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Preparation method of SiCf/SiC composite material with SiC coating layer

A composite material and coating technology, applied in the field of nuclear SiCf/SiC composite material preparation, can solve the problems affecting the hydrothermal corrosion resistance of SiC composite materials, low density of SiC composite materials, restricting the commercial application of SiC, etc. Controllable, improve hydrothermal corrosion resistance, and improve the effect of density

Pending Publication Date: 2019-03-01
NAT UNIV OF DEFENSE TECH
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  • Application Information

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Problems solved by technology

However, the preparation temperature of the traditional PIP process is low, and the obtained SiC f / SiC composites have disadvantages such as low density, poor crystallinity and purity, which affect the SiC f The hydrothermal corrosion resistance of SiC / SiC composite materials seriously restricts the SiC f Commercial Applications of SiC Composites in Advanced LWR

Method used

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  • Preparation method of SiCf/SiC composite material with SiC coating layer
  • Preparation method of SiCf/SiC composite material with SiC coating layer
  • Preparation method of SiCf/SiC composite material with SiC coating layer

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Embodiment 1

[0039] A SiC with SiC coating of this embodiment f / SiC composite material preparation method, comprises the following steps:

[0040] S1. Preparation of SiC fiber braided parts:

[0041] The domestic third-generation KD-S type SiC fiber with a chemical dosage ratio is close to the three-dimensional four-way (3D4d) weaving method to obtain a SiC fiber braid.

[0042] Preparation of S2, PyC interface coating:

[0043] Put the SiC fiber braid obtained in step S1 into a CVD furnace, and the raw material gas is C 3 h 6 , the carrier gas is high-purity argon, C 3 h 6 The flow rate is 2L·min -1 , the flow rate of argon gas is 2L·min -1 , the deposition temperature is 1000°C, the deposition pressure is 2000Pa, the deposition time is 2 hours, and the thickness of the PyC coating is about 200nm.

[0044] S3, PIP process densification:

[0045] S3-1. Densify the SiC fiber braid after the deposition of the PyC interface coating obtained in step S2 according to the following proc...

Embodiment 2

[0057] A SiC with SiC coating of this embodiment f The preparation method of the / SiC composite material is basically the same as that of Example 1, the only difference being that the cracking temperature in the densification process of the PIP process is 1600°C.

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Abstract

The invention discloses a preparation method of a SiCf / SiC composite material with a SiC coating layer. The preparation method comprises the following steps: S1, weaving SiC fiber into a SiC fiber weaving piece; S2, depositing a pyrolytic carbon interface coating layer on the surface of the SiC fiber of the SiC fiber weaving piece, thus obtaining a SiC fiber weaving piece with the interface coating layer; S3, carrying out densification treatment on the SiC fiber weaving piece with the interface coating layer through a precursor infiltration and pyrolysis technology, thus obtaining the SiCf / SiCcomposite material, wherein the temperature during pyrolysis is 1400 to 1800 DEG C; S4, depositing the SiC coating layer on the surface of the SiCf / SiC composite material through a CVD (Chemical Vapor Deposition) technology, thus obtaining a hydrothermal corrosion-resistant SiCf / SiC composite material with the SiC coating layer. The SiCf / SiC composite material with the SiC coating layer, preparedby the preparation method disclosed by the invention has hydrothermal corrosion resistance.

Description

technical field [0001] The present invention relates to nuclear SiC f / SiC composite material preparation technical field, especially relate to a kind of SiC with SiC coating f / SiC composite material preparation method. Background technique [0002] Energy is the basis for the development of human society, and the development of clean energy is the key to the sustainable development of human society. Nuclear energy has the advantages of less resource consumption, less environmental impact and strong supply capacity, and is a safe and reliable clean energy. At present, the form of international energy supply is becoming increasingly tense. In order to meet the needs of social development for energy and better protect the natural environment, nuclear energy has become a clean energy that countries around the world focus on. [0003] During the rapid development of nuclear energy, there are still a series of technical problems. Especially after the Fukushima Daiichi nuclea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/80C04B35/622
CPCC04B35/806C04B35/571C04B35/622C04B2235/5244C04B2235/614C04B2235/616C04B2235/9669
Inventor 王洪磊周新贵余金山谭瑞轩李明远黎畅葛斌
Owner NAT UNIV OF DEFENSE TECH
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