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
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  • 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 mater

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

Examples

Experimental program
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Example Embodiment

[0031] Example 1

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

Example Embodiment

[0039] Example 2

[0040] Use CVI to prepare a layer of PyC continuous interfacial phase on the fiber surface of the flat three-dimensional braided carbon fiber preform with a total thickness of 130nm. Then use graphite tooling to fix its shape and immerse it in a xylene solution of polycarbosilane (PCS); After drying, the impregnated organic precursor is cracked in a vacuum furnace to convert it into a ceramic matrix. The cracking temperature is 900°C. After removing the tooling, a flat workpiece is obtained; again immersed in a xylene solution of polycarbosilane (PCS), and dried Cracking in a vacuum furnace at 900°C. After repeating the immersion-cracking process 7 times, the obtained flat workpiece is transferred to a CVI furnace, and SiC is prepared by CVI for further densification. The specific process parameters are: the deposition temperature is 960°C , The deposition pressure is 1kPa, the Ar gas flow rate is 5L / min, the hydrogen flow rate is 5L / min, the trichloromethylsil...

Example Embodiment

[0042] Example 3

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

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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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