Preparation method of SiC composite material through in-situ reaction in fiber bundle

An in-situ reaction and composite material technology, applied in the field of preparation of fiber-reinforced ceramic matrix composite materials, can solve the problems of affecting the service life and reducing the high-temperature oxidation resistance of composite materials, so as to improve the degree of densification and increase the yield of high-temperature ceramics. The effect of ensuring uniformity

Active Publication Date: 2020-11-10
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 SiC composite material through in-situ reaction in fiber bundle
  • Preparation method of SiC composite material through in-situ reaction in fiber bundle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1. Evenly mix the high carbon residue polycarbosilane, SiC powder and silicon powder, 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 them 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 In the slot shown in (shown), pour the prepared 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 impregnate...

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 a preparation technology of a fiber-toughened ceramic-based composite material, and relates to a preparation method of a SiC composite material through in-situ reaction in fiber bundle The yield of the adopted high-carbon-residue polycarbosilane ceramic is high and exceeds 65%, and the stoichiometric ratios of C to Si in a matrix SiC formed after pyrolysis are 5:1 and 1:1respectively; the SiC powder and silicon powder are uniformly dispersed in high-carbon-residue polycarbosilane, so that the high-temperature ceramic yield of the precursor is further improved, and thein-situ reaction of a silicon element and a carbon element in a fiber bundle is promoted; in addition, a graphite tool is adopted to impregnate the unidirectional fiber bundles, the environments where the fiber bundles are located are basically consistent in the impregnation process, and the impregnation uniformity is guaranteed. Through a silicon-carbon in-situ reaction and an impregnation cracking process, a unidirectional fiber bundle is used as a reinforcing body, and the material is prepared through impregnation sintering. Finally, liquid polycarbosilane is used for secondary impregnation to form SiC ceramic, so that the densification degree of the material is improved.

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 of unit thrust of aero-engines, the outlet temperature of the combustion chamber of the engine has been greatly improved, and higher requirements have been placed on the materials of the hot-end components such as the combustion chamber, turbine and blades. 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 ° C compared with nickel-based supera...

Claims

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Application Information

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Patent Type & Authority Applications(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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