaction sic composite material in a fiber bundle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1. Mix the high carbon residue polycarbosilane, SiC powder and silicon powder evenly, and mix them by ball milling for 2 hours to obtain a uniformly mixed liquid precursor slurry, high carbon residue polycarbosilane, SiC powder, and silicon powder. The weight ratio is 2:2:1;

[0033] Step 2, in a muffle furnace, in an air atmosphere, treat at 500°C for 4 hours to remove the sizing agent;

[0034] Step 3, depositing a pyrolytic carbon (PyC) interface layer on the surface of the fiber bundle, and then depositing a SiC interface layer with a thickness of 300 nm;

[0035] Step 4, the deposited fiber bundle is cut into a long section of 15cm, and evenly placed on the graphite tooling (such as figure 1 (shown), pour the prepared slurry into the slurry, the fibers are completely immersed in the slurry, put into a vacuum oven, and immersed in a vacuum for 2 hours to obtain a fiber precursor slurry;

[0036] Step 5. Take out the impregnated fiber bundles from the slurry, ...

Embodiment 2

[0041] Step 1. Evenly mix the high carbon residue polycarbosilane, SiC powder and silicon powder, and mix by ball milling for 3 hours to obtain a uniformly mixed liquid precursor slurry, high carbon residue polycarbosilane, SiC powder, and silicon powder. The weight ratio is 1:1:2;

[0042] Step 2, in a muffle furnace, in an air atmosphere, treat at 450 ° C for 2 hours to remove the sizing agent;

[0043] Step 3, depositing a pyrolytic carbon (PyC) interface layer on the surface of the fiber bundle, and then depositing a SiC interface layer, with thicknesses of 200 nm and 600 nm, respectively;

[0044] Step 4, the deposited fiber bundle is cut into a long section of 15cm, and evenly placed on the graphite tooling (such as figure 1 (shown), pour the prepared slurry into the slurry, the fibers are completely immersed in the slurry, put into a vacuum oven, and immersed in a vacuum for 3 hours to obtain a fiber precursor slurry;

[0045] Step 5. Take out the impregnated fiber bu...

Embodiment 3

[0050] Step 1. Mix the high carbon residue polycarbosilane, SiC powder and silicon powder evenly, and mix them by ball milling for 4 hours to obtain a uniformly mixed liquid precursor slurry, high carbon residue polycarbosilane, SiC powder, and silicon powder. The weight ratio is 5:1:4;

[0051] Step 2, in a muffle furnace, in an air atmosphere, treat at 500°C for 4 hours to remove the sizing agent;

[0052] Step 3, depositing a pyrolytic carbon (PyC) interface layer on the surface of the fiber bundle, and then depositing a SiC interface layer, with thicknesses of 300 nm and 400 nm, respectively;

[0053]Step 4, the deposited fiber bundle is cut into a long section of 15cm, and evenly placed on the graphite tooling (such as figure 1 (shown), pour the prepared slurry into the slurry, and the fibers are completely immersed in the slurry, put into a vacuum oven, and immersed in a vacuum for 5 hours to obtain a fiber precursor slurry;

[0054] Step 5. Take out the impregnated fi...

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Abstract

The invention belongs to the preparation technology of fiber-toughened ceramic-based composite materials, and relates to a preparation method of in-situ reaction SiC composite materials in fiber bundles; the yield of high-carbon residual polycarbosilane ceramics used in the invention is relatively high, all exceeding 65 %, the stoichiometric ratio of element C / Si in matrix SiC formed after pyrolysis is 5:1 and 1:1 respectively; SiC powder and silicon powder are evenly dispersed in high carbon residue polycarbosilane to further increase the high temperature of the precursor The yield of ceramics can promote the in-situ reaction of silicon and carbon elements in the fiber bundle; the graphite tool is used to impregnate the unidirectional fiber bundle, and the environment of the fiber bundle during the impregnation process is basically the same to ensure the uniformity of impregnation; Carbon in-situ reaction and impregnation cracking process, using unidirectional fiber bundles as reinforcements, made by impregnation and sintering. The second impregnation by liquid polycarbosilane forms SiC ceramics and increases the densification of the material.

Description

technical field [0001] The invention belongs to the preparation technology of fiber toughened ceramic matrix composite materials, and relates to a preparation method of in-situ reaction SiC composite materials in fiber bundles. Background technique [0002] With the increase in unit thrust of aero-engines, the outlet temperature of the engine combustion chamber has been greatly improved, and higher requirements have been placed on the materials of the combustion chamber, turbine and blades and other hot-end components. Traditional nickel-based superalloys have been difficult to meet the design requirements. operating requirements. Fiber-reinforced SiC ceramic matrix composites have excellent properties such as low density, high temperature resistance, oxidation resistance, and creep resistance. While reducing the types of components and reducing air consumption, the long-term service temperature can be increased by more than 200 ℃ compared with nickel-based superalloys, so i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/628C04B35/84
CPCC04B35/62863C04B2235/3826C04B2235/483C04B2235/428
Inventor 吕晓旭焦健姜卓钰齐哲高晔杨金华杨瑞
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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