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Irradiation-resistant high-temperature-resistant fast neutron shielding material and preparation method thereof

A shielding material and high-temperature-resistant technology, which is applied in the field of radiation-resistant and high-temperature fast-neutron shielding materials and its preparation, can solve the problems that organic shielding materials cannot meet the requirements of radiation aging, the mechanical properties of materials are reduced, and molecular chains are easy to break. Achieve the effect of improving shielding efficiency, low production cost and reducing porosity

Active Publication Date: 2020-11-17
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use temperature of organic shielding materials is relatively low, such as the use temperature of polyethylene and rubber-based shielding materials does not exceed 100°C, and the use temperature of epoxy-based shielding materials does not exceed 160°C
[0003] In addition, the molecular chains of organic shielding materials are easily broken and aged during the irradiation process. When the accumulated fast neutron fluence of organic shielding materials reaches 10 14 n / cm 2 When the fast neutron fluence reaches 10 15 n / cm 2 When the irradiation time is prolonged, the mechanical properties of the material will be significantly reduced, and the shielding material will continue to pulverize and become invalid as the irradiation time prolongs; while on the outside of the reactor pressure vessel, the neutron accumulation flux will reach 10 19 n / cm 2 Above, organic shielding materials cannot meet the requirements of radiation aging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a high temperature and radiation resistant fast neutron shielding material, which is obtained by the following preparation method:

[0039] Weighing: Calculated in parts by weight, 10 parts of CA80 aluminate cement, 89 parts of aluminum hydroxide powder, and 1 part of boron carbide powder with an average particle size of 3 μm.

[0040] Mixing: Dry mix all the weighed raw materials in a mortar mixer for 2 minutes, add 10 parts of water, and wet mix for 2 minutes.

[0041] Compression molding: Pour the mixed material into a steel mold with a molding pressure of 10MPa; after demolding, it is treated with cold isostatic pressing at a molding pressure of 300MPa to obtain a shielding block.

[0042] Curing: Put the shielding block into the curing box for 3 days to cure, then put the shielding block into the oven, bake at 110°C for 24 hours, and remove the free water in the shielding block.

[0043] The final prepared shielding material has a density ...

Embodiment 2

[0045] This embodiment provides a high temperature and radiation resistant fast neutron shielding material, which is obtained by the following preparation method:

[0046] Weighing: Calculated in parts by weight, 5 parts of CA70 aluminate cement, 94 parts of aluminum hydroxide powder, and 1 part of boron carbide powder with an average particle size of 3 μm.

[0047] Mixing: Dry mix all the weighed raw materials in a mortar mixer for 2 minutes, add 3 parts of water, and wet mix for 2 minutes.

[0048] Compression molding: pour the mixed material into a steel mold with a molding pressure of 10MPa; after demolding, it is treated with cold isostatic pressing at a molding pressure of 250MPa to finally obtain a shielding block.

[0049] Curing: put the shielding block into the curing box for 3 days of curing, and then put the shielding block into the oven at a baking temperature of 110°C for 24 hours to remove free water in the shielding block.

[0050] The final prepared shielding...

Embodiment 3

[0052] This embodiment provides a high temperature and radiation resistant fast neutron shielding material, which is obtained by the following preparation method:

[0053] Weighing: Calculated in parts by weight, 15 parts of CA80 aluminate cement, 80 parts of aluminum hydroxide powder, and 5 parts of boron carbide powder with an average particle size of 3 μm.

[0054] Mixing: Dry mix all the weighed raw materials in a mortar mixer for 2 minutes, add 15 parts of water, and wet mix for 2 minutes.

[0055] Compression molding: pour the mixed material into a steel mold, and the molding pressure is 100MPa to obtain a shielding block.

[0056] Curing: Put the shielding block into the curing box for 7 days of curing, then put the shielding block into the oven, bake at 110°C for 24 hours, and remove the free water in the shielding block.

[0057] The final prepared shielding material has a density of 1.8g / cm 3 , the hydrogen density is 0.07g / cm 3 .

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Abstract

The invention discloses an irradiation-resistant high-temperature-resistant fast neutron shielding material, which comprises the following raw materials in percentage by mass: 75-95% of a hydrogen-containing inorganic salt, 0.1-5% of boron carbide and the balance of an inorganic nonmetal gel material, wherein the density of the radiation-resistant high-temperature-resistant fast neutron shieldingmaterial is 1.8-2.4 g / cm<3>, and the hydrogen density is 0.07-0.09 g / cm<3>. The invention further provides a preparation method of the shielding material. The irradiation-resistant high-temperature-resistant fast neutron shielding material is obtained through combination of compression molding and maintenance processes. The shielding material provided by the invention can replace an organic shielding material and is applied to high-temperature and high-neutron fluence radiation fields, such as neutron plugs, nuclear reactor main pipeline shielding, spent fuel transportation and storage container shielding and the like.

Description

technical field [0001] The invention relates to the technical field of radiation protection and nuclear safety, in particular to a radiation-resistant, high-temperature, fast-neutron shielding material and a preparation method thereof. Background technique [0002] At present, neutron shielding mainly uses materials with high hydrogen and high boron content as shielding materials. Fast neutrons have strong penetration ability and difficult shielding. Generally, materials with high hydrogen content are used for moderation, and materials with high neutron absorption cross section are used. to absorb. Organic materials with high hydrogen content are the first choice for fast neutron shielding materials. Commonly used organic shielding materials include polyethylene-based shielding materials, rubber-based shielding materials, epoxy-based shielding materials, etc. However, the use temperature of organic shielding materials is relatively low. For example, the use temperature of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06G21F1/04
CPCC04B28/06G21F1/042C04B2201/20C04B2111/00862C04B22/06C04B14/323Y02E30/30
Inventor 李圆圆潘小强吕焕文肖锋吴莹杨静刘羽
Owner NUCLEAR POWER INSTITUTE OF CHINA
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