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Selectively passed materials and methods for their preparation

A selective and channel technology, applied in the field of materials, can solve problems such as difficult quality control, area limitation, affecting helium permeability and plutonium resistance performance, etc., to avoid unstable quality, avoid low process yield, and excellent selectivity. performance effect

Active Publication Date: 2017-05-10
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the helium-permeable window material is prepared by the above-mentioned quenching process, it must be welded to the fuel cartridge. During the welding heat treatment, the microstructure of the helium-permeable window material will undergo transformation from amorphous to crystal, which will affect the helium-permeable and plutonium-resistant materials. performance
Since the helium-permeable window made by this process is the weakest part of the fuel box's mechanical properties, its area is limited, and it is difficult to pass the subsequent mechanical impact assessment
Due to the above reasons, the yield rate of helium-permeable windows prepared by American technology is low and it is difficult to control the quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, the raw material of the selectively passing material is titanium and contains 10 B titanium boride. The purity of titanium is greater than 99.9%, in powder form, with a particle size of less than 10 microns, and the purity of titanium boride is greater than 99.9%, in powder form, with a particle size of less than 50 nanometers. Prepared by the following steps:

[0048] (a) in titanium boride 10 B mass calculation, according to 10 The mass ratio of B is 0.1% to carry out the batching of titanium powder and titanium boride powder, use ball mill to mix, ball mill time 2h, put the mixed material into isostatic pressing equipment, the operating pressure of isostatic pressing equipment is 80Mpa, in vacuum sintering Sintered in a furnace with a vacuum of 10 -3 Pa, the sintering temperature is 1000°C, the sintering time is 2h, and the matrix of the material is obtained;

[0049] (b) Encapsulate the obtained matrix into a high-purity aluminum can, send i...

Embodiment 2

[0053] In this embodiment, the raw material of the selectively passing material is titanium and contains 10 B titanium boride. The purity of titanium is greater than 99.9%, in powder form, with a particle size of less than 10 microns, and the purity of titanium boride is greater than 99.9%, in powder form, with a particle size of less than 50 nanometers. Prepared by the following steps:

[0054] (a) in titanium boride 10 B is calculated according to 10 The mass ratio of B is 1% to carry out the batching of titanium powder and titanium boride powder, use ball mill to mix, the ball mill time is 2h, put the mixed material into the isostatic pressing equipment, the operating pressure of the isostatic pressing equipment is 85Mpa, and sinter in vacuum Sintered in a furnace with a vacuum of 10 -3 Pa, the sintering temperature is 1200°C, the sintering time is 2h, and the matrix of the material is obtained;

[0055] (b) Encapsulate the obtained matrix into a high-purity aluminum c...

Embodiment 3

[0059] In this embodiment, the raw material of the selectively passing material is titanium and contains 10 The boron element of B. The purity of titanium is greater than 99.9%, in powder form, with a particle size of less than 10 microns, and the purity of boron is greater than 99.9%, in powder form, with a particle size of less than 50 nanometers. Prepared by the following steps:

[0060] (a) with boron 10 B is calculated according to 10 The mass ratio of B is 5% to carry out the batching of titanium powder and boron powder, use ball mill to mix, ball mill time 2h, put the mixed material into the isostatic pressing equipment, the operating pressure of the isostatic pressing equipment is 100Mpa, in the vacuum sintering furnace Sintering, the vacuum degree is greater than 10 -3 Pa, the sintering temperature is 1300°C, the sintering time is 2h, and the matrix of the material is obtained;

[0061] (b) Encapsulate the obtained matrix into a high-purity aluminum can, send it ...

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Abstract

The present invention discloses a selectively passing material and a preparation method thereof, belonging to the technical field of materials. The selectively passing material is provided with a channel used for passing of helium, the channel is formed by a release process of helium which is generated by neutron irradiation for the material. The preparation method of the selectively passing material comprises the steps of: mixing powdery metal with powdery <10>B elementary substance / compound; sintering the mixture to obtain a matrix; then performing neutron irradiation processing on the obtained matrix; and finally performing heating processing on the matrix which is subjected to the neutron irradiation processing to release the helium generated by the neutron irradiation to form the selectively passing material. According to the selectively passing material and the preparation method of the present invention, the problem of preparing a <238>Pu helium-passing plutonium-blocking material is solved, and the characteristic that <10>B reacts with neutron to generate helium is ingeniously utilized to form a specific channel for diffusion of helium atoms, excellent selectively passing performance is achieved, in addition, the condition of each step of the preparation process can be easily controlled, thereby avoiding the disadvantages of low yield and unstable quality of foreign technology, and the selectively passing material also can be used as a helium-passing window material for being popularized and applied to alpha decay isotopes besides the <238>Pu.

Description

technical field [0001] The invention relates to a selective passage material and a preparation method thereof, in particular to a helium-permeable plutonium selective passage material and a preparation method thereof, belonging to the field of material technology. Background technique [0002] 238 Pu isotope thermoelectric battery is the 238 A power source that converts Pu's α-decay heat energy into electrical energy. It has the characteristics of small size, high specific power, and high reliability. 238 The half-life of Pu is as long as 87.4 years, and its service life is far longer than that of ordinary chemical batteries and solar cells. Therefore, it has great application value in many fields such as deep space exploration, marine or polar signal collection, and weaponry. [0003] because 238 Pu is an extremely toxic radionuclide, in order to prevent 238 Pu leakage, the PuO must be ceramized 2 The material is packaged in a shock-resistant, high-temperature, and cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21H1/06
CPCG21H1/06
Inventor 夏修龙郝繁华李毅付中华熊亮萍谢波肖成健龚宇侯京伟张勤英陈平
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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