Boron nitride nanotube reinforced ceramic-based composite material and preparation method thereof
A technology of boron nitride nanotubes and composite materials, which is applied in the field of boron nitride nanotube-reinforced ceramic matrix composites and its preparation, can solve problems such as difficulty in achieving uniform mixing, damage to boron nitride nanotubes, and limitations in practical applications. Achieve the effect of avoiding mechanical damage, uniform distribution and thorough mixing
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Embodiment 1
[0027] (1) Dissolve 50g of polycarbosilane into 150g of divinylbenzene to prepare a liquid solution of polycarbosilane.
[0028] (2) Add 0.5 g of boron nitride nanotubes to the liquid solution of polycarbosilane prepared in step (1), stir thoroughly, and treat with ultrasound to make the liquid solution of boron nitride nanotubes and precursor polycarbosilane Mix well;
[0029] (3) The mixture of the boron nitride nanotubes obtained in step (2) and the precursor polycarbosilane liquid solution is placed in an airtight container, the temperature is raised to 150° C., and the temperature is kept in nitrogen until the cross-linking is solidified.
[0030] (4) Put the cured mixture obtained in step (3) in a high-temperature furnace and heat it to 1200°C in a vacuum to crack polycarbosilane into silicon carbide ceramics, and obtain porous boron nitride nanotube-reinforced silicon carbide base composite material.
[0031] (5) Immerse the obtained porous boron nitride nanotube-rein...
Embodiment 2
[0034] (1) Select liquid borazine as the precursor of boron nitride.
[0035] (2) Add 20 g of boron nitride nanotubes into 125 g of liquid borazine, stir well, and use ultrasonic treatment to fully mix with borazine.
[0036] (3) Put the mixture of borazine and boron nitride nanotubes in an airtight container, raise the temperature to 100° C., and keep it in nitrogen at a pressure of 5 MPa for 60 hours until cross-linking and curing.
[0037] (4) Put the cured mixture in a high-temperature furnace and heat it to 1650°C under the protection of nitrogen to crack the borazine into boron nitride ceramics to obtain boron nitride nanotube-reinforced boron nitride-based composite materials.
[0038] (5) Immerse the obtained porous composite material into the precursor borazine. The amount of the precursor borazine is such that the liquid level exceeds the upper surface of the composite material by 5mm; put it in a closed container, raise the temperature to 100°C, and Incubate in 5MP...
Embodiment 3
[0041] (1) Select perhydropolysilazane as the precursor of silicon nitride.
[0042] (2) Add 1 g of boron nitride nanotubes into 500 g of liquid perhydropolysilazane, stir well, and treat with ultrasonic waves, so that it is fully mixed with perhydropolysilazane.
[0043] (3) Put the above-mentioned mixture of perhydropolysilazane and boron nitride nanotubes in a closed container, raise the temperature to 120° C., and keep it in argon with a pressure of 3 MPa for 10 hours until the cross-linking is solidified.
[0044] (4) Put the cured mixture in a high-temperature furnace, and heat it to 1100°C under the protection of ammonia gas, so that the perhydropolysilazane is cracked and converted into silicon nitride ceramics, and boron nitride nanotube-reinforced silicon nitride is obtained. base composite material.
[0045] (5) Immerse the obtained porous composite material into the precursor perhydropolysilazane. The amount of the precursor perhydropolysilazane is such that the l...
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Abstract
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