A kind of preparation method of c/sic structure material with nearly zero expansion characteristic

A technology of structural materials and near-zero expansion, which is applied in the field of preparation of C/SiC structural materials, can solve the problems of lack of space for cushioning expansion, etc., and achieve the effects of reducing production costs, simple preparation process, and short cycle

Active Publication Date: 2022-07-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that there are fewer cracks inside the matrix, and there is a lack of buffer expansion space inside the material, which makes the material exhibit a high linear expansion coefficient.

Method used

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  • A kind of preparation method of c/sic structure material with nearly zero expansion characteristic
  • A kind of preparation method of c/sic structure material with nearly zero expansion characteristic
  • A kind of preparation method of c/sic structure material with nearly zero expansion characteristic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The plain carbon fiber cloth preform is used as the reinforcement, and the fiber volume content is 40%. The carbon interface phase is prepared on the surface of the preform fiber bundle by chemical vapor infiltration process and treated at high temperature. The surface of the fiber bundle is obtained. The carbon interface with a thickness of 150nm Floor. The silicon carbide substrate was prepared by chemical vapor infiltration process, the deposition temperature was 1000 °C, and the deposition time was 200 h. Then, the fiber preform is infiltrated with carbon powder by the slurry infiltration process, and the silicon carbide matrix is ​​quickly prepared by the chemical vapor infiltration process. The melt reaction temperature is 1450 ° C and the holding time is 2 hours. Finally, a 0.1mm silicon carbide coating was prepared on the surface of the material by chemical vapor deposition process. The obtained ceramic matrix composite has a density of 2.1 g / cm 3 , the porosi...

Embodiment 2

[0034] The plain carbon fiber cloth layup preform was used as the reinforcement, and the fiber volume content was 40%. The carbon interface phase was prepared on the surface of the preform fiber bundle by chemical vapor infiltration process and treated at high temperature. The surface of the fiber bundle obtained a carbon interface with a thickness of 300 nm. Floor. The silicon carbide substrate was prepared by chemical vapor infiltration process, the deposition temperature was 1000 °C, and the deposition time was 300 h. Then, the fiber preform is infiltrated with boron carbide powder by the slurry infiltration process, and the silicide matrix is ​​quickly prepared by the reactive melt infiltration process. The melt reaction temperature is 1500 ° C and the holding time is 60 minutes. Finally, a 0.05mm silicon carbide coating was prepared on the surface of the material by chemical vapor deposition process. The obtained ceramic matrix composite has a density of 2.2 g / cm 3 , th...

Embodiment 3

[0036] The plain carbon fiber cloth layup preform was used as the reinforcement, and the fiber volume content was 40%. The carbon interface phase was prepared on the surface of the preform fiber bundle by chemical vapor infiltration process and treated at high temperature. The surface of the fiber bundle obtained a carbon interface with a thickness of 400 nm. Floor. The silicon carbide substrate was prepared by chemical vapor infiltration process, the deposition temperature was 1000 °C, and the deposition time was 150 h. Then, the fiber preform is infiltrated with silicon carbide powder through the slurry infiltration process, and the silicide matrix is ​​quickly prepared by the reactive melt infiltration process. The melt reaction temperature is 1600 ° C, and the holding time is 40 minutes. The CVD process is used to prepare the surface of the material. 0.1mm silicon carbide coating. The obtained ceramic matrix composite has a density of 2.3 g / cm 3 , the porosity is 7%. f...

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Abstract

The invention relates to a preparation method of a C / SiC structural material with near-zero expansion characteristics. Continuous carbon fibers are prepared into fiber preforms, the fiber volume fraction of which is greater than or equal to 40%. The pyrolytic carbon interface layer was prepared and treated at high temperature. The chemical vapor infiltration process (CVI) was used to deposit 13-18% volume fraction of silicon carbide on the surface of the interface phase. The slurry infiltration combined with the reactive melt infiltration process (RMI) was used to rapidly prepare many Phase ceramic substrate, and finally prepare silicon carbide coating by chemical vapor deposition (CVD) process for surface sealing. Advantages: (1) The linear expansion coefficient of the existing ceramic matrix composite material is greatly reduced, and the linear expansion coefficient of the ceramic matrix composite material prepared by this method is close to zero (less than 1×10 ‑7 / K); (2) effectively improve the uniformity and density of the composite material; (3) shorten the material preparation cycle.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic matrix composite materials, and relates to a preparation method of a C / SiC structural material with near-zero expansion characteristics. Specifically, the continuous carbon fiber tow is used to prepare the preform, the chemical vapor infiltration process is used to prepare the interface phase on the surface of the fiber tow, the chemical vapor infiltration process is used to deposit a certain content of silicon carbide on the outer surface of the interface phase, and the slurry is infiltrated to bond The reactive melt infiltration process quickly prepares the silicide ceramic substrate, and finally the silicon carbide coating is prepared by the chemical vapor deposition process. This method greatly reduces the linear expansion coefficient of the existing ceramic matrix composite materials, and the linear expansion coefficient of the C / SiC structural material prepared by this method is close to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622C04B41/87
CPCC04B35/565C04B35/622C04B41/5059C04B41/87C04B2235/5248C04B2235/614C04B2235/96
Inventor 范晓孟赵东林陈超殷小玮党潇琳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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