A kind of preparation method of silicon carbide ceramic foam
A technology of silicon carbide ceramics and foam, which is applied in the field of in-situ preparation of silicon carbide ceramic foam by template method, can solve the problems of uncontrollable porosity, uneven distribution of sample component density, low mechanical properties, etc., and achieve controllable shape , easy to control, good overall effect
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Embodiment 1
[0035] Put the mixture of mesophase pitch powder and polyacrylonitrile-based nano-carbon fiber ground into 100 meshes into the FDK-autoclave. Raise the temperature to 330°C at a heating rate of 2°C / min, and keep it warm for 2 hours; then heat it up to 430°C at a heating rate of 2°C / min, keep it warm for 2 hours, and cool it down to room temperature naturally to obtain asphalt foam, and start the cycle cooling in the whole process water. At this point, the pressure inside the autoclave is the final foaming pressure; then the asphalt foam is heated to 850° C. in a carbonization furnace under a nitrogen protection environment and kept for 1 hour to obtain a carbon foam template; according to the carbon foam template and The amount of silicon powder is 1:1, weigh the silicon powder and sprinkle it on the outer surface of the top of the prepared carbon foam template, raise the temperature in the graphitization furnace at 4°C / min to 1900°C, and keep it for 2 hours to obtain silicon ...
Embodiment 2
[0037] Put the mixture of mesophase pitch powder and polyacrylonitrile-based nano-carbon fiber ground into 100 meshes into the autoclave, first fill the autoclave with nitrogen or inert gas to replace the air in the autoclave, open the release valve, and discharge the autoclave Air; then close the vent valve, fill the autoclave with nitrogen or inert gas until the pressure in the autoclave is not lower than 4MPa, and let it stand for 30 minutes until the autoclave does not leak, and the leak test is qualified;
[0038] Then adjust the FDK-autoclave controller, first raise the temperature to 330°C at a heating rate of 2°C / min, and keep it for 2 hours; then heat it to 430°C at a heating rate of 2°C / min, keep it for 2 hours, and cool to room temperature naturally , to get asphalt foam, and the whole process starts to circulate cooling water. Now, the pressure in the autoclave is the final foaming pressure;
[0039] Then, the asphalt foam is heated to 850° C. in a carbonization f...
Embodiment 3
[0042]The mesophase pitch powder ground into 100 meshes and polyacrylonitrile-based nano-carbon fibers are mixed according to the weight ratio of 20:1 and then loaded into the FDK-autoclave. First, nitrogen or inert gas is filled into the autoclave to replace the air in the autoclave. Open the air release valve to discharge the air in the kettle; then close the air release valve, fill the autoclave with nitrogen or inert gas until the pressure in the autoclave is not lower than 4MPa, and leave it for 30 minutes until there is no air leakage in the autoclave. Gas leak test is qualified;
[0043] Then adjust the FDK-autoclave controller, first raise the temperature to 330°C at a heating rate of 2°C / min, and keep it for 2 hours; then heat it to 430°C at a heating rate of 2°C / min, keep it for 2 hours, and cool to room temperature naturally , to get asphalt foam, and the whole process starts to circulate cooling water. Now, the pressure in the autoclave is the final foaming pressu...
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