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
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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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