Preparation method of self-healing silicon-carbide-fiber-reinforced silicon-boron-nitrogen-carbon composite material
A technology of silicon-boron-nitrogen-carbon and composite materials, which is applied in the field of preparation of self-healing silicon carbide fiber-reinforced silicon-boron-nitrogen-carbon composite materials, can solve the problem of strength, toughness and reliability of thermal structural parts, ceramic matrix composite materials There are no problems such as self-healing and SiBNC fiber preparation difficulties, and achieve excellent self-healing, high-temperature mechanical properties, and low thermal expansion coefficient.
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Embodiment 1
[0023] Prepare a 70% polysilborazane anhydrous toluene solution, transfer the prepared solution to a nitrogen-protected high-temperature tube furnace, and increase the temperature in the furnace from room temperature to 150°C at a rate of 1°C / min and keep it constant Heat 1h for crosslinking treatment. The crosslinked SiBNC ceramic precursor was ground and a 60-mesh screen to obtain SiBNC ceramic powder with a particle size of 100μm. The type of SiC preform was 2.5-dimensional woven, and the fiber volume fraction was controlled to 40%; the ground SiBNC ceramic powder The preform with SiC fiber is placed in a mold, and it is hot pressed in a hot pressing device at 200° C. for 2 hours, and then demolded after cooling to obtain a silicon carbide fiber reinforced silicon boron nitride carbon composite material. The composite material was heated to 1400°C at a rate of 1°C / min under nitrogen flow for 2 hours to crack and ceramicize, and then the ceramicized silicon carbide fiber rein...
Embodiment 2
[0025] Prepare a polysilborazane anhydrous toluene solution with a concentration of 85%, transfer the prepared solution to a high temperature tube furnace protected by nitrogen, and increase the temperature in the furnace from room temperature to 190°C at a rate of 5°C / min and keep it constant Heat for 2h for crosslinking treatment. The crosslinked SiBNC ceramic precursor is ground and a 60-mesh screen is used to obtain SiBNC ceramic powder with a particle size of 200μm. The type of SiC fiber preform is 3-dimensional weaving, and the fiber volume fraction is controlled to 45%; the ground SiBNC ceramic powder The preform with SiC fiber is placed in a mold, and it is hot-pressed in a hot-pressing device at 215°C for 2.5 hours, and then demolded after cooling to obtain a silicon carbide fiber reinforced silicon-boron-nitrogen-carbon composite material. The composite material was heated to 1500°C at a rate of 5°C / min under nitrogen flow for 3.5 hours to crack and ceramicize, and th...
Embodiment 3
[0027] Prepare a 100% polysilborazane anhydrous toluene solution, transfer the prepared solution to a high-temperature tube furnace protected by nitrogen, and increase the temperature in the furnace from room temperature to 230°C at a rate of 10°C / min and maintain a constant temperature Heat for 3h for crosslinking treatment. The crosslinked SiBNC ceramic precursor was ground and a 60-mesh screen to obtain SiBNC ceramic powder with a particle size of 300μm. The type of SiC fiber preform was 3-dimensional weaving, and the fiber volume fraction was controlled to 52%; the ground SiBNC ceramic powder The preform with SiC fiber is placed in a mold, and it is hot pressed in a hot pressing device at 230° C. for 3 hours, and then demolded after cooling to obtain a silicon carbide fiber reinforced silicon boron nitride carbon composite material. The composite material was heated to 1600°C at a rate of 10°C / min under nitrogen flow for 5 hours to crack and ceramize, and then the ceramiciz...
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