Method for preparing self-healing silicon carbide ceramic-based composite material
A composite material and a technology for synthesizing silicon carbide, which is applied in the field of preparation of silicon carbide ceramic matrix composite materials, can solve the problems of difficulty in ensuring uniform dispersion of active powder fillers, weakening the self-healing and anti-oxidation ability of ceramic matrix composite materials, and achieves self-healing and anti-oxidation. The effect of strong healing and anti-oxidation ability, short preparation period and low preparation cost
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[0020] The present invention will be described in further detail below. A method for preparing a self-healing silicon carbide ceramic matrix composite material, characterized in that the preparation steps are as follows:
[0021] 1. Preparation of silicon carbide fiber prefabricated body: The silicon carbide fiber prefabricated body is prepared with continuous silicon carbide fiber as raw material, and its structural form is: 2D fiber layup, 2.5D fiber weaving, 3D fiber weaving or 3D fiber acupuncture felt;
[0022] 2. Preparation of precursor impregnation solution: use polycarbosilane and trimethylaminoborane polymer as solute, and xylene as solvent to prepare precursor impregnation solution. The solute accounts for 45% to 60% by weight of the precursor impregnation solution. Polycarbosilane accounts for 60% to 85% by weight of the solute;
[0023] 3. Prepare the silicon carbide fiber preform interface layer: place the silicon carbide fiber preform in a chemical vapor depos...
Embodiment 1
[0035] 1. Preparation of silicon carbide fiber prefabricated body: a 3D fiber-woven silicon carbide fiber prefabricated body is prepared using continuous silicon carbide fiber as a raw material.
[0036] 2. Prepare the precursor impregnation solution: use polycarbosilane and trimethylaminoborane polymer as the solute, and xylene as the solvent to prepare the precursor impregnation solution. The solute accounts for 60% by weight of the precursor impregnation solution. Polycarbosilane Accounting for 55% by weight of solute;
[0037] 3. Prepare the silicon carbide fiber preform interface layer: place the silicon carbide fiber preform in a chemical vapor deposition furnace, use propane as the gas source, prepare the pyrolytic carbon interface layer of the silicon carbide fiber preform, and the process conditions of chemical vapor deposition are : Propane flow 2L / min; N 2 Flow rate 2L / min; furnace pressure ≤ 2KPa; temperature 1000°C; deposition time 10h;
[0038] 4. Shaping: Put th...
Embodiment 2
[0049] 1. Preparation of silicon carbide fiber prefabricated body: a 3D fiber-woven silicon carbide fiber prefabricated body is prepared using continuous silicon carbide fiber as a raw material.
[0050] 2. Prepare the precursor impregnation solution: use polycarbosilane and trimethylaminoborane polymer as the solute, and xylene as the solvent to prepare the precursor impregnation solution. The solute accounts for 60% by weight of the precursor impregnation solution. Polycarbosilane Accounting for 66.7% by weight of solute;
[0051] 3. Prepare the silicon carbide fiber preform interface layer: place the silicon carbide fiber preform in a chemical vapor deposition furnace, use propane as the gas source, prepare the pyrolytic carbon interface layer of the silicon carbide fiber preform, and the process conditions of chemical vapor deposition are : Propane flow 2L / min; N 2 Flow rate 2L / min; furnace pressure 2KPa; temperature 1000°C; deposition time 5h;
[0052] 4. Shaping: Put t...
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