Aluminium-based composite material used for nuclear reactors to shield neutrons and gamma rays as well as preparation method thereof

An aluminum-based composite material and nuclear reactor technology, which is applied in the field of aluminum-based composite materials and preparations for nuclear reactors, can solve the problems of poor comprehensive performance of materials and achieve obvious absorption effects

Active Publication Date: 2016-07-27
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used shielding materials for nuclear reactors have some defects in certain properties, s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The powder is configured, the mass percentage of aluminum powder is 35%, and the mass percentages of tungsten powder and boron carbide powder are 55% and 10% respectively. A double-cone high-efficiency mixer is used for mixing, and argon protection is poured into the mixing process. The speed of the mixer is 60 rpm, the grinding medium is bearing steel balls, and the percentage of the grinding medium mass to the total mass of the raw material powder is 1: 1. The mixing time is 24 hours. The obtained mixture is filled into the cold isostatic pressing billet forming mold, and the cold isostatic pressing billet is pressed into a cold isostatic pressing billet with a pressure of 150 MPa, and the pressure is maintained for 1 hour. The density of the cold isostatic pressing billet is about the theoretical value 80% of the density. Use pure aluminum to weld the cold isostatic pressing billet sheath, and carry out degassing and packaging at 450°C. The blank after degassing an...

Embodiment 2

[0033] The powder is configured, the mass percentage of aluminum powder is 29%, and the mass percentages of tungsten powder and boron carbide powder are 70% and 1% respectively. A double-cone high-efficiency mixer is used for mixing, and argon protection is poured into the mixing process. The speed of the mixer is 60 rpm, the grinding medium is bearing steel balls, and the percentage of the grinding medium mass to the total mass of the raw material powder is 1: 1. The mixing time is 24 hours. The obtained mixture is filled into the isostatic pressing billet forming mold, and the isostatic pressing billet is pressed into an isostatic pressing billet by cold isostatic pressing. The pressure is 200 MPa, and the pressure is maintained for 1 hour. %. Weld the isostatic pressing ingot with pure aluminum, and carry out degassing and packaging at 450°C. The blank after degassing and sealing is subjected to hot isostatic pressing, the hot isostatic pressing temperature is 550° C., th...

Embodiment 3

[0036] The powder is configured, the mass percentage of aluminum powder is 70%, and the mass percentages of tungsten powder and boron carbide powder are 20% and 10% respectively. A double-cone high-efficiency mixer is used for mixing, and argon protection is poured into the mixing process. The speed of the mixer is 60 rpm, the grinding medium is bearing steel balls, and the percentage of the grinding medium mass to the total mass of the raw material powder is 1: 1. The mixing time is 24 hours. The obtained mixture is filled into the isostatic pressing billet forming mold, and the isostatic pressing billet is pressed into an isostatic pressing billet by a cold isostatic pressing method. The pressure is 180 MPa, and the pressure is maintained for 1 hour. %. Weld the isostatic pressing ingot with pure aluminum, and carry out degassing and packaging at 400°C. The blank after degassing and sealing is subjected to hot isostatic pressing, the isostatic pressing temperature is 570° ...

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PUM

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Abstract

The invention belongs to the field of composite shielding material technology, and especially relates to an aluminium-based composite material used for nuclear reactors to shield neutrons and gamma rays as well as a preparation method thereof. The composite material employs pure aluminium as a basis material, and shielding components are tungsten and boron carbide; the mass percent of tungsten is 20-70%; the mass percent of boron carbide is 1-10%; the balances are aluminium and unavoidable impurities. The aluminium-based composite material with certain mechanical strength as well as excellent nuclear reactor neutron and gamma ray irradiation resisting properties is developed by using an isostatic compaction method according to needs of some nuclear power reactors; the material whose thickness is 10cm can ensure that the transmittance of gamma rays whose power spectrum is 0.1-2MeV is reduced to 20% or less, and at the same time absorption effects of the composite material to thermal neutrons are substantially obvious.

Description

technical field [0001] The invention belongs to the technical field of composite shielding materials, and in particular relates to an aluminum-based composite material for a nuclear reactor shielding neutrons and gamma rays and a preparation method thereof. Background technique [0002] With the popularization and application of nuclear technology, the research on nuclear radiation shielding has also received extensive attention. Among the radiation produced by the reactor, the most harmful ones are neutrons and gamma rays with high penetrating power. The main task of nuclear shielding design is to shield neutrons and gamma rays. Although neutrons have no charge, they have strong penetrating power. They can travel farther in air and other substances, and the harm to human body is more serious than that of X-rays with the same dose. Commonly used shielding materials are composed of materials containing heavy elements (such as lead), light elements (such as hydrogen in water...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C27/04C22C32/00C22C1/05G21F1/08
Inventor 杨剑马书旺梁秋实刘坤杨志民甘斌何震罗英
Owner GRIMAT ENG INST CO LTD
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