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Radial nanowires grown on the surface of a c/c-si composite material and its preparation method at room temperature

A composite material and surface growth technology, which is used in the field of growing radial nanowires on the surface of C/C-Si composite materials and the preparation at room temperature, can solve the mechanical property damage of carbon/carbon composite materials, small binding force, and nanowires. easy to fall off

Active Publication Date: 2020-11-06
无锡博智复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is an important defect in the application of carbon / carbon composites: these excellent high-temperature properties can only be maintained when protected by an inert atmosphere or below 450 °C.
Its binding force is small, and the prepared nanowires are easy to fall off when subjected to external force.
Moreover, the nanowires are prepared by reaction at high temperature, and multiple high-temperature treatments cause great damage to the mechanical properties of carbon / carbon composites.

Method used

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  • Radial nanowires grown on the surface of a c/c-si composite material and its preparation method at room temperature
  • Radial nanowires grown on the surface of a c/c-si composite material and its preparation method at room temperature
  • Radial nanowires grown on the surface of a c/c-si composite material and its preparation method at room temperature

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1: Pretreatment of Carbon / Carbon Composite

[0043] Set the density to 1.74g / cm 3 The carbon / carbon composite materials were polished and polished with No. 180, No. 320 and No. 400 sandpaper in sequence, then ultrasonically cleaned with water and absolute ethanol for 30 minutes, and dried in an 80°C drying oven for 12 hours for later use;

[0044] Step 2: Preparation of Si coating on carbon / carbon composite surface

[0045] 1) Weigh respectively Si powder with a mass percentage of 90%, 10% Al 2 o 3 powder, placed in a turpentine ball ink tank, ball milled for 4 hours, and dried in an 80°C drying oven for 12 hours before use;

[0046] 2) Spread the mixed powder prepared in 1) in the graphite crucible, the thickness of the powder is about 1 / 2 of the height of the graphite crucible. Then put the pretreated carbon / carbon composite material into a graphite crucible, and then cover the carbon / carbon composite material with mixed powder, the thickness of which is abou...

Embodiment 2

[0063] Step 1: Pretreatment of Carbon / Carbon Composite

[0064] Set the density to 1.72g / cm 3 The carbon / carbon composite materials were polished and polished with No. 180, No. 320 and No. 400 sandpaper in sequence, then ultrasonically cleaned with water and absolute ethanol for 35 minutes, and dried in an 80°C drying oven for 24 hours for later use;

[0065] Step 2: Preparation of Si coating on carbon / carbon composite surface

[0066] 1) Take by weight respectively Si powder with mass percentage of 85%, Al with 15% 2 o 3 powder, placed in a turpentine ball ink tank, ball milled for 3 hours, dried in a 70°C drying oven for 24 hours, and then used;

[0067] 2) Spread the mixed powder prepared in 1) in the graphite crucible, the thickness of the powder is about 1 / 2 of the height of the graphite crucible. Then put the pretreated carbon / carbon composite material into a graphite crucible, and then cover the carbon / carbon composite material with mixed powder, the thickness of wh...

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Abstract

The invention relates to a radicalized nanowire growing on the surface of a C / C-Si composite material and a preparation method at the room temperature. An embedding method is adopted to prepare a silicon coating on the surface of a carbon / carbon composite material in a vacuum heating furnace, after the C / C-Si composite material is soaked by adopting a concentrated sulfuric acid and hydrogen peroxide mixed solution, the surface of the C / C-Si composite material is put into a monodisperse polystyrene microsphere solution, and after drying is carried out, metal spraying is carried out in a metalspraying sputtering instrument; then the C / C-Si composite material is put into a mixed solution composed of deionized water, glycerol, hydrogen peroxide and hydrofluoric acid by volume and etched at different time, and a Si nanowire growing radially on the surface of the C / C-Si composite material at the room temperature. The nanowire is the radicalized nanowire growing from the surface of the C / C-Si composite material, the binding force between an internal coating and an external coating can be improved, the thermal expansion mismatch is relieved, the decline of the mechanical performance caused by high-temperature processing for multiple times on the carbon / carbon composite material can be reduced, so that the carbon / carbon composite material can be effectively protected.

Description

technical field [0001] The invention belongs to coating surface nanowires and a preparation method thereof, and relates to a C / C-Si composite material surface growing radial nanowires and a preparation method at normal temperature. Background technique [0002] Carbon / carbon (C / C) composites have a series of excellent properties, such as low density, corrosion resistance, high specific strength, stable friction coefficient, and good thermal and electrical conductivity. In a high temperature environment, its strength increases with the increase of temperature, so that it can be successfully used as a high temperature structural composite material in an environment above 2000 °C. However, there is an important defect in the application of carbon / carbon composites: these excellent high-temperature properties can only be maintained under the protection of an inert atmosphere or below 450 °C. In an aerobic environment, when the temperature is higher than 450 °C, the carbon / carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/83C04B41/5096C04B41/4545C04B41/526
Inventor 郭领军霍彩霞王昌聪周磊李凯娇
Owner 无锡博智复合材料有限公司
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