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High-temperature structure and function integrated Mg(Al)B2 and B4C co-enhanced aluminum-based neutron absorbing material and preparation method thereof

A technology for strengthening aluminum-based and absorbing materials, applied in shielding, nuclear engineering, reactors, etc., can solve the problems of insufficient high-temperature strength, poor plasticity, and high cost, and achieve the effects of increased high-temperature strength, good plasticity, and improved wettability

Active Publication Date: 2020-06-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the existing B in the prior art 4 Insufficient high temperature strength of C / Al material, or high temperature resistance B 4 C / Al has poor plasticity, difficult processing or high cost. The purpose of the present invention is to provide a high-temperature structure-function integrated Mg(Al)B 2 and B 4 C co-reinforced aluminum-based neutron absorbing material and its preparation method. This method optimizes the composition of the matrix alloy, and proposes "heating-pressurization to a specified density-slow temperature rise to control in-situ reaction-repressurization to achieve densification " process, by specifying the density after two times of pressurization and the heating rate during in-situ reaction, to control the content and uniform distribution of the liquid phase in the sintering process, so as to prepare high-temperature structure-functional integrated neutron absorbing materials

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] B in air at 550°C 4 C particles were pre-oxidized for 45 min. Weigh aluminum powder 355g, B 4 125g of C particles and 20g of Mg powder are mixed, and the phase diagram shows that the solidus line of the Al-Mg alloy of this composition is about 570°C. First raise the temperature to 550°C at 15°C / min, apply pressure to make the density reach 88%, then reduce the pressure to 15MPa, raise the temperature at 1°C / min, increase the pressure again after raising the temperature to 640°C, make the density reach 100%, and then stop heating. The sintered ingot was hot extruded into a strip at 450°C with an extrusion ratio of 16:1. The extruded strip was annealed at 450°C for 8 hours to obtain the final profile.

[0033] The final material composition is based on B 4 C. Mg(Al)B 2 As a reinforcing phase, a structure-function integrated neutron absorbing material based on pure Al, with about 7wt.% nano-sized Mg(Al)B 2 The particles are dispersed in the matrix. The material is ...

Embodiment 2

[0053] B in air at 550°C 4 C particles were pre-oxidized for 45 min. Weigh aluminum powder 345g, B 4 Mix 125g of C particles and 30g of Mg powder. The density is pressed to 90% by cold isostatic pressing, followed by vacuum hot pressing sintering. Firstly, the temperature is raised to 530°C at 15°C / min, then at 1.5°C / min, and then to 640°C, and pressure is applied to complete densification. The sintered ingot was rolled into a strip at 450°C with a deformation ratio of 10:1. The strip was annealed at 450°C for 8 hours to obtain the final profile.

[0054] The final material composition is based on B 4 C. Mg(Al)B 2 As a reinforcing phase, a structure-function integrated neutron absorbing material based on pure Al, with about 11.5wt.% nano-sized Mg(Al)B 2 The particles are distributed in the matrix. The material is strengthened by load transfer and the grain boundaries and dislocations are effectively pinned to obtain a material with good strong-plastic matching.

[005...

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PUM

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Abstract

The invention discloses a high-temperature structure and function integrated Mg(Al)B2 and B4C co-enhanced aluminum-based neutron absorbing material and a preparation method thereof, and belongs to thetechnical fields of neutron absorbing materials and aluminum-based composite materials. According to the method, the components of a matrix alloy are optimized, the wettability of the alloy is improved through B4C particle pre-oxidation, densification is achieved through a process of heating, pressurizing to the specified density, slow heating control in-situ reaction and re-pressurizing, and thedensity obtained after two times of pressurizing and the heating speed in the in-situ reaction are specified, so that the content and uniform distribution of a liquid phase in the sintering process are controlled, and the high-temperature structure and function integrated neutron absorbing material is prepared. The content of the liquid phase in the hot-pressing sintering process is controlled byregulating and controlling the corresponding hot-pressing temperature and heating speed, so that the interface reaction is continuously, controllably and thoroughly carried out until the Mg element is exhausted and the liquid phase disappears finally, thereby completing the instantaneous liquid-phase reaction sintering process. In the obtained material, nano Mg(Al)B2 is dispersed and distributedin a matrix, so that the high-temperature performance of the material is remarkably enhanced.

Description

technical field [0001] The invention relates to the technical field of neutron absorbing materials and aluminum-based composite materials, in particular to a high-temperature structure-function integrated Mg(Al)B 2 and B 4 C co-enhanced aluminum-based neutron absorbing material and its preparation method. Background technique [0002] During the operation of the nuclear reactor, nuclear fuel is continuously converted into spent fuel, that is, spent nuclear fuel. Spent fuel has high radioactivity, and the safe development of nuclear power requires reliable spent fuel storage technology. During the transportation and storage of spent fuel, neutron absorbing materials are required for shielding protection, while maintaining the reaction in a subcritical safe state. The current storage method is to use neutron absorbing materials to maintain the subcritical state of spent fuel in conjunction with structural materials, usually B 4 The C / Al neutron absorbing material is placed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C21/00C22C32/00G21F1/08
CPCC22C1/05C22C21/00C22C32/0052C22C32/0057G21F1/08
Inventor 马宗义昝宇宁肖伯律王全兆周杨韬王东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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