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

Pending Publication Date: 2020-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the preparation process is more complicated, and the equipment requirements are higher, and the continuous toughening metal can only use metals with lower melting points, so it cannot be used under high temperature conditions
[0007] In addition, the above two toughening methods do not enhance the neutron-absorbing performance of boron carbide, but will reduce its performance

Method used

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  • Short carbon fiber-reinforced boron carbide composite material and preparation method thereof
  • Short carbon fiber-reinforced boron carbide composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a short carbon fiber-reinforced boron carbide composite material and a preparation method thereof. The composite material is prepared from the following components in percentage by volume: 80-99 vt.% of boron carbide and 1-20 vt.% of short carbon fibers. The preparation method comprises the following steps: weighing boron carbide powder and short carbon fibers according toa designed component ratio of the short boron carbide composite material, adding the boron carbide powder and the short carbon fibers into a deionized water solution containing polyethylene glycol, conducting uniform mixing, and carrying out drying treatment to obtain mixed powder; and then filling a graphite mold with the mixed powder, and carrying out spark plasma sintering to obtain the shortcarbon fiber-reinforced boron carbide composite material. The preparation method is simple in process; a prepared sample is high in compactness; toughness is improved to a certain extent on the basisof keeping certain strength; and in addition, the neutron absorption performance of the composite material can be better improved, and the composite material can be better used in a nuclear reactor shielding layer.

Description

Technical field [0001] The invention relates to a boron carbide composite material and a preparation method thereof, in particular to a short carbon fiber reinforced boron carbide composite material and a preparation method thereof, and belongs to the technical field of carbon fiber reinforced ceramic composite materials. Background technique [0002] Boron carbide (B 4 C) Light density (2.5g / cm3), high melting point (> 2400℃), Vickers hardness is large (> 27GPa), stable chemical performance, low expansion coefficient (5.7×10-6 / ℃), high neutron absorption cross section, wide absorption energy spectrum, no secondary radiation pollution, and good corrosion resistance and thermal stability. Therefore, it is used in nuclear reactors. It has been widely used. Fast neutron reactors generally use different 10 B-enriched hot-pressed sintered boron carbide pellets are used as neutron absorber materials, this is because 10 The neutron absorption cross-section of B isotope is high, th...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/563C04B35/645G21F1/02
CPCC04B35/563C04B35/645C04B2235/5248C04B2235/5264C04B2235/5436C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/6581C04B2235/666C04B2235/77C04B2235/96G21F1/02
Inventor 曾凡浩古一陈欢
Owner CENT SOUTH UNIV
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