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Neutron and gamma ray integrated shielding filler and preparation method thereof

A comprehensive shielding and gamma ray technology, applied in the field of materials, can solve the problems affecting the comprehensive shielding performance of materials and the difference in the density of shielding components, and achieve the effect of improving the comprehensive shielding performance, improving the shielding performance and simplifying the process.

Inactive Publication Date: 2017-09-29
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] The purpose of the present invention is to provide a neutron and γ-ray integrated shielding material, which cannot fundamentally solve the problem of density difference between shielding components and affects the improvement of the comprehensive shielding performance of the material. Radiation comprehensive shielding filler and preparation method thereof

Method used

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  • Neutron and gamma ray integrated shielding filler and preparation method thereof
  • Neutron and gamma ray integrated shielding filler and preparation method thereof
  • Neutron and gamma ray integrated shielding filler and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using boron powder (≥99.9%, 300 mesh) and tungsten powder (99.9%, 3.2μm) as raw materials, mix W and B according to the atomic ratio of 2:1, use absolute ethanol as the medium, perform high-energy ball milling, and mix After being uniform, it is dried to obtain the first mixed powder.

[0033] The homogeneously mixed first mixed powder was sintered at 1350°C under the protection of argon for 4 hours, and then synthesized by reaction to obtain W 2 B sintered body.

[0034] Will prepare W 2 The B sintered body is crushed by high-energy ball milling, and after sieving, the W material with both neutron and γ-ray shielding properties is obtained. 2 B shield filler.

[0035] For the W prepared in this example 2 B shielding filler is measured by XRD, and its XRD analysis results are as follows figure 1 shown.

Embodiment 2

[0037] Using boron powder (≥99.9%, 300 mesh) and tungsten powder (99.9%, 2.0μm) as raw materials, W and B are mixed according to the atomic ratio of 2:1, and three-dimensional dry mixing is carried out. After mixing evenly, the first One mixed powder.

[0038] The uniformly mixed first mixed powder is subjected to cold isostatic pressing to obtain a mixed powder compact; wherein, the pressure is 180 MPa, and the holding time is 8 minutes.

[0039] The prepared mixed powder compact was sintered at a temperature of 1400 °C under the protection of argon for 2 hours, and then synthesized by reaction to obtain W 2 B sintered body.

[0040] Will prepare W 2 The sintered body of B is mechanically crushed and crushed by high-energy ball milling, and after sieving, W which has both neutron and γ-ray shielding properties is obtained. 2B shield filler.

[0041] For the W prepared in this example 2 B shielding filler is measured by XRD, and its XRD analysis results are as follows f...

Embodiment 3

[0043] Boron powder (≥99.9%, 300 mesh) and tungsten powder (99.9%, 300 mesh) are used as raw materials, and the atomic ratio of W and B is 2:1 for batching, and acetone is used as the medium for high-energy ball milling. After mixing evenly, Dry to obtain the first mixed powder.

[0044] The uniformly mixed first mixed powder is subjected to cold isostatic pressing to obtain a mixed powder compact; wherein, the pressure is 100 MPa, and the holding time is 10 minutes.

[0045] The prepared mixed powder compact was sintered at a temperature of 1300 °C for 4 hours in a high-temperature vacuum, and the W 2 B sintered body.

[0046] Will prepare W 2 The sintered body of B is mechanically crushed and crushed by high-energy ball milling, and after sieving, W which has both neutron and γ-ray shielding properties is obtained. 2 B shield filler.

[0047] For the W prepared in this example 2 B shielding filler is measured by XRD, and its XRD analysis results are as follows image 3...

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Abstract

The invention discloses a neutron and gamma ray integrated shielding filler and a preparation method thereof. The invention belongs to the field of shielding materials, and aims to solve the problem that the neutron and gamma ray integrated shielding material in the prior art cannot solve the problem of density variation between shielding components, which affects the improvement of the comprehensive shielding property of the material, in particular poor shielding property problem of the material. The filler comprises W and B at an atomic ratio of 2:1, and the phase composition is W2B. The invention provides a novel preparation method, which results in good density uniformity of the prepared shielding filler through controlling the reaction conditions, and can significantly improve the shielding property of the shielding filler, and thus is development of great significance.

Description

technical field [0001] The invention relates to the field of materials, especially the field of preparation of shielding materials, in particular to a neutron and gamma ray comprehensive shielding filler and a preparation method thereof. The shielding filler of the present invention has both excellent thermal neutron and gamma ray comprehensive shielding effects, and can effectively avoid the problem of density difference between shielding components, which has significant progress significance. Background technique [0002] In recent years, with the widespread application of nuclear energy, the chances of people being exposed to radioactive rays have increased unprecedentedly. In order to ensure the safety and health of the staff, it is necessary to effectively protect various rays produced by nuclear reactions. At present, the commonly used shielding materials for nuclear reactors are polymer-based shielding composite materials. Taking lead-boron polyethylene as an examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04C08K3/38G21F1/10
CPCC01B35/04C01P2002/72C01P2004/60C08K3/38G21F1/103
Inventor 何林李强雷洪波蔡永军刘向东龙亮甘杰杨华晏朝晖
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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