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

A technology of honeycomb sandwich and composite materials, which is applied in the field of honeycomb sandwich structure silicon carbide-based composite mirrors and its preparation, which can solve the problems of difficulty in preparing high-rigidity honeycomb structure, lack of potential for weight reduction, and difficulty in lightweight processing. , to achieve excellent machinability, reduce surface defects, and obtain easy effects

Inactive Publication Date: 2006-01-11
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] Such as figure 1 , 2 3, the honeycomb sandwich structure silicon carbide-based composite material reflector of the present invention is bonded by the upper cover plate 1, the honeycomb sandwich layer 2 with the honeycomb structure, and the lower cover plate 3 and then is sintered into a whole by siliconizing. The preparation process is as follows:

[0033] Step 1. Preparation of C / C porous blank

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

[0035] Step 2. Preparation of C / C honeycomb structure preform

[0036] Use a CNC machine tool to process porous C / C blanks to the desired shape of the upper cover 1, lower cover 3, and honeycomb sandwich 2. Use an organic adhesive to ...

Embodiment 2

[0045] Step 1. Preparation of C / C porous blank

[0046] Fully mix and disperse the chopped carbon fiber and the ethanol solution of phenolic resin, press 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 immersion-cracking process 5 times, and obtain a density of 1.3g / cm 3 C / C plain billet.

[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 the honeycomb sandwich structure SiC mirror body

[0051] Put the preform of C / C honeycomb sandwich structure into a graphite crucible containing silicon powder and heat it to 1600℃ in a high-temperature vacuum furnace while maintaining the vacuum state in the furnace for 0.5 hours to prepare C / Si / SiC with honeycomb sandwich structure Mirror blank.

[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 a SiC-based composite material reflector based on a lightweight and high-resolution optical system (surface roughness less than 1 nanometer). In particular, it relates to a honeycomb sandwich structure SiC-based composite material mirror for a light-weight high-resolution optical system and a preparation process. Background technique [0002] With the development of science and technology and people’s continuous understanding of the universe, people’s development is shifting from the ground to space. Scientists from all over the world are constantly committed to space development activities, especially space reconnaissance activities, because space has unique advantages over ground reconnaissance. Nature: It is not limited by region, can see any area on the earth, realize global coverage; obtain information quickly, timely and intuitively, and can realize continuous dynamic reconnaissance. In order to improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(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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