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Neutron absorbing material rapid semi-solid state temperature zone forming method

A technology of absorbing materials and forming methods, which is applied in the field of rapid semi-solid forming of aluminum-based boron carbide neutron absorbing materials, can solve the problems of deteriorating mechanical properties of composite materials, difficult control, and many processes, and achieve excellent fluidity and formability. The effect of high yield rate and simplified process flow

Inactive Publication Date: 2018-09-28
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

These preparation methods all have respective advantages and disadvantages, and Al and B 4 C is prone to interfacial reactions, which is difficult to control and generates a large amount of AlB 2 、Al 3 BC and Al 4 C 3 Such as brittle phase, a large number of interfacial reactions will deteriorate the mechanical properties of composite materials
In the preparation process of solid state method, there are many processes and high cost

Method used

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  • Neutron absorbing material rapid semi-solid state temperature zone forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Ball mill mixing: take out powder by weight percentage: B 4 C: 31%, 6061 aluminum alloy 69%. Use a ball mill (speed 260rpm / min) to mix evenly, put the evenly mixed powder into a soft film, and vacuum to 10 -1 Pa;

[0031] (2) Perform cold isostatic pressing on the soft film in step (1) at a pressure of 260 MPa, and keep the pressure for 15 minutes to obtain a compact of aluminum-based boron carbide neutron absorbing material;

[0032] (3) Put the compact into a metal sheath, seal it and degas it at high temperature, and vacuum it to 10 -4 Pa;

[0033] (4) Hot-press sinter the composite material after vacuuming. The sintering temperature is 600°C, which is between the semi-solid temperature range of the solid and liquid phases of the 6061 aluminum alloy matrix. The pressure is 300MPa, and the pressure is kept for 15min. Prepare the aluminum-based boron carbide neutron absorbing material formed in a semi-solid state, and remove the metal sheath;

[0034] (5) Hot-...

Embodiment 2

[0037] (1) Ball mill mixing: take out powder by weight percentage: B 4 C: 11%, 89% for 1100 aluminum alloy. Use a ball mill (speed 280rpm / min) to mix evenly, put the evenly mixed powder into a soft film, and vacuum to 10 -1 Pa;

[0038] (2) Perform cold isostatic pressing on the soft film in step (1) at a pressure of 240 MPa, and keep the pressure for 15 minutes to obtain a compact of aluminum-based boron carbide neutron absorbing material;

[0039] (3) Put the compact into a metal sheath, seal it and degas it at high temperature, and vacuum it to 2×10 -4 Pa;

[0040] (4) Hot-press sinter the composite material after vacuuming, the sintering temperature is 640°C, the temperature is between the solid and liquid two-phase semi-solid temperature range of the 1100 aluminum alloy matrix, the pressure is 280MPa, and the pressure is maintained for 15min. Prepare the semi-solid formed aluminum-based boron carbide neutron absorbing material, and remove the metal sheath;

[0041] (...

Embodiment 3

[0044] (1) Ball mill mixing: take out powder by weight percentage: B 4 C: 20%, 80% of 2024 aluminum alloy. Use a ball mill (speed 280rpm / min) to mix evenly, put the evenly mixed powder into a soft film, and vacuum to 3×10 -1 Pa;

[0045] (2) Perform cold isostatic pressing on the soft film in step (1) at a pressure of 220 MPa, and keep the pressure for 15 minutes to obtain a compact of aluminum-based boron carbide neutron absorbing material;

[0046] (3) Put the compact into a metal sheath, seal it and degas it at high temperature, and vacuum it to 3×10 -4 Pa;

[0047] (4) Hot isostatic pressing is performed on the composite material after vacuuming. The sintering temperature is 640°C, which is between the semi-solid temperature range of the solid and liquid phases of the 1100 aluminum alloy matrix. Prepare the aluminum-based boron carbide neutron absorbing material formed in a semi-solid state, and remove the metal sheath;

[0048] (5) Heat the aluminum-based boron carbi...

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Abstract

The invention relates to a neutron absorbing material rapid semi-solid state temperature zone forming method, and belongs to the technical field of semi-solid state forming. The method is suitable forsemi-solid state forming plate blanks of particle (nano and micro scale) reinforced metal base composites. The method comprises the steps that a ball milling technology is adopted to prepare boron carbide and aluminum alloy mixed powder, and through isostatic cool pressing, a green body is obtained; technologies of hot pressing sintering, hot isostatic pressing and the like are carried out on solid and liquid two-phase semi-solid state temperature zone of an aluminum alloy, a high-compactness composite with ceramic particles evenly dispersed and distributed in an aluminum alloy base body isobtained, hot forging pressing, hot extrusion or hot rolling treatment is carried out on the aluminum alloy base body deformation temperature zone, heat treatment is carried out, and a high-compactness aluminum-based boron carbide neutron absorbing material with the uniform structure is made. Non-metallic materials are easily added, the preparing time is short, the material compactness is high, micrograph morphology is good, and production cost is low.

Description

technical field [0001] The invention relates to a rapid semi-solid forming method for an aluminum-based boron carbide neutron absorbing material. The invention can be used to prepare high-density particle-reinforced metal-based composite materials. The prepared composite materials have high density during semi-solid molding, and the microscopic appearance of dispersed and evenly distributed particles can finally realize rapid molding of materials. Background technique [0002] Aluminum-based boron carbide neutron absorbing material is a composite material. This material contains B elements with good neutron absorbing performance. It can be used as a nuclear power plant reactor spent fuel storage material to absorb thermal neutrons and prevent critical accidents. Its advantages are corrosion resistance, Radiation resistance, high boron content, and long service life can improve the economy and safety of spent fuel storage and transportation. The bottleneck problem that limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C32/00C22C1/05C22C1/10C22F1/04
CPCC22C21/00C22C1/05C22C32/0057C22F1/04
Inventor 庞晓轩鲜亚疆罗昊张佳佳杨晓峰王伟李强雷洪波张鹏程
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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