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Aluminum-based composite material for shielding high-dose gamma-rays and thermal neutrons and preparation method thereof

An aluminum-based composite material, γ-ray technology, used in shielding, nuclear engineering, reactors, etc., can solve the problems that the shielding performance cannot better meet the higher requirements of high-performance nuclear reactors, and the comprehensive performance of materials is poor, and achieve excellent shielding performance. , rich and extended effect

Active Publication Date: 2019-03-01
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned materials have some defects in some properties, such as shielding performance, mechanical properties, heat resistance and processability, which lead to poor overall performance of the material.
Especially for high-dose gamma-ray radiation, the shielding performance of the above materials can not meet the higher requirements of high-performance nuclear reactors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Configure powder, weigh 7.5kg of tungsten powder respectively, B 4 C powder 0.385kg, high-purity aluminum powder 2.115kg, bearing steel ball 5kg, put into the mixer, flush into argon, set the mixing time to 8 hours, sieve and discharge after mixing. Fill the mixed powder into the cold isostatic pressing bag for cold isostatic pressing, the cold isostatic pressing pressure is 50MPa, and the pressure is maintained for 5 minutes. Put the cold-pressed ingot into a pure aluminum sheath for sealing and welding, and then degas and seal at 400°C. Hot isostatic pressing billet, hot isostatic pressing temperature is 500 ℃, pressure is 70MPa, hold pressure for 2 hours. After hot isostatic pressing, the pure aluminum sheath is removed by machining to obtain a composite material ingot.

[0037] The B element content in the composite material ingot was measured to be 3%. The test results show that the density of the obtained composite material ingot is 99.3%, and the aluminum matr...

Embodiment 2

[0039] Configure powder, weigh 8kg of WC powder, B 4 C powder 0.1kg, industrial pure aluminum powder 1.9kg, bearing steel ball 5kg, put into the mixer, flush with argon gas, set the mixing time to 24 hours, sieve and discharge after mixing. Fill the mixed powder into the cold isostatic pressing bag for cold isostatic pressing, the cold isostatic pressing pressure is 150MPa, and the pressure is maintained for 20min. Put the cold-pressed ingot into a pure aluminum sheath for sealing and welding, and then degas and seal at 490°C. Hot isostatic pressing billet, hot isostatic pressing temperature is 580 ℃, pressure is 130MPa, hold pressure for 4 hours. After hot isostatic pressing, the pure aluminum sheath is removed by machining to obtain a composite material ingot.

[0040] The test results show that the density of the obtained composite material ingot is 100%, and the aluminum matrix composite material with a thickness of 6cm makes 137 C s The transmittance of gamma rays dro...

Embodiment 3

[0042] Configure powder, weigh 9kg of tungsten powder respectively, B 4 0.064kg of C powder, 0.936kg of high-purity aluminum powder, and 5kg of bearing steel balls are put into the mixer, charged with argon gas, and the mixing time is set to 12 hours. After mixing, the mixture is sieved and discharged. Fill the mixed powder into the cold isostatic pressing bag for cold isostatic pressing, the cold isostatic pressing pressure is 100MPa, and the pressure is kept for 30min. Put the cold-pressed ingot into a pure aluminum sheath for sealing and welding, and then degas and seal at 500°C. Hot isostatic pressing billet, hot isostatic pressing temperature is 550 ℃, pressure is 120MPa, hold pressure for 6 hours. After hot isostatic pressing, the pure aluminum sheath is removed by machining to obtain a composite material ingot.

[0043] The B element content in the material was measured to be 0.5%. Other performance test results show that the density of the material is 99.8%, and the...

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Abstract

The invention discloses an aluminum-based composite material for shielding high-dose gamma-rays and thermal neutrons and a preparation method thereof, and belongs to the technical field of composite shielding materials. The aluminum-based composite material comprises, by mass percentage, 75%-90% of tungsten element, 0.5%-3% of boron element and the balance aluminum or aluminum alloy. Raw materialsof the tungsten element are selected from one or more of tungsten, tungsten carbide, tungsten oxide and tungsten boride. Raw materials of the boron element are selected from one or more of boron carbide and / or tungsten boride. The method specifically includes mixing the raw material powder under the protection of inert gas, and then conducting cold isostatic pressing and hot isostatic pressing molding processing to obtain the aluminum-based composite material. The aluminum-based composite material has the density of more than 99%, has good shielding performance, mechanical property, heat resistance and processing property, is applied to shielding of high-dose gamma-rays and thermal neutrons in a nuclear reactor, and is especially suitable for shielding the high-dose gamma-ray leakage areain the nuclear reactor.

Description

technical field [0001] The invention belongs to the technical field of composite shielding materials, in particular to an aluminum-based composite material and a preparation method for shielding high-dose gamma rays and thermal neutrons. 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 gamma rays and neutrons with high penetrating power. [0003] Currently widely used shielding materials for nuclear reactors include barite or iron ore concrete, boron steel, and lead-boron polyethylene. However, the above-mentioned materials have some defects in certain properties, such as shielding properties, mechanical properties, heat resistance and processability, which lead to poor comprehensive properties of the materials. Especially for high-dose gamma-ray radiation, the shielding propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C29/00C22C29/08C22C32/00C22C29/14C22C1/05C22C1/04C22C1/10G21F1/08
CPCC22C1/045C22C1/05C22C1/051C22C27/04C22C29/00C22C29/08C22C29/14C22C32/0005C22C32/0073G21F1/08G21F1/085
Inventor 马书旺王健吕政杨剑杨志民毛昌辉甘斌何震罗英
Owner GRIMAT ENG INST CO LTD
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