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Neutron shielding composite material and preparation method thereof

A composite material, neutron technology, applied in the field of nuclear radiation shielding materials, can solve the problems of low neutron shielding performance, poor corrosion resistance, low mechanical strength, etc., to increase the ability to moderate neutrons, improve mechanical properties, excellent The effect of mechanical strength

Inactive Publication Date: 2018-11-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main neutron shielding materials mainly have the following problems: high bulk density, low mechanical strength, poor corrosion resistance, complicated preparation process and high cost
But its main defects are: (1) complex process, low yield and high price; (2) high volume density; (3) poor corrosion resistance
Patent CN201510128412.8 discloses a kind of methyl vinyl silica gel as the matrix, adding flame-retardant heat-insulating filler and neutron absorbing material, using a double-roll mill and a flat vulcanizer to prepare a flame-retardant and heat-insulating material. Neutron shielding materials have flame-retardant and heat-insulating properties to a certain extent, but their main defects are: (1) The process is relatively complicated and the cost is high
(2) Poor mechanical properties of materials
(3) Neutron shielding performance is not high
(4) Poor corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A neutron shielding composite material and a preparation method thereof, comprising:

[0018] (1) Immerse the pretreated polyurethane foam in the prepared slurry, extrude excess slurry through a pre-set roll, dry at room temperature for 12 hours, and dry in a drying oven at 120°C for 12 hours to obtain a green body Put the green body into a high-temperature furnace for sintering to finally prepare a ceramic foam matrix, put the prepared ceramic foam matrix into a silane coupling agent and perform ultrasonic treatment for 30 minutes, and then put it into a pre-prepared mold.

[0019] The foam ceramic parameters are as follows: matrix: Al 2 o 3 -ZrO; porosity: 85%; pore density: 10PPi; bulk density: 0.7g / cm 3 ;Length, width 5cm, thickness 2cm.

[0020] (2) Put 60 parts by mass of polyethylene into a mixer and heat until completely melted, keep the heating temperature at 10°C above its melting point to keep the melt at a low viscosity, add 25 parts by mass of boron carb...

Embodiment 2

[0025] A neutron shielding composite material and a preparation method thereof, comprising:

[0026] (1) Immerse the pretreated polyurethane foam in the prepared slurry, extrude excess slurry through a pre-set roll, dry at room temperature for 12 hours, and dry in a drying oven at 120°C for 12 hours to obtain a green body Put the green body into a high-temperature furnace for sintering to finally prepare a ceramic foam matrix, put the prepared ceramic foam matrix into a silane coupling agent and perform ultrasonic treatment for 30 minutes, and then put it into a pre-prepared mold.

[0027] The foam ceramic parameters are as follows: matrix: Al 2 o 3 -SiC; porosity: 90%; pore density: 10PPi; bulk density: 0.4g / cm 3 ;Length, width 5cm, thickness 2cm.

[0028] (2) Put 75 parts by mass of polyethylene into a mixer and heat until completely melted, keep the heating temperature at 15°C above its melting point to keep the viscosity of the melt low, add 40 parts by mass of gadolini...

Embodiment 3

[0033] A neutron shielding composite material and a preparation method thereof, comprising:

[0034] (1) Immerse the pretreated polyurethane foam in the prepared slurry, extrude excess slurry through a pre-set roll, dry at room temperature for 12 hours, and dry in a drying oven at 120°C for 12 hours to obtain a green body Put the green body into a high-temperature furnace for sintering to finally prepare a ceramic foam matrix, put the prepared ceramic foam matrix into a silane coupling agent and perform ultrasonic treatment for 30 minutes, and then put it into a pre-prepared mold.

[0035] The foam ceramic parameters are as follows: matrix: Al 2 o 3 -MgO; porosity: 85%; pore density: 15PPi; bulk density: 0.5g / cm 3 ;Length, width 5cm, thickness 2cm.

[0036](2) Put 70 parts by mass of polyethylene into a mixer and heat until completely melted, keep the heating temperature at 10°C above its melting point to keep the melt at a low viscosity, add 30 parts by mass of boron nitri...

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Abstract

The invention discloses a neutron shielding composite material and a preparation method thereof and belongs to the field of nuclear radiation shielding materials. The method is simple in technology and high in finished-product rate; the prepared foam ceramic-based neutron shielding composite material has excellent neutron shielding performance, small volume density and strong corrosion-resisting performance. The preparation method comprises the following steps: preparing net-shaped foam ceramic with certain mechanical properties through a polyurethane precursor method; then pre-treating a foamceramic material; after uniformly mixing 60 to 90 parts of a neutron-moderator material by mass, 10 to 40 parts of a neutron absorber material by mass and 0 to 10 parts of an additive by mass, whichare uniformly melted, putting a mixture into the pre-treated foam ceramic material; carrying out negative-pressure immersion at temperature higher than the melting temperature of the moderator material, so as to fill one part of the melted high-polymer moderator material into hollow hole ribs remained by polyurethane ignition loss; meanwhile, filling gaps of the foam ceramic; after cooling, removing a surplus high-polymer material which is overflowed from a matrix part, so as to prepare the novel neutron shielding foam ceramic composite material.

Description

technical field [0001] The invention belongs to the field of nuclear radiation shielding materials, and in particular relates to a neutron shielding composite material and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, the application of nuclear energy and nuclear technology has developed rapidly in recent years. While benefiting people's lives, it also brings traditional neutron shielding materials that are extremely destructive. Neutrons are electrically neutral and have strong penetrating properties, which can cause harm to the human body. At present, the main neutron shielding materials mainly have the following problems: high bulk density, low mechanical strength, poor corrosion resistance, complicated preparation process and high cost. Therefore, the preparation of high-performance neutron shielding materials has become an urgent problem to be solved today. [0003] At present, technicians have carrie...

Claims

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Application Information

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IPC IPC(8): C04B41/89C04B38/06C04B35/10C04B35/48C04B35/565C04B35/04
CPCC04B35/04C04B35/10C04B35/48C04B35/565C04B38/0615C04B41/009C04B41/52C04B41/89C04B2235/77C04B2235/96C04B41/4922C04B41/5058C04B41/4861C04B41/4523C04B41/5045C04B41/5064C04B41/46C04B38/0074C04B38/0067
Inventor 贾文宝汪瑜凡陈若愚黑大千
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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