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Paraffin/boron carbide neutron protection composite material and preparation method thereof

A composite material and boron carbide technology, which is applied in the field of paraffin/boron carbide neutron protection composite materials and preparation, can solve the problems of boron carbide sedimentation and agglomeration, and the structure is not dense, and achieves the effects of uniform distribution, dense structure and high preparation efficiency.

Active Publication Date: 2021-09-03
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a preparation method of paraffin / boron carbide neutron protection composite material, which solves the problems existing in the prior art when it is prepared by melting and casting. The organization is not compact, boron carbide precipitation and agglomeration and other problems

Method used

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  • Paraffin/boron carbide neutron protection composite material and preparation method thereof
  • Paraffin/boron carbide neutron protection composite material and preparation method thereof

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Embodiment 1

[0031] This embodiment discloses the preparation method of the paraffin / boron carbide neutron protection composite material of the present invention, which is carried out according to the following steps:

[0032] (1) mixing paraffin wax powder with a particle size of 0.1 to 0.5 mm and nuclear-grade boron carbide powder with a particle size of 10 to 50 μm for 3 hours, wherein the paraffin wax content is 50 wt %;

[0033] (2) Put the uniformly mixed composite material powder into a cylindrical soft film mold with a diameter of 50 mm and a height of 100 mm, and seal it after pumping air for 1 hour with an air pumping device. Then it is prepared into a compact with a certain density, strength and shape by cold isostatic pressing, the cold isostatic pressing pressure is 250 MPa, and the holding time is 5 minutes;

[0034] (3) Demolding: remove the soft film wrapped around the compact to obtain a finished paraffin / boron carbide neutron protection composite material.

[0035] The d...

Embodiment 2

[0037] This embodiment discloses the preparation method of the paraffin / boron carbide neutron protection composite material of the present invention, which is carried out according to the following steps:

[0038] (1) mixing paraffin wax powder with a particle size of 0.5 to 1 mm and nuclear-grade boron carbide powder with a particle size of 10 to 50 μm for 1 hour, wherein the paraffin wax content is 1 wt %;

[0039] (2) Put the uniformly mixed composite material powder into a cylindrical soft film mold with a diameter of 50 mm and a height of 100 mm, and seal it after pumping air for 1 hour with an air pumping device. Then it is prepared into a compact with a certain density, strength and shape by cold isostatic pressing, the cold isostatic pressing pressure is 100MPa, and the holding time is 30min;

[0040] (3) Demolding: remove the soft film wrapped around the compact to obtain a finished paraffin / boron carbide neutron protection composite material.

[0041] The density of...

Embodiment 3

[0043] This embodiment discloses the preparation method of the paraffin / boron carbide neutron protection composite material of the present invention, which is carried out according to the following steps:

[0044] (1) mixing paraffin wax powder with a particle size of 0.1 to 0.5 mm and nuclear-grade boron carbide powder with a particle size of 1 to 10 μm for 5 hours, wherein the paraffin wax content is 25 wt %;

[0045] (2) Put the uniformly mixed composite material powder into a cylindrical soft film mold with a diameter of 50 mm and a height of 100 mm, and seal it after pumping air for 1 hour with an air pumping device. Then it is prepared into a compact with a certain density, strength and shape by cold isostatic pressing, the cold isostatic pressing pressure is 180MPa, and the holding time is 18min;

[0046] (3) Demolding: remove the soft film wrapped around the compact to obtain a finished paraffin / boron carbide neutron protection composite material.

[0047] The density...

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Abstract

The invention discloses a paraffin / boron carbide neutron protection composite material and a preparation method thereof, belongs to the technical field of nuclear protection materials, and solves the problems of incompact structure, boron carbide sedimentation and agglomeration and the like during preparation by adopting a casting method in the prior art. According to the preparation method of the paraffin / boron carbide neutron protection composite material, the content of paraffin in the neutron protection composite material is 1-60wt%, and the balance is boron carbide; and the neutron protection composite material is prepared by adopting a cold isostatic pressing method. Paraffin and boron carbide are creatively adopted as raw materials, and the neutron protection composite material is prepared through the cold isostatic pressing method. The paraffin / boron carbide neutron protection composite material disclosed by the invention is uniform in boron carbide distribution, compact in structure and excellent in performance, can have double functions of slowing down and absorbing of fast neutrons, slow neutrons and thermal neutrons, and meets neutron protection requirements of special occasions of spent fuel post-treatment.

Description

technical field [0001] The invention belongs to the technical field of nuclear protection materials, and relates to a preparation method for protection materials used in nuclear radiation places such as nuclear reactor spent fuel assembly storage and radioactive material storage and transportation, and specifically relates to a paraffin / boron carbide neutron protection composite material and a preparation method. Background technique [0002] Nuclear energy is a non-petrochemical energy that is clean, low-carbon, highly reliable, and can be used on a large scale. It is an important part of my country's modern energy system. With the rapid development of nuclear power in my country, the safe storage, transportation and reprocessing of a large amount of spent fuel has become an unavoidable problem. Spent fuel contains a large amount of radioactive elements, which are highly radioactive, especially at the end stage of spent fuel reprocessing. Spent fuel mainly contains fissile ...

Claims

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Application Information

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IPC IPC(8): G21F1/10C04B26/26
CPCG21F1/103C04B26/26C04B2111/00258C04B2201/20C04B14/323C04B40/0259
Inventor 刘向东庞晓轩吴早明程亮罗昊鲜亚疆张鹏程李强晏朝晖刘炳刚龙亮段建国吴彪
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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