Preparation method for SiBNC fiber/SiBNC composite material
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Embodiment 1
[0030] The small molecular monomer boron trichloride, dichloromethylsilane and hexamethyldisilazane were reacted at a molar ratio of 1.3:2:8.5 at -40°C for 75 hours to obtain the precursor polymer polyborosilazane. A polyborosilazane toluene solution with a mass fraction of 10% was prepared, and the SiBNC fiber was immersed in the above solution for 1 h and then taken out. The impregnated SiBNC fiber and precursor polymer were respectively placed in a tube furnace and heated to 150 °C for pre-composition. Linked for 1h to make it slightly cross-linked. Grind the pre-crosslinked precursor polymer into powder and fully mix it with the treated SiBNC fiber, put the mixture into the mold, and heat press at a pressure of 4 MPa and a temperature of 180 °C. Transfer the preform to the tube furnace under the protection of nitrogen atmosphere, heat it from room temperature to 60°C at a rate of 1°C / min, then feed trichlorosilane gas at a steady flow rate, and then raise the temperature a...
Embodiment 2
[0032] The small molecular monomer boron trichloride, dichloromethylsilane and hexamethyldisilazane were reacted at a molar ratio of 1.65:2.5:8.75 at 20°C for 80 hours to obtain the precursor polymer polyborosilazane. A polyborosilazane toluene solution with a mass fraction of 30% was prepared, the SiBNC fiber was immersed in the above solution for 2 h and then taken out, and the impregnated SiBNC fiber and precursor polymer were respectively placed in a tube furnace and heated to 175 °C for pre-composition. Linked for 2 hours to make it slightly cross-linked. Grind the pre-crosslinked precursor polymer into powder and fully mix it with the treated SiBNC fiber, put the mixture into the mold, and heat press at a pressure of 7 MPa and a temperature of 190 °C. Under the protection of nitrogen atmosphere, the preform was transferred to the tube furnace, heated from room temperature to 80°C at a rate of 1.5°C / min, and then fed with trichlorosilane gas at a steady flow rate, and the...
Embodiment 3
[0034] The small molecular monomer boron trichloride, dichloromethylsilane and hexamethyldisilazane were reacted in a molar ratio of 2:3:9 at 80°C for 85h to obtain the precursor polymer polyborosilazane. A polyborosilazane toluene solution with a mass fraction of 50% was prepared, the SiBNC fiber was immersed in the above solution for 3 hours and then taken out, and the impregnated SiBNC fiber and precursor polymer were respectively placed in a tube furnace and heated to 200 °C for pre-composition. Linked for 3 hours to make it slightly cross-linked. Grind the pre-crosslinked precursor polymer into powder and fully mix it with the treated SiBNC fiber, add the mixture into the mold, and heat press at a pressure of 10 MPa and a temperature of 200 °C. Transfer the preform to the tube furnace under the protection of nitrogen atmosphere, heat it from room temperature to 100°C at a rate of 2°C / min, then feed trichlorosilane gas at a steady flow rate, and then raise the temperature ...
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