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Method for preparing coating reinforced C/SiC composite material

A composite material and coating technology, applied in the field of composite material preparation, can solve the problems of reduced material damping performance, reduced porosity of composite materials, etc., and achieve the effects of improving strength, toughness, improving compactness, and alleviating modulus mismatch

Active Publication Date: 2014-04-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This article involves the deposition of SiC coating on the surface of the sample, the porosity of the composite material is reduced, and the damping performance of the material is greatly reduced

Method used

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  • Method for preparing coating reinforced C/SiC composite material
  • Method for preparing coating reinforced C/SiC composite material
  • Method for preparing coating reinforced C/SiC composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1, preparing SiC whisker slurry, the specific process is:

[0032] (1) Use SiC whiskers with an aspect ratio of 8-11, use 20% alcohol as a solution, ultrasonicate for 30 minutes, and dry;

[0033] (2) The volume fraction of SiC whiskers is 30%, ethanol is used as solvent, triethyl phosphate is used as dispersant, and ball milling is carried out for 5 hours;

[0034] (3) in above-mentioned slurry, add PVB binding agent, glycerol plasticizer, ball mill 5h;

[0035] (4) Vacuum degassing for 20 minutes to prepare a stable SiC whisker slurry.

[0036] Step 2, prepare SiC whisker coating reinforced C / SiC composite material. The specific process is:

[0037] (1) A two-dimensional preform is prepared by laminating 1K plain weave carbon cloth, and the volume percentage of fibers is 40%;

[0038] (2) With propylene as the source material and argon as the dilution gas, the PyC interface was deposited by chemical vapor infiltration, the deposition temperature was 900 °C, a...

Embodiment 2

[0045] Step 1, prepare SiC particle slurry. The specific process is:

[0046] (1) SiC particles with a diameter of 0.5 μm are used as a solution with a volume fraction of 20% alcohol, ultrasonicated for 30 minutes, and dried;

[0047] (2) The volume fraction of SiC particles is 30%, ethanol is used as solvent, triethyl phosphate is used as dispersant, and ball milling is performed for 5 hours;

[0048] (3) in above-mentioned slurry, add PVB binding agent, glycerol plasticizer, ball mill 5h;

[0049] (4) Vacuum degassing for 20 minutes to prepare a stable SiC particle slurry.

[0050] Step 2, preparing SiC particle coating reinforced C / SiC composite material. The specific process is:

[0051](1) A two-dimensional preform is prepared by laminating 1K plain weave carbon cloth, and the volume percentage of fibers is 40%;

[0052] (2) With propylene as the source material and argon as the dilution gas, the PyC interface was deposited by chemical vapor infiltration, the deposit...

Embodiment 3

[0058] Embodiment 3: step 1, preparing (SiC whiskers+SiC particles) slurry. The specific process is:

[0059] (1) Use SiC whiskers with an aspect ratio of 8-11 and SiC particles with a diameter of 0.5 μm, and a mixed powder with a mass ratio of 2:1, use 20% alcohol as a solution, ultrasonic for 30 minutes, and dry ;

[0060] (2) The volume fraction of the powder is 30%, ethanol is the solvent, triethyl phosphate is the dispersant, and ball milled for 5 hours;

[0061] (3) in above-mentioned slurry, add PVB binding agent, glycerol plasticizer, ball mill 5h;

[0062] (4) Vacuum degassing for 20 minutes to prepare a stable (SiC whisker + SiC particles) slurry.

[0063] Step 2, preparing (SiC whisker + SiC particle) coating reinforced C / SiC composite material. The specific process is:

[0064] (1) A two-dimensional preform is prepared by laminating 1K plain weave carbon cloth, and the volume percentage of fibers is 40%;

[0065] (2) With propylene as the source material and ...

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Abstract

The invention relates to a method for preparing a coating reinforced C / SiC composite material. According to a technical scheme, a slurry coating layer is coated on a test sample surface of a C / SiC composite material to facilitate the filling of aperture gaps remained by a prefabricated body structure and aperture gaps caused by a chemical vapor infiltration bottle neck process, so that the compactness of the composite material is improved, the modulus mismatching between the C / SiC composite material and a SiC protective layer can be effectively relieved and the obdurability of the composite material is improved. Compared with the C / SiC composite material in the prior art, the coating reinforced C / SiC composite material has the advantages that the bending strength of the two-dimensional SiC crystal whisker coating layer reinforced C / SiC composite material is 480-502MPa under the room temperature, the bending strength of the two-dimensional SiC particle coating layer reinforced C / SiC composite material is 440-470MPa, and the bending strength of the two-dimensional (SiC crystal whisker and SiC particle) coating layer reinforced C / SiC composite material is 485-515MPa. The thicknesses of PyC and SiC basal bodies and a protective layer are controlled by controlling deposition time, and the thickness of the slurry coating layer is controlled by controlling the viscosity of the slurry and the coating time the number of coatings so as to realize the control of the composite material structure.

Description

technical field [0001] The invention belongs to a preparation method of a composite material, and relates to a preparation method of a coating-reinforced C / SiC composite material. Background technique [0002] C / SiC ceramic matrix composites overcome the shortcomings of low temperature resistance and high density of metal materials, high brittleness and poor reliability of ceramic materials, and have high temperature resistance, low density, high specific strength, high specific modulus, oxidation resistance, and ablation resistance. It is not sensitive to cracks and does not suffer from catastrophic damage, so it has broad application prospects in the aerospace field. With the development of aerospace technology, the demand for components made of C / SiC composite materials is increasing, which is characterized by many varieties, large quantities, and high requirements. Due to the different working conditions of the components, such as: the leading edge of the wing requires h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85C04B35/80C04B35/565C04B35/622
Inventor 成来飞张立同刘小瀛解玉鹏孟志新陈超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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