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A kind of preparation method of fiber reinforced silicon carbide ceramic matrix composite material

A technology of silicon carbide ceramic matrix and composite materials, which is applied in the field of ceramic matrix composite materials and ceramic matrix composite materials for space optical systems. Efficiency reduction and other issues, to achieve the effect of shortening the densification cycle, reducing the difficulty of processing, and reducing the coefficient of thermal expansion

Active Publication Date: 2015-02-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fiber-reinforced ceramic matrix composites prepared by this method have the disadvantages of low degree of crystallization of the matrix and poor bonding force; and, when the composite material is densified to a certain extent, especially for larger composite materials or components, dipping - The pyrolysis efficiency is reduced, and the densification efficiency is reduced. In order to obtain a high-density composite material, it is necessary to use multiple organic precursor impregnation-pyrolysis cycles to achieve densification of the composite material, which prolongs the preparation time of the composite material
At the same time, using this method to stabilize the shape of the fiber preform, such as the lack of interfacial phases on the fiber surface, may deteriorate the mechanical properties of the prepared fiber-reinforced ceramic matrix composites

Method used

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  • A kind of preparation method of fiber reinforced silicon carbide ceramic matrix composite material
  • A kind of preparation method of fiber reinforced silicon carbide ceramic matrix composite material
  • A kind of preparation method of fiber reinforced silicon carbide ceramic matrix composite material

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Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a layer of PyC continuous interfacial phase was prepared on the fiber surface of the flat three-dimensional braided carbon fiber preform by CVI, the total thickness of the interfacial phase was 100nm, and then its shape was fixed by graphite tooling, impregnated with polycarbosilane (PCS) Toluene solution; after drying, the impregnated organic precursor is cracked in a vacuum furnace and converted into a ceramic matrix at a cracking temperature of 900 ° C. After removing the tooling, a flat workpiece is obtained; again impregnated with a xylene solution of polycarbosilane (PCS) , after drying, it was cracked in a vacuum furnace at 900 ° C. After repeating the impregnation-cracking process 7 times, the obtained flat workpiece was transferred to a CVI furnace, and SiC was prepared by CVI for further densification. The specific process parameters are: deposition temperature The temperature is 960°C, the deposition pressure is 1kPa, the flow rate ...

Embodiment 2

[0040]Using CVI to prepare a layer of PyC continuous interface phase on the fiber surface of the flat three-dimensional braided carbon fiber preform, the total thickness of the interface phase is 130nm, and then use graphite tooling to fix its shape and impregnate polycarbosilane (PCS) xylene solution; After drying, crack the impregnated organic precursor in a vacuum furnace and convert it into a ceramic matrix. The cracking temperature is 900°C. Crack in a vacuum furnace at 900°C. After repeating the impregnation-cracking process 7 times, transfer the obtained flat workpiece to a CVI furnace, and use CVI to prepare SiC for further densification. The specific process parameters are: the deposition temperature is 960°C , the deposition pressure is 1kPa, the flow rate of Ar gas is 5L / min, the flow rate of hydrogen gas is 5L / min, the flow rate of trichloromethylsilane is 1L / min, and the deposition time is 34h.

[0041] The bending strength of the three-dimensional carbon fiber re...

Embodiment 3

[0043] Using CVI to prepare a layer of PyC / SiC continuous interface phase on the fiber surface of the flat three-dimensional braided carbon fiber preform, the total thickness of the interface phase is 130nm, and then use graphite tooling to fix its shape and impregnate polycarbosilane (PCS) in xylene solution; after drying, the impregnated organic precursor is cracked in a vacuum furnace and converted into a ceramic matrix at a cracking temperature of 900 ° C. After removing the tooling, a flat workpiece is obtained; again, the xylene solution of polycarbosilane (PCS) is impregnated, After drying, it was cracked in a vacuum furnace at 900 ° C. After repeating the impregnation-cracking process 7 times, the obtained flat workpiece was transferred to a CVI furnace, and SiC was prepared by CVI for further densification. The specific process parameters are: the deposition temperature is 960°C, the deposition pressure is 1kPa, the flow rate of Ar gas is 5L / min, the flow rate of hydro...

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Abstract

The invention proposes a method for preparing a fiber-reinforced silicon carbide ceramic-based composite material, which includes the following steps: using chemical vapor infiltration to deposit one or more layers of continuous interface phases on the fibers of the fiber preform; using a ceramic organic precursor solution to impregnate and deposit The fiber preform with interfacial phase; the impregnated fiber preform is cracked in a vacuum furnace to form a silicon carbide-based composite material matrix; the fiber preform with stable shape obtained in the above steps is removed from the tooling to obtain a molded body; After the body is impregnated with the organic precursor solution and dried, it is cracked in a vacuum furnace and transformed into a ceramic matrix; the above steps are repeated 6 to 8 times to obtain a relatively dense shaped body; the obtained material is further densified by chemical vapor infiltration. The above method is conducive to the preparation of fiber-reinforced ceramic matrix composite materials or components with complex shapes, and the obtained materials have good thermal shock resistance, and at the same time, the ceramic matrix has the characteristics of high bonding strength.

Description

technical field [0001] The invention relates to a preparation method of a fiber-reinforced silicon carbide ceramic-based composite material, which belongs to the field of ceramic-based composite materials, in particular to the field of ceramic-based composite materials for space optical systems. Background technique [0002] Fiber-reinforced ceramic matrix composites have the characteristics of low density, high strength, and good high temperature stability. They are promising structural materials and have broad application prospects in aviation, aerospace and other fields. [0003] In order to obtain fiber-reinforced ceramic matrix composites with excellent performance, a specific interface phase is usually applied between the fiber surface and the ceramic matrix to weaken the bonding force between the fiber reinforcement and the ceramic matrix and prevent the fiber-reinforced ceramic matrix composite from appearing similar to a single phase. Brittle fracture phenomenon of ...

Claims

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Application Information

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IPC IPC(8): C32C16/42C32C16/32C04B35/80
Inventor 张翔宇董绍明高乐丁玉生何平王震周海军
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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