C/SiC porous composite ceramic with bionic structure and preparation method of C/SiC porous composite ceramic
A technology of composite ceramics and mixed powders, which is applied in the field of C/SiC porous composite ceramics with bionic structure and its preparation, which can solve the problems of lower specific surface area of porous SiC ceramics and achieve the effects of easy molding, high specific surface area and high porosity
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[0018] The invention provides a C / SiC porous composite ceramic with a bionic structure and a preparation method thereof, comprising the following steps:
[0019] Step 1: Select the carbon fiber skeleton, the carbon fiber skeleton can be chopped carbon fiber prefabricated parts, carbon fiber three-dimensional fabric, the density can be 0.2 ~ 0.6g / cm 3 ;
[0020] Step 2: Prepare carbon microspheres in the carbon fiber skeleton selected in step 1. Using microwave hydrothermal technology, put the biomass carbon source solution and carbon fiber skeleton into a microwave digestion tank, and then put the microwave digestion tank into a microwave hydrothermal synthesizer for reaction to obtain a carbon fiber skeleton bonded with carbon microspheres. The parameters of microwave hydrothermal reaction are: the concentration of biomass carbon source solution is controlled at 10-100g / L, the reaction temperature is 170-210°C, the reaction time is 1-3h, and the size of carbon microspheres i...
Embodiment 1
[0023] Step 1: Choose a density of 0.2g / cm 3 The chopped carbon fiber prefabricated part is used as a skeleton; glucose is used as a carbon source, and a glucose solution with a concentration of 50g / L is prepared;
[0024] Step 2: Using microwave hydrothermal technology, put the glucose solution and carbon fiber skeleton into a microwave digestion tank, and then put the microwave digestion tank into a microwave hydrothermal synthesizer for reaction to obtain a carbon fiber skeleton bonded with carbon microspheres. The reaction temperature was controlled at 170° C., the reaction time was controlled at 1 h, and the final carbon microsphere size was 200 nm.
[0025] Step 3: Put the porous carbon template processed in step 2 into a vacuum sintering furnace. Si and SiO 2 Mixed powder as silicon source, Si:SiO 2 The molar ratio is controlled at 2:1, the reaction temperature is controlled at 1300°C, the reaction partial pressure is controlled at 1KPa, and the reaction time is cont...
Embodiment 2
[0028] Step 1: Select a density of 0.6g / cm 3The chopped carbon fiber prefabricated part is used as a skeleton; with sucrose as a carbon source, a sucrose solution with a concentration of 70g / L is prepared;
[0029] Step 2: Using microwave hydrothermal technology, put the sucrose solution and carbon fiber skeleton into a microwave digestion tank, and then put the microwave digestion tank into a microwave hydrothermal synthesizer for reaction to obtain a carbon fiber skeleton bonded with carbon microspheres. The reaction temperature was controlled at 210° C., the reaction time was controlled at 1.5 h, and the final carbon microsphere size was 500 nm.
[0030] Step 3: Put the porous carbon template processed in step 4 into a vacuum sintering furnace. Si and SiO 2 Mixed powder as silicon source, Si:SiO 2 The molar ratio is controlled at 2:3, the reaction temperature is controlled at 1600°C, the reaction partial pressure is controlled at 100KPa, and the reaction time is controll...
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