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High-density ceramic-based composite material and preparation method thereof

A composite material and ceramic-based technology, applied in the field of high-density ceramic-based composite materials and preparation, can solve the problems of insignificant effect, reduce the porosity of C/SiC composite materials, and reduce the porosity, so as to reduce the porosity and improve the porosity. Comprehensive performance and service life, the effect of improving bending strength

Active Publication Date: 2022-01-28
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to further reduce the porosity of C / SiC composites, low-molecular-weight polycarbosilane was used for PIP process at the end of the composite process, and the porosity was reduced to a certain extent, but the effect was not obvious

Method used

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  • High-density ceramic-based composite material and preparation method thereof
  • High-density ceramic-based composite material and preparation method thereof

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preparation example Construction

[0015] As described above, the present invention provides a method of preparing a highly density ceramic matrix composite material in the first aspect, the method comprising the steps of:

[0016] (1) The ceramic matrix composite material prepared by the PIP process is provided;

[0017] (2) Dilute polysili alkase using an organic solvent to obtain Si 3 N 4 Precursor solution;

[0018] (3) Adopting the Si 3 N 4 The precursor solution is sequentially impregnated, cured, and lysis step as a dipping liquid, to obtain a high-density ceramic matrix composite material.

[0019] In the present invention, the ceramic matrix composite material may, for example, a carbon fiber reinforced silicon carbide ceramic matrix composite (C / SiC ceramic matrix composite), carbon fiber reinforced silicon carbide-carbide ceramic matrix composite material (C / SiC-Zrc ceramic) Basic composite material); a ceramic matrix composite material prepared by a PIP method (prior disc transformation method) proc...

Embodiment 1

[0037] ① carbon fiber needled preform structure through PIP-SiC based process to obtain C / SiC composites.

[0038] ② After preparing molten silicon infiltration process conducted on the reaction process C / SiC composite material for processing, ultrasonic cleaning and dried after use. After cleaning the semifinished C / SiC composite density of 2.10g / cm 3 .

[0039] ③ using an organic solvent diluted with xylene Si3N4 precursor (polysilazane), prepared at a concentration of 20wt% of Si 3 N 4 Precursor solution.

[0040] ④ semifinished C / SiC composite Si3N4 impregnated precursor solution, the first vacuum impregnation, vacuum pressure gauge displaying ≤-0.095MPa, then the impregnation pressure, the pressure is 2.0MPa; followed by curing, curing temperature is 200 ℃, cure time was 3 hours; and finally in a nitrogen atmosphere for 6 hours 1000 ℃ cleavage.

[0041] Repeat step ④ ⑤ once, the optimized C / SiC composite, a density of 2.14g / cm 3 .

[0042] The resulting semifini...

Embodiment 2

[0044] In Example 1 using substantially the same manner, except that Si was diluted with an organic solvent of xylene 3 N 4 Precursor (polysilazane), prepared at a concentration of 5wt% of Si 3 N 4 Precursor solution.

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Abstract

The invention belongs to the technical field of thermal protection of composite materials, and provides a high-density ceramic-based composite material as well as a preparation method and application thereof. The method comprises the steps of (1) providing a ceramic-based composite material prepared by a PIP process; (2) diluting the polysilazane by adopting an organic solvent to obtain a Si3N4 precursor solution; and (3) adopting the Si3N4 precursor solution as impregnation liquid to sequentially carry out impregnation, curing and cracking steps on the ceramic-based composite material to obtain the high-density ceramic-based composite material. The invention also provides the composite material prepared by the method. According to the method disclosed by the invention, the mechanical properties of the ceramic-based composite material prepared by the PIP process can be optimized, and the tensile strength, bending strength and other mechanical properties are improved to a certain extent, so that the comprehensive properties of the ceramic-based composite material are improved.

Description

Technical field [0001] The present invention relates to the field of composite thermal protection technology, and more particularly to a highly dense ceramic matrix composite material and a preparation method. Background technique [0002] The ceramic matrix composite material has a low density, high temperature, high hardness, antioxidation, and excellent mechanical properties. As a high temperature heat structure material, it is widely used in the aerospace sector. Current ceramic matrix composite molding process methods have chemical meteorological penetration (CVI), prosthetic transformation (PIP) and reaction melt penetration (RMI). [0003] The PIP process has the advantages of high impregnation depth, and the product density gradient is advantage, but due to the polymented silicon from the PIP process, there is a large amount of small molecules overflow during the cleavage process, resulting in a large amount of holes in the inside, even after multiple times. The PIP proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/5066C04B41/009C04B41/4535C04B41/0072C04B35/80C04B35/565
Inventor 霍鹏飞金鑫李鹏鹏刘伟刘俊鹏于新民李晓东
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH