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Reflection mirror with honeycomb sandwiched structure silicon carbide base composite material and its preparation method

A technology of honeycomb interlayer and composite material, which is applied in the field of preparation of silicon carbide-based composite material mirrors of honeycomb interlayer structure, can solve the problems such as difficulty in preparing high-rigidity honeycomb structure, difficulty in lightweight processing, lack of potential for weight reduction, etc. Achieve excellent machinability, reduce surface defects, and obtain easy results

Inactive Publication Date: 2007-10-24
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiC material is difficult to lightweight due to its high hardness
4. It is difficult to prepare a high-rigidity honeycomb structure, and there is no potential for further weight reduction

Method used

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  • Reflection mirror with honeycomb sandwiched structure silicon carbide base composite material and its preparation method
  • Reflection mirror with honeycomb sandwiched structure silicon carbide base composite material and its preparation method
  • Reflection mirror with honeycomb sandwiched structure silicon carbide base composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] As shown in Figures 1, 2, and 3, the honeycomb sandwich structure silicon carbide-based composite reflector of the present invention is bonded by an upper cover plate 1, a honeycomb interlayer 2 with a honeycomb structure, and a lower cover plate 3, and then siliconized and sintered into a whole . Its preparation process is as follows:

[0033] Step 1, preparation of C / C porous green body

[0034] The carbon felt was impregnated with an ethanol solution of phenolic resin, and after pressure curing at 150°C, it was carbonized in a cracking furnace (temperature 1000°C, time 1 hour, heating rate 5°C / min), and the impregnation-cracking process was repeated 5 times to obtain C / C porous green body, the density of the green body is 1.1g / cm 3 , porosity 35vol%.

[0035] Step 2, preparation of C / C honeycomb structure prefabricated parts

[0036] Use CNC machine tools to process porous C / C blanks to the required shape of the upper cover plate 1, the lower cover plate 3, and t...

Embodiment 2

[0045] Step 1, preparation of C / C porous green body

[0046] Fully mix and disperse chopped carbon fiber and ethanol solution of phenolic resin, pressurize and solidify at 200°C, and then carbonize in a cracking furnace (temperature 900°C, time 1 hour, heating rate 1°C / min) to obtain C / C Porous green body, repeat the impregnation-cracking process 5 times, the density can be 1.3g / cm 3 The C / C bisque.

[0047] Steps 2, 3, 4, and 5 are the same as steps 2, 3, 4, and 5 in Example 1.

Embodiment 3

[0049] Steps 1 and 2 are the same as steps 1 and 2 in Example 1.

[0050]Step 3. Silicon infiltration and sintering of honeycomb sandwich structure SiC mirror body

[0051] Put the C / C honeycomb sandwich structure preform into a graphite crucible containing silicon powder, heat it in a high-temperature vacuum furnace to 1600°C, and keep the vacuum state in the furnace for 0.5 hours, thereby preparing C / Si / SiC with a honeycomb sandwich structure Mirror body.

[0052] Steps 4 and 5 are the same as steps 4 and 5 in Example 1.

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Abstract

The present invention relates to a silicon carbide base composite material reflector with honeycomb sandwich structure. It is characterized by that after the upper cover plate, sandwich layer with honeycomb structure and lower cover plate are bonded, then they are undergone the processes of siliconing and sintering treatment so as to obtain the invented reflector whole body with the characteristics of light weight, high rigidity and good workability, etc. Besides, said invention also provides its preparation method and concrete steps.

Description

technical field [0001] The invention relates to the preparation of SiC-based composite mirrors based on lightweight high-resolution optical systems (surface roughness less than 1 nanometer). In particular, it relates to the preparation process of a honeycomb sandwich structure SiC-based composite reflector for a lightweight high-resolution optical system. Background technique [0002] With the development of science and technology and people's continuous understanding of the universe, people's development fields have shifted from the ground to space. Scientists from all over the world are constantly devoting themselves to space development activities, especially space reconnaissance activities, because space has its unique advantages over ground reconnaissance. Sexuality: Not subject to geographical restrictions, you can see any region on the earth to achieve global coverage; obtain intelligence quickly, timely and intuitively, and realize continuous dynamic reconnaissance. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/08G02B7/18G02B26/08
Inventor 张长瑞周新贵曹英斌周浩王思青
Owner NAT UNIV OF DEFENSE TECH
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