Short carbon fiber-reinforced boron carbide composite material and preparation method thereof
A technology of short carbon fibers and composite materials, which is applied in shielding, nuclear engineering, reactors, etc., can solve the problems of enhanced boron carbide neutron-absorbing performance, complicated preparation process, and high equipment requirements, so as to improve neutron-absorbing efficiency and prepare The process is simple and the effect of product performance improvement
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Embodiment 1
[0047] Weigh 97.5vt.% boron carbide powder with a particle size of about 3.5μm and 2.5vt.% short carbon fiber, and mix the two uniformly and dry under a magnetic stirrer to obtain a mixed powder of B4C and short carbon fiber. The purity of the boron carbide powder is greater than 99%, containing trace Fe or graphite carbon; short carbon fiber is T300 type with a diameter of 7μm.
[0048] Pour the mixed powder into a Φ40mm graphite mold. The mold and the powder are separated by graphite paper, and sent to the spark plasma sintering equipment (FCT D25 / 3) for sintering. The vacuum is 1Pa, the pre-pressure is 8MPa, and the current parameter is on-off. Under the condition of 8ms-2ms, continue to pressurize to 45MPa, and raise the temperature to 2000°C at a heating rate of 100°C / min. After keeping the temperature for 20 minutes, it is cooled to 500°C at a cooling rate of 100°C / min and the furnace is cooled to room temperature;
[0049] The mold is taken out from the spark plasma sinteri...
Embodiment 2
[0052] Weigh 95vt.% of boron carbide powder with a particle size of about 3.5μm and 5vt.% of short carbon fiber, mix them evenly and dry under a magnetic stirrer to obtain a mixed powder of B4C and short carbon fiber. The purity of the boron carbide powder is greater than 99% , Containing trace Fe or graphite carbon; Short carbon fiber is T300 type with a diameter of 7μm.
[0053] Pour the mixed powder into a Φ40mm graphite mold. The mold and the powder are separated by graphite paper, and sent to the spark plasma sintering equipment (FCT D25 / 3) for sintering. The vacuum is 1Pa, the pre-pressure is 8MPa, and the current parameter is on-off. Under the condition of 8ms-2ms, continue to pressurize to 45MPa, and raise the temperature to 2000°C at a heating rate of 100°C / min. After keeping the temperature for 20 minutes, it is cooled to 500°C at a cooling rate of 100°C / min and the furnace is cooled to room temperature;
[0054] The mold is taken out from the spark plasma sintering furn...
Embodiment 3
[0057] Weigh 92.5vt.% of boron carbide powder with a particle size of about 3.5μm and 7.5vt.% of short carbon fiber, mix the two evenly and dry under a magnetic stirrer to obtain a mixed powder of B4C and short carbon fiber. The purity of the boron carbide powder is greater than 99%, containing trace Fe or graphite carbon; short carbon fiber is T300 type with a diameter of 7μm.
[0058] Pour the mixed powder into a Φ40mm graphite mold. The mold and the powder are separated by graphite paper, and sent to the spark plasma sintering equipment (FCT D25 / 3) for sintering. The vacuum is 1Pa, the pre-pressure is 8MPa, and the current parameter is on-off. Under the condition of 8ms-2ms, continue to pressurize to 45MPa, and raise the temperature to 2000°C at a heating rate of 100°C / min. After keeping the temperature for 20 minutes, it is cooled to 500°C at a cooling rate of 100°C / min and the furnace is cooled to room temperature;
[0059] The mold is taken out from the spark plasma sinterin...
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