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A sic with co-deposited multiphase interface f /sic composite material preparation method

A composite material and phase interface technology, which is applied in the field of nuclear industry composite materials, can solve the problems of low toughening efficiency and difficult control of multi-layer interfaces, and achieve the effects of easy control of preparation, improvement of strength and toughness, and high preparation efficiency

Active Publication Date: 2021-09-28
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the toughening efficiency of (PyC / SiC)n multilayer interface is not high and the problem that the preparation is not easy to control, the present invention provides a method to solve the above problems by using the CVI process to prepare (PyC-SiC) containing (PyC-SiC) SiC at the multiphase interface f / SiC Composite Fabrication Method

Method used

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  • A sic with co-deposited multiphase interface <sub>f</sub> /sic composite material preparation method
  • A sic with co-deposited multiphase interface <sub>f</sub> /sic composite material preparation method
  • A sic with co-deposited multiphase interface <sub>f</sub> /sic composite material preparation method

Examples

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Effect test

Embodiment 1

[0023] Preparation of SiC with PyC-SiC Multiphase Interface f / SiC composite material, the specific preparation method is:

[0024] Step 1, prepare the SiC fiber preform: use the SiC fiber to weave the composite material preform to obtain the SiC fiber preform that meets the required structural form of the sample;

[0025] Step 2, interface deposition: place the SiC fiber preform in a chemical vapor deposition furnace to start co-deposition to obtain a multiphase interface. The reaction gas system used is: SiCl 3 CH 3 -H 2 -C 3 h 6 - Ar, SiCl 3 CH 3 Used as SiC source gas, C 3 h 6 As a carbon source gas, the flow ratio of propylene to carrier gas hydrogen is 5, the flow ratio of diluted hydrogen to carrier gas hydrogen is 4, the flow ratio of diluted argon to diluted hydrogen is 2, the deposition temperature is 1000 °C, and the deposition pressure is 100 ~150Pa, deposition time is 40~45min;

[0026] Step 3: Place the SiC fiber prefabricated body with the prepared mul...

Embodiment 2

[0028] Preparation of SiC with PyC-SiC Multiphase Interface f / SiC composite material, the specific preparation method is:

[0029] Step 1, prepare the SiC fiber preform: use the SiC fiber to weave the composite material preform to obtain the SiC fiber preform that meets the required structural form of the sample;

[0030] Step 2, interface deposition: place the SiC fiber preform in a chemical vapor deposition furnace to start co-deposition to obtain a multiphase interface. The reaction gas system used is: SiCl 3 CH 3 -H 2 -C 3 h 6 - Ar, SiCl 3 CH 3 Used as SiC source gas, C 3 h 6 As a carbon source gas, the flow ratio of propylene to carrier gas hydrogen is 7, the flow ratio of diluted hydrogen to carrier gas hydrogen is 6, the flow ratio of diluted argon to diluted hydrogen is 4, the deposition temperature is 950 °C, and the deposition pressure is 250 ~300Pa, the deposition time is 50~55min;

[0031] Step 3: Place the SiC fiber prefabricated body with the prepared ...

Embodiment 3

[0033] Preparation of SiC with PyC-SiC Multiphase Interface f / SiC composite material, the specific preparation method is:

[0034] Step 1, prepare the SiC fiber preform: use the SiC fiber to weave the composite material preform to obtain the SiC fiber preform that meets the required structural form of the sample;

[0035] Step 2, interface deposition: place the SiC fiber preform in a chemical vapor deposition furnace to start co-deposition to obtain a multiphase interface. The reaction gas system used is: SiCl 3 CH 3 -H 2 -C 3 h 6 - Ar, SiCl 3 CH 3 Used as SiC source gas, C 3 h 6 As a carbon source gas, the flow ratio of propylene to carrier gas hydrogen is 10, the flow ratio of diluted hydrogen to carrier gas hydrogen is 9, the flow ratio of diluted argon to diluted hydrogen is 5, the deposition temperature is 1200 °C, and the deposition pressure is 850 ~900Pa, the deposition time is 55~60min;

[0036] Step 3: Place the SiC fiber prefabricated body with the prepared ...

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Abstract

The invention discloses a SiC containing co-deposited multi-phase interface f / SiC composite material preparation method, comprising the following steps: adopting CVI process to carry out interface deposition on SiC fiber prefabricated body, using propylene as carbon source gas and trichloromethylsilane as silicon carbide source gas for co-deposition; carrier gas is hydrogen, The dilution gas is argon and hydrogen; the SiC matrix is ​​deposited on the SiC fiber preform that has completed the interface deposition by using the CVI process. The silicon carbide source gas is trichloromethylsilane, the carrier gas is hydrogen, and the dilution gas is argon and hydrogen. Prepared SiC f / SiC composite material, between the fiber and the matrix is ​​a PyC-SiC multi-phase interface, and the PyC-SiC multi-phase interface is a multi-phase interface formed by co-deposition and composed of SiC nanocrystals and pyrolytic carbon phase PyC. The preparation method provided by the present invention mainly includes two main steps of preparing the PyC-SiC multiphase interface by CVI co-deposition and densification of the SiC matrix. The preparation of the interface is easier to control and the preparation efficiency is also higher; the prepared SiC f The strength and toughness of / SiC composites are further improved.

Description

technical field [0001] The invention relates to the technical field of nuclear industry composite materials, in particular to a SiC containing co-deposited multi-phase interface f / SiC composite material preparation method. Background technique [0002] SiC f / SiC composite materials have many excellent properties such as high strength, high modulus, low density, high temperature resistance, impact resistance, oxidation resistance, creep resistance, ablation resistance, and radiation resistance, and have broad applications in aerospace and nuclear energy fields. prospect. The interface between the fiber and the matrix is ​​a key factor determining the performance of the composite material, and its optimization is still to improve the SiC f The main means of mechanical properties of SiC / SiC composites. [0003] Currently, SiC f The interfacial phases of / SiC composites mainly include BN, PyC, PyC / SiC and BN / SiC multilayer interfaces. However, under neutron irradiation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/577C04B35/80C04B35/628
CPCC04B35/565C04B35/622C04B35/62863C04B35/62873C04B2235/5244C04B2235/614
Inventor 何宗倍张瑞谦付道贵李鸣邱绍宇陶涛何琨
Owner NUCLEAR POWER INSTITUTE OF CHINA
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