Preparation method of silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material

A technology of silicon carbide nanowires and composite materials, applied in the field of materials, to achieve uniform distribution, improve bending strength and fracture toughness, and avoid falling off

Active Publication Date: 2017-08-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to avoid the deficiencies of the prior art, the present invention proposes a silicon carbide nanowire reinforced C / C-SiC-ZrB 2 A method for preparing ceramic matrix composites, solving the problems of uniform distribution of silicon carbide nanowires inside the composite and improving the mechanics of the composite

Method used

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  • Preparation method of silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material
  • Preparation method of silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material
  • Preparation method of silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material

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Embodiment 1

[0032] Step 1: Put the carbon fiber preform in absolute ethanol and ultrasonically clean it for 20 minutes, and dry the cleaned carbon fiber preform at a temperature of 100°C for 10 hours for use;

[0033]Step 2: Preparation of porous C / C preforms. Place the carbon fiber preforms in an isothermal chemical vapor deposition furnace, use natural gas as a precursor, and deposit pyrolytic carbon to protect the carbon fiber preforms at 1100 ° C. The flow rate of natural gas is 80ml / min. The deposition time is 5 hours; after the deposition is completed, it is cooled with the furnace to obtain a porous C / C preform;

[0034] Step 3: Stir the absolute ethanol and tetraethyl orthosilicate solution evenly, then add a small amount of distilled water, ferrocene and hydrochloric acid, and stir evenly again to make a silica sol; the absolute ethanol, tetraethyl orthosilicate, The molar ratio of distilled water, ferrocene and hydrochloric acid is 3:1:5:0.01:0.2;

[0035] Step 4: Immerse the p...

Embodiment 2

[0040] Step 1: Put the carbon fiber preform in absolute ethanol and ultrasonically clean it for 20 minutes, and dry the cleaned carbon fiber preform at a temperature of 100°C for 10 hours for use;

[0041] Step 2: Preparation of porous C / C preforms. Place the carbon fiber preforms in an isothermal chemical vapor deposition furnace, use natural gas as a precursor, and deposit pyrolytic carbon to protect the carbon fiber preforms at 1100 ° C. The flow rate of natural gas is 80ml / min. The deposition time is 5 hours; after the deposition is completed, it is cooled with the furnace to obtain a porous C / C preform;

[0042] Step 3: Stir the absolute ethanol and tetraethyl orthosilicate solution evenly, then add a small amount of distilled water, ferrocene and hydrochloric acid, and stir evenly again to make a silica sol; the absolute ethanol, tetraethyl orthosilicate, The molar ratio of distilled water, ferrocene and hydrochloric acid is 3:1:5:0.01:0.2;

[0043] Step 4: Immerse the ...

Embodiment 3

[0048] Step 1: Put the carbon fiber preform in absolute ethanol and ultrasonically clean it for 20 minutes, and dry the cleaned carbon fiber preform at a temperature of 100°C for 10 hours for use;

[0049] Step 2: Preparation of porous C / C preforms. Place the carbon fiber preforms in an isothermal chemical vapor deposition furnace, use natural gas as a precursor, and deposit pyrolytic carbon to protect the carbon fiber preforms at 1100 ° C. The flow rate of natural gas is 80ml / min. The deposition time is 5 hours; after the deposition is completed, it is cooled with the furnace to obtain a porous C / C preform;

[0050] Step 3: Stir the absolute ethanol and tetraethyl orthosilicate solution evenly, then add a small amount of distilled water, ferrocene and hydrochloric acid, and stir evenly again to make a silica sol; the absolute ethanol, tetraethyl orthosilicate, The molar ratio of distilled water, ferrocene and hydrochloric acid is 3:1:5:0.01:0.2;

[0051] Step 4: Immerse the ...

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Abstract

The invention relates to a preparation method of a silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material. A pretreated carbon fiber prefabricating body is thermally treated to obtain a silicon carbide nanowire. The silicon carbide nanowire prepared by a sol-gel carbon-thermal reaction method is evenly distributed at the inner part of a porous carbon/carbon composite material. Subsequently, pyrolytic carbon deposited in an isothermal chemical vapor deposition furnace is coated at the surface of the silicon carbide nanowire, thus the dropping, growing and rupture of the silicon carbide nanowire in the following reaction and infiltration processes are effectively avoided. A ceramic-based composite material carbon fiber, a silicon carbide nanowire and a pyrolytic carbon middle layer after reaction and infiltration are not eroded by a high-temperature metal bath and are well preserved; thus the physical performance of the composite material can be improved. Compared with the C/C-SiC-ZrB2 ceramic-based composite material without adding the silicon carbide nanowire, the bending strength and the fracture toughness property of the silicon carbide nanowire enhanced C/C-SiC-ZrB2 ceramic-based composite material are improved by 26.9-41.3% and 45.2-59.1% respectively.

Description

technical field [0001] The invention belongs to the field of materials and relates to a silicon carbide nanowire reinforced C / C-SiC-ZrB 2 Preparation method of ceramic matrix composite material. Background technique [0002] With the development of new engines and the development of new concept space vehicles, traditional ceramic matrix composite materials can no longer meet the required performance indicators, and there is an urgent need to develop new composite materials with higher temperature resistance and longer life to meet the development of aerospace industry demand. Continuous carbon fiber reinforced C / C-SiC-ZrB 2 In addition to a series of excellent properties such as high temperature resistance, high specific strength, high specific modulus, and low thermal expansion coefficient, the composite material also has the characteristics of high density of the ceramic matrix, anti-ablation, thermal shock resistance, and good thermochemical stability. A new type of ul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/83C04B35/622
CPCC04B35/622C04B35/806C04B35/83C04B2235/3813C04B2235/3826C04B2235/5248C04B2235/614C04B2235/9676
Inventor 付前刚刘跃李贺军李克智林红娇王贝贝
Owner NORTHWESTERN POLYTECHNICAL UNIV
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