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Foamed neutron absorber material

A technology of absorbing material and neutron absorbing agent, applied in the field of building materials, can solve the problems of unsatisfactory neutron absorption effect and uneven distribution of neutron absorbing agent, etc.

Inactive Publication Date: 2011-04-27
李勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current neutron absorbing materials are all made by simply mixing neutron absorbers such as boron carbide, rare earth compounds, ferrite, and graphite with the matrix material, and the distribution of neutron absorbers in the mixture is not uniform. Neutron absorption is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The foamed neutron absorbing material consists of neutron absorber and matrix material. Among them, the neutron absorber is a mixture of boron carbide and paraffin, and the base material is a mixture of cement and polyethylene resin. The ratio is:

[0013] Boron carbide powder 12-35

[0014] Paraffin 2-5

[0015] Cement 0.5-1

[0016] Polyethylene resin 60-84

[0017] Mix boron carbide powder, paraffin, and cement according to the above proportions, put them into a vacuum mixer and stir for 20 minutes, then add them to the polyethylene resin in the above proportions and mix evenly, and melt and foam the pre-foamed materials according to the standard foaming procedure. The neutron absorbing foam material is prepared.

[0018] The boron carbide material has a large neutron capture cross-section and a wide capture energy spectrum, and it is mixed with paraffin to reduce the speed of fast neutron propagation. The rare earth compounds in the material have a unique atomi...

Embodiment 2

[0020] The foamed neutron absorbing material consists of neutron absorber and matrix material. Among them, the neutron absorber is a mixture of hexagonal boron carbide powder and ferrite powder, the base material is barium cement, and its proportion is:

[0021] Hexagonal boron carbide 5-20

[0022] Ferrite powder 5-20

[0023] Barium cement 65-80

[0024] Mix hexagonal boron carbide and ferrite powder according to the above ratio, stir in vacuum for 20 minutes to obtain a neutron absorber, then dope it into the barium cement in the above ratio, and mix evenly to obtain a pre-foamed material. Foaming is carried out by means of physical or chemical foaming to prepare a neutron absorbing foam material.

Embodiment 3

[0026] The foamed neutron absorbing material consists of neutron absorber and matrix material. Among them, the neutron absorber is a rare earth oxide, and the base material is EPDM rubber, and its ratio is:

[0027] Rare earth compounds (Gd, Sm, Dy, La, Ce) 20-40

[0028] EPDM 50-80

[0029] Polyvinyl alcohol: 2-5 parts by mass

[0030] The rare earth compound is purified by polyvinyl alcohol, and the electroless plating method and foaming process are used to coat a layer of rare earth coating on the surface of the EPDM foam to prepare the EPDM foam as the core, and the rare earth compound is The shell is a spherical neutron-absorbing foam material with a "shell-in-core" structure with neutron, fast, and slow radiation wave absorption and attenuation functions.

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PUM

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Abstract

The invention discloses a foamed neutron absorber material. The foaming neutron absorber material is prepared from the mixture of 10-60% of neutron absorber and 40-90% of matrix material through foaming, wherein the neutron absorber is one or more than one of boron carbide, ferrite, rare earth compound, lithium hydride and paraffin wax, and the matrix material is cement, or macromolecular polymer or their mixture. 'Foaming' process is innovatively applied, massive synthesized neutron absorber are dispersed on walls of the pores formed by foaming. The matrix cellular caves greatly expand capacity for capturing neutron rays, neutron rays in the interior of foamed body are diffused by virtue of electromagnetic vortex pore wall, and the scattered neutron waves are gradually attenuated and absorbed.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a foamed neutron absorbing material. Background technique [0002] Although neutrons have no electric charges, they have strong penetrating power. They can propagate a radiation distance of nearly 100 meters in the air and other substances, and the harm to the human body is more serious than the same dose of X and Y rays. In ion radiation protection, neutron radiation protection is the most important. At present, people have discovered many materials with neutron absorption function, commonly used are boron carbide, rare earth compounds, ferrite materials, graphite, and have been applied in many products. However, the current neutron absorbing materials are all made by simply mixing neutron absorbers such as boron carbide, rare earth compounds, ferrite, and graphite with the matrix material, and the distribution of neutron absorbers in the mixture is not uniform. Neutron absor...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L75/04C08L63/00C08L33/02C08L23/16C08L79/02C08K13/02C08K3/38C08K3/22C08K3/10C08K3/12C08K3/04C08K5/01C04B28/00
Inventor 李勇
Owner 李勇
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