A kind of preparation method of silicon carbide airgel
An aerogel and silicon carbide technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of poor mechanical properties and high temperature resistance of silicon carbide aerogels, and achieve simple preparation methods and raw materials. The effect of simple source, high mechanical properties and high temperature resistance
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Embodiment 1
[0033] 1) Polycarbosilane (2g, Si-H molar content is 34mmol), trivinylmethylsilane (0.43g, vinyl molar content is 10.3mmol) and trace karstedt catalyst are dissolved in toluene (30mL), in nitrogen React under protection at 80°C for 6 hours to obtain a jelly-like polycarbosilane gel;
[0034] 2) The obtained polycarbosilane gel is treated with supercritical CO 2 Dry to obtain polycarbosilane airgel;
[0035] 3) Place the obtained polycarbosilane airgel in a tube furnace, raise the temperature to 1600°C at a rate of 2°C / min under the protection of nitrogen and keep it warm for 5 hours, then transfer it to a muffle furnace after cooling, Under the atmosphere, the temperature was raised to 600°C at a rate of 10°C / min and kept for 3 hours.
[0036] The obtained silicon carbide airgel has a density of 0.233g / cm 3 , with an average pore diameter of 15nm and a specific surface area of 676m 2 / g, the compressive strength is 2.9MPa.
Embodiment 2
[0038] 1) Dissolve polycarbosilane (2 g, Si-H molar content of 34 mmol), divinyldimethylsilane (0.77 g, vinyl molar content of 13.8 mmol) and a small amount of karstedt catalyst in cyclohexane (46 mL) , and reacted at 80°C for 6 hours under the protection of nitrogen to obtain a jelly-like polycarbosilane gel;
[0039] 2) The obtained polycarbosilane gel is treated with supercritical CO 2 Dry to obtain polycarbosilane airgel;
[0040] 3) Place the obtained polycarbosilane airgel in a tube furnace, raise the temperature to 1600°C at a rate of 1°C / min under the protection of nitrogen and keep it warm for 5 hours, then transfer it to a muffle furnace after cooling, Under the atmosphere, the temperature was raised to 600°C at a rate of 10°C / min and kept for 3 hours.
[0041] The obtained silicon carbide airgel has a density of 0.175g / cm 3 , with an average pore diameter of 38nm and a specific surface area of 831m 2 / g, the compressive strength is 1.4MPa.
Embodiment 3
[0043] 1) Polycarbosilane (2g, Si-H molar content is 34mmol), trivinylmethylsilane (0.64g, vinyl molar content is 15.5mmol) and trace karstedt catalyst are dissolved in toluene (33mL), in nitrogen React under protection at 80°C for 6 hours to obtain a jelly-like polycarbosilane gel;
[0044] 2) The obtained polycarbosilane gel is treated with supercritical CO 2 Dry to obtain polycarbosilane airgel;
[0045] 3) Place the obtained polycarbosilane airgel in a tube furnace, raise the temperature to 1800°C at a rate of 2°C / min under the protection of nitrogen and keep it warm for 3 hours, then transfer it to a muffle furnace after cooling, Under the atmosphere, the temperature was raised to 600°C at a rate of 10°C / min and kept for 3 hours.
[0046] The obtained silicon carbide airgel has a density of 0.381g / cm 3 , with an average pore diameter of 8nm and a specific surface area of 527m 2 / g, the compressive strength is 5.1MPa.
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