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Neutron shield composite material taking foam metal as matrix and preparation method thereof

A foam metal and composite material technology, applied in the field of neutron shielding composite materials and their preparation, can solve the problems of poor mechanical properties and impact resistance, poor secondary gamma ray protection ability, poor heat dissipation, etc. The effect of comprehensive shielding performance, good comprehensive mechanical properties, and high neutron shielding performance

Inactive Publication Date: 2017-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

[0005] Traditional neutron protection materials are mainly heavy metals, light nuclear materials and concrete. Heavy metals are heavy, light nuclear materials have poor mechanical properties, and have poor protection against secondary gamma rays. Concrete has low protection efficiency and poor heat dissipation. Large mass and volume, such as CN201210529795.6, etc.
Therefore, the neutron shielding materials prepared by these methods cannot meet the comprehensive performance conditions of modern neutron shielding materials such as comprehensive shielding efficiency, process performance, and economic performance. Poor energy absorption rate and low energy absorption rate will bring certain difficulties and risks to the protection and emergency work of nuclear facilities. The development of a new type of neutron shielding material with high efficiency, economical mechanical properties and high energy absorption rate has become an urgent technology in this field. problem

Method used

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  • Neutron shield composite material taking foam metal as matrix and preparation method thereof

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Effect test

preparation example Construction

[0033] (1) Preparation of filler: Evenly mix one or several fillers with neutron moderating function and divide them into two parts, first take one part and heat it in a container until completely melted, keep stirring during the heating process, and continue stirring after melting For 20 minutes, keep the filler temperature at 15°C above the melting point to keep the melt in a low viscosity state.

[0034] (2) Cut the foam metal into a suitable size, immerse in one or more of hydrochloric acid, ethanol, petroleum ether, and silane coupling agent in turn, and use an ultrasonic generator to add ultrasonic treatment for 30 minutes to remove surface oxides and Oil stains, and form an oleophilic layer on the metal surface, improve the wettability of metal and organic matter, and put it into the pre-prepared mold.

[0035] (3), inject the filler obtained in step (1) into the metal foam prepared in step (2) from two corners of the container simultaneously, so that the filler is imme...

Embodiment 1

[0041] The neutron shielding material of the present invention taking metal foam as matrix:

[0042] The structural parameters of the metal foam substrate of the shielding material are as follows

[0043] Material Hole density Porosity length (cm) width (cm) Thickness (cm) Al 5PPI 97％ 40 40 2.09

[0044] The weight of each component of the shielding material functional neutron shielding filler is as follows: paraffin wax 3kg

[0045] The steps of the method for preparing the neutron shielding material with metal foam as the base are as follows:

[0046] (1) Melting of the filler: Put the paraffin in a water bath heating container and heat it to about 78°C. Stir continuously during the heating process to make it evenly heated to ensure that the paraffin is completely melted into a fluid and then continue to stir for 20 minutes to keep warm.

[0047] (2) Pretreatment of foamed metal: cut the foamed metal to 40cm*40cm*2.09cm, put it in 2% hydro...

Embodiment 2

[0054] The neutron shielding material based on metal foam according to the present invention:

[0055] The structural parameters of the metal foam substrate of the shielding material are as follows:

[0056] Material Hole density Porosity length (cm) width (cm) Thickness (cm) Cu 10PPI 99.6％ 40 40 1.35

[0057] The weight of each component of the functional neutron shielding filler of the shielding material is as follows: 2kg of low-density polyethylene, 350g of boron carbide, and 20g of methacryloxysilane.

[0058] (1) Melting of the filler: Take 1kg of polyethylene particles and put them into a heating container and heat them to about 135°C. Stir continuously during the heating process. After the polyethylene is completely melted into a fluid, continue to stir for 20 minutes and keep warm for later use.

[0059] (2) Pretreatment of foamed metal: cut the foamed metal to 40cm*40cm*1.35cm, first put it in 2% hydrochloric acid solution and soni...

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Abstract

The invention discloses a neutron shield composite material taking foam metal as a matrix and a preparation method thereof. The material comprises a foam metal matrix and a neutron shield functional filler, wherein the neutron shield functional filler comprises a neutron absorption functional filler and a neutron moderation functional filler; the neutron moderation functional filler is one or a mixture of several materials in resins such as polyethylene, polypropylene, polystyrene and the like or paraffin and water; the neutron absorption functional filler is one or a mixture of several materials in borax, boric acid, boron carbide, lithium hydride and the like; the foam metal is foam of metals such as perforated lead, aluminum, iron, copper, nickel and the like. According to the invention, the preparation method comprises the following steps of: sequentially performing high polymer heating and melting on raw materials, mixing organic fillers with inorganic fillers, pretreating the foam metal, filling the perforated foam metal with fillers, cooling, curing, and finally obtaining the product.

Description

[0001] Technical field: [0002] The invention relates to a neutron shielding composite material with metal foam as a matrix and a preparation method thereof, belonging to the field of nuclear radiation protection and the technical field of preparation of nuclear radiation shielding materials. [0003] Background technique: [0004] As the application of nuclear technology plays an increasingly important role in medical diagnosis and treatment, non-destructive testing, radiation processing, and detection, more and more people are engaged in work related to neutron sources, and neutrons will cause great harm to the human body. Neutrons have strong penetrating power, so neutron sources must be protected against neutron radiation. [0005] Traditional neutron protection materials are mainly heavy metals, light nuclear materials and concrete. Heavy metals are heavy, light nuclear materials have poor mechanical properties, and have poor protection against secondary gamma rays. Concr...

Claims

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Application Information

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IPC IPC(8): C08L91/06C08K9/00C08K9/02C08K9/06C08K7/24C08L23/06C08K3/38
CPCC08K9/00C08K3/38C08K7/24C08K9/02C08K9/06C08L23/06C08L91/06C08L2201/08C08L2207/066C08K2003/387
Inventor 汤晓斌张云柴浩倪敏轩陈托
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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