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Ultra-light C/C-SiC space reflector and preparation method and application thereof

A mirror, ultra-light technology, applied in the field of chemical materials, can solve the problems of large surface roughness, no successful application, etc., to achieve good quality, improve anti-oxidation and thermal shock resistance, and reduce cracks.

Active Publication Date: 2021-02-26
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2018, Changchun Institute of Optics and Mechanics successfully developed a 4-meter-diameter C / SiC composite mirror. This mirror is also the largest diameter and high-precision silicon carbide aspheric mirror publicly reported in the world, but it has not yet been successful. Applied coverage
[0010] However, due to the characteristics of porosity and large surface roughness caused by fibers, C / C composites are difficult to directly obtain mirror surfaces through optical polishing.

Method used

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  • Ultra-light C/C-SiC space reflector and preparation method and application thereof
  • Ultra-light C/C-SiC space reflector and preparation method and application thereof
  • Ultra-light C/C-SiC space reflector and preparation method and application thereof

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Embodiment 1

[0050]Such asfigure 1 As shown, this embodiment discloses an ultra-lightweight C / C-SiC space mirror, including a C / C composite material, a SiC gradient transition layer embedded on the surface of the C / C composite material, and a SiC gradient transition layer. The graphene-SiCNWs multi-dimensional hybrid enhanced CVD-SiC coating on the surface of the layer; the SiC gradient transition layer is abbreviated as PC-SiC, and the graphene-SiCNWs multi-dimensional hybrid enhanced CVD-SiC coating is abbreviated as G-SiCNWs- SiC, the graphene is abbreviated as G, and the SiCNWs are SiC nanowires.

[0051]This embodiment also discloses a method for preparing an ultra-lightweight C / C-SiC space mirror, which includes the following steps:

[0052](1) SiC gradient transition layer embedding method can be controlled

[0053]Take C powder and Si powder as main raw materials, add a small amount of Al2O3Permeation enhancer and ferrocene modifier, which are mixed powders, are embedded in the C / C composite mate...

Embodiment 2

[0070]An ultra-lightweight C / C-SiC space mirror, including C / C composite material, SiC gradient transition layer embedded on the surface of the C / C composite material, and graphene-SiCNWs multidimensional arranged on the surface of the SiC gradient transition layer Hybrid enhanced CVD-SiC coating; the SiC gradient transition layer is abbreviated as PC-SiC, the graphene-SiCNWs multi-dimensional hybrid enhanced CVD-SiC coating is abbreviated as G-SiCNWs-SiC, and the graphene is abbreviated as G, the SiCNWs are SiC nanowires.

[0071]The content of silicon in the SiC gradient transition layer gradually increases from the inside of the C / C composite material to the outer surface of the G-SiCNWs-SiC.

[0072]A preparation method of ultra-lightweight C / C-SiC space mirror includes the following steps:

[0073]S1, the embedding method can control the preparation of SiC gradient transition layer:

[0074]Embed the sample of C / C composite material in the mixed powder, the mixed powder includes C powder, ...

Embodiment 3

[0083]The difference between this embodiment and Embodiment 2 is only:

[0084]A preparation method of ultra-lightweight C / C-SiC space mirror includes the following steps:

[0085]S1, the embedding method can control the preparation of SiC gradient transition layer:

[0086]Embed the sample of C / C composite material in the mixed powder, the mixed powder includes C powder, Si powder, MgO penetration enhancer and ferrocene modifier; the mass ratio of C powder and Si powder is 3:1 , MgO penetration enhancer accounts for 8% by mass in the mixed powder, and ferrocene modifier accounts for 10% by mass in the mixed powder; after embedding, it is heated and reacted at a temperature of 2300°C for 3 hours to obtain a uniform structure SiC gradient transition layer, namely PC-SiC;

[0087]S2, G-SiCNWs can be prepared on the surface of PC-SiC:

[0088]Place the PC-SiC in the reaction zone of the CVD furnace, and then pass in H after vacuuming2And Ar, when the temperature of the reaction zone reaches the depos...

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Abstract

The invention discloses an ultra-light C / C-SiC space reflector, which comprises a C / C composite material, a SiC gradient transition layer embedded in the surface of the C / C composite material, and a graphene SiCNWs multi-dimensional hybrid enhanced CVD-SiC coating arranged on the surface of the SiC gradient transition layer. The invention also discloses an application of the preparation method ofthe ultra-light C / C-SiC space reflector. According to the method, the PC-SiC transition coating is prepared on the surface of the ultralight C / C composite material, the thermal stress generated by thermal expansion mismatch of the mirror CVD-SiC coating and the C / C matrix is reduced; besides, the graphene-wound SiC nanowire reinforcement grows on the surface of the embedded SiC coating through a one-step CVD method, that is, the interface bonding between SiCNWs and the CVD-SiC matrix is improved, and further the effect of the single SiCNWs reinforced CVDSiC optical coating is improved by virtue of the excellent mechanical property of the graphene.

Description

Technical field[0001]The invention relates to an ultra-lightweight C / C-SiC space mirror, a preparation method and application thereof, and belongs to the technical field of chemical materials.Background technique[0002]As the "eyes" of space vehicles, space cameras are of great significance in the field of aerospace, and countries around the world have also launched fierce competition in this field.[0003]Moreover, with the development of space application technology, higher and higher requirements are put forward for the launch load and the resolution of the space camera. In order to further reduce the launch cost and improve the resolution of the space camera, new optical mirrors are gradually developing in the direction of large aperture and light weight.[0004]Space optical remote sensing systems, such as space telescopes, remote sensing surveillance cameras, etc., have important scientific and military significance whether in the fields of earth observation or space exploration. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/08G02B1/10C04B41/89
CPCC04B41/009C04B41/52C04B41/89G02B1/10G02B5/08C04B41/5059C04B35/83
Inventor 强新发巴志新张保森巨佳李旋
Owner NANJING INST OF TECH
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