Method for preparing silicon carbide ceramic nano-fiber membrane
A technology of silicon carbide ceramics and nanofiber membranes, which is applied in the preparation of spinning solutions and other directions to achieve the effects of simple process, large porosity and excellent high temperature resistance.
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Embodiment 1
[0018] Prepare a mixed solvent of xylene and dimethylformamide at a volume ratio of 7:3. 3.5 g of polyaluminocarbosilane was added into 5 mL of the mixed solvent and fully stirred for 4 hours to obtain a polyaluminocarbosilane solution with a concentration of 0.7 g / mL. After filling the solution into a glass syringe, electrospinning was carried out under the conditions of output voltage 15kV, injection flow rate 1.5mL / h, flat aluminum foil drawing distance 10cm, and spinning temperature 30°C, and polyaluminum carbon was obtained after spinning for 4 hours Silane fiber membrane. Dry the fiber membrane at 50°C for 2 hours, heat it up to 200°C in air for 3 hours to cross-link, and finally perform pyrolysis at 1200°C under the protection of nitrogen to obtain a silicon carbide ceramic nanofiber membrane.
Embodiment 2
[0020] Mixed solvents of xylene, tetrahydrofuran and dimethylformamide were prepared at a volume ratio of 3:1:1. Add 4.5 g of polyaluminocarbosilane into 5 mL of the mixed solvent and stir thoroughly for 5 hours to obtain a polyaluminocarbosilane solution with a concentration of 0.9 g / mL. After filling the solution into a glass syringe, electrospinning was carried out under the conditions of an output voltage of 20kV, an injection flow rate of 4.0mL / h, a flat aluminum foil receiving distance of 15cm, and a spinning temperature of 25°C. After spinning for 1 hour, we obtained Polyaluminocarbosilane fiber membrane. Dry the fiber membrane at 50°C for 2 hours, heat it up to 200°C in air for 3 hours to cross-link, and finally perform pyrolysis at 1400°C under the protection of nitrogen to obtain a silicon carbide ceramic nanofiber membrane.
Embodiment 3
[0022] A mixed solvent of xylene, tetrahydrofuran and dimethylformamide prepared in a volume ratio of 3:1:1, 6.0 g of polyaluminocarbosilane was added to 5 mL of the mixed solvent and fully stirred for 6 hours to obtain a polyaluminum carbosilane with a concentration of 1.2 g / mL. Aluminum carbosilane solution. After filling the solution into a glass syringe, electrospinning was carried out under the conditions of an output voltage of 25 kV, an injection flow rate of 2.0 mL / h, a receiving distance of the mesh cylinder of 15 cm, and a spinning temperature of 30 °C. A polyaluminocarbosilane fibril film was obtained by spinning for 3 hours. The fiber membrane was dried at 50° C. for 2 hours, and then heated to 200° C. in air for 3 hours to cross-link. Finally, pyrolysis was carried out at 1800° C. under the protection of nitrogen to obtain a silicon carbide ceramic nanofiber membrane.
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