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A kind of SIC foam and preparation method thereof

A technology of foam and carbon foam, which is applied in the field of SiC foam and its preparation, can solve the problems of easy cracking and collapse, and achieve the effects of reducing the difficulty of sealing holes, dense surface coating and improving toughness

Active Publication Date: 2021-10-15
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the coating prepared by this method is thick and dense, it can prevent the continuous weight gain of SiC foam when it is used. Prone to cracking, collapse and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of carbon foam matrix: pyrolyze the epoxy resin foam doped with 0.5% and fiber length of 0.5mm, the cracking procedure is as follows: heat up to 200°C at a rate of 100°C / h, and keep it warm for 1 hour; Heat up to 400°C at a rate of 50°C / h and hold for 1 hour; heat up to 800°C at a rate of 50°C / h and hold for 1 hour; heat up to 1100°C at a rate of 100°C / h and hold for 1 hour; heat at 100°C After cooling down to 800°C at a rate of / h, cool down to room temperature naturally.

[0038] (2) Machining: The carbon matrix foam is machined to form a cube with rounded corners.

[0039] (3) Cleaning: Use cotton cloth and alcohol to wipe off the dust on the surface of the foam.

[0040] (4) SiC coating deposition: Put the cleaned foam into a chemical vapor deposition furnace for silicon carbide deposition. The flow rate of trichloromethylsilane should be controlled at 1600g / h per cubic meter of reaction chamber; the deposition temperature is 1050°C. A total of 4 d...

Embodiment 2

[0043] (1) Preparation of carbon foam matrix: pyrolyze phenolic resin foam doped with 0.5% and fiber length of 0.5mm, the cracking procedure is as follows: heat up to 200°C at a rate of 100°C / h, keep it warm for 1 hour; Raise the temperature to 400℃ at the rate of ℃ / h and keep it for 1 hour; raise the temperature to 800℃ at the rate of 50℃ / h and keep it for 1 hour; raise the temperature to 1100℃ at the rate of 100℃ / h and keep it for 1 hour; After cooling down to 800°C at a rate of h, cool down to room temperature naturally.

[0044] (2) Machining: The carbon matrix foam is machined to form a cube with rounded corners.

[0045] (3) Cleaning: Use cotton cloth and alcohol to wipe off the dust on the surface of the foam.

[0046](4) SiC coating deposition: Put the cleaned foam into a chemical vapor deposition furnace for silicon carbide deposition. The flow rate of trichloromethylsilane should be controlled at 1600g / h per cubic meter of reaction chamber; the deposition temperatur...

Embodiment 3

[0049] (1) Preparation of carbon foam matrix: pyrolyze phenolic resin foam doped with 4% and fiber length of 0.5mm, the cracking procedure is as follows: heat up to 200°C at a rate of 100°C / h, and keep warm for 1 hour; Raise the temperature to 400℃ at the rate of ℃ / h and keep it for 1 hour; raise the temperature to 800℃ at the rate of 50℃ / h and keep it for 1 hour; raise the temperature to 1100℃ at the rate of 100℃ / h and keep it for 1 hour; After cooling down to 800°C at a rate of h, cool down to room temperature naturally.

[0050] (2) Machining: The carbon matrix foam is machined to form a cube with rounded corners.

[0051] (3) Cleaning: Use cotton cloth and alcohol to wipe off the dust on the surface of the foam.

[0052] (4) SiC coating deposition: Put the cleaned foam into a chemical vapor deposition furnace for silicon carbide deposition. The flow rate of trichloromethylsilane should be controlled at 1600g / h per cubic meter of reaction chamber; the deposition temperatur...

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Abstract

The invention proposes a SiC foam and a preparation method thereof, which are composed of a carbon foam matrix and a SiC coating. The carbon foam matrix is ​​obtained by pyrolysis of a resin foam, and the resin foam contains evenly distributed chopped fibers. The SiC foam prepared by the invention has low density, high strength and dense surface coating, and less weight gain when used as a C / SiC composite material to produce built-in tooling.

Description

technical field [0001] The invention relates to a SiC foam and a preparation method thereof, belonging to the technical field of C / SiC composite materials. Background technique [0002] With the development of science and technology, C / SiC composite materials have attracted more and more attention due to their excellent high temperature resistance, oxidation resistance and friction resistance, and are widely used in aerospace, aviation, metallurgy, automobile and other industries. C / SiC composite materials use carbon fiber as the toughening body and silicon carbide as the matrix. During the molding process, in order to prevent product deformation, it is necessary to design reasonable anti-deformation tooling. [0003] Tooling usually uses materials such as graphite and low-density C / C composite materials. The above materials have excellent temperature resistance and similar thermal expansion coefficients, but due to their high density and heavy weight, the tooling needs to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/80C04B35/524C04B38/06C04B41/87
Inventor 霍鹏飞刘俊鹏李鹏鹏李晓东
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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