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A kind of al/alf for neutron moderation 3 Composite material and its preparation method

A composite material and neutron technology, which is applied in the field of Al/AlF3 composite material for neutron moderation and its preparation, can solve the problems of no strength, high bulk density and moderation of the mixture, so as to facilitate transportation, disassembly and assembly, and meet the requirements of The effect of high standard requirements and low impurity content

Active Publication Date: 2017-10-20
SOUTH CHINA INST OF COLLABORATIVE INNOVATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many units in China have carried out research on BNCT, and multi-type special micro-reactors are also under construction. Due to the inability to obtain dense Al / AlF 3 Sintered body, most reactors can only use filled Al, AlF 3 mixture
Since the mixture has no strength at all, it cannot be processed into a specific shape, and it is not easy to transport and install
In addition, it is difficult for the mixture to achieve a higher bulk density to achieve the same moderation effect, and the installation thickness of the mixture is much larger than that of the dense sintered body
In short, the properties of currently used moderator materials cannot meet the requirements, which limits the popularization and application of BNCT technology, and dense Al / AlF 3 The preparation of composite materials helps to promote the rapid development of BNCT and bring good news to tumor patients

Method used

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  • A kind of al/alf for neutron moderation <sub>3</sub> Composite material and its preparation method
  • A kind of al/alf for neutron moderation <sub>3</sub> Composite material and its preparation method
  • A kind of al/alf for neutron moderation <sub>3</sub> Composite material and its preparation method

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Embodiment 1

[0042] A kind of Al / AlF for neutron moderation 3 The preparation method of composite material, the steps are as follows:

[0043] (1) Weigh four groups of raw materials, each containing 30g of aluminum powder and 70g of aluminum fluoride powder, numbered 1#, 2#, 3#, 4#. Three kinds of sintering aids (LiF, NaF, MgF 2 ) each weighed 1g and added to 1#, 2#, 3# in turn, and 4# did not add sintering aid. Put each group of powders into 500ml polyurethane ball milling tanks respectively, add 300g zirconia ball mills and planetary ball mill at a speed of 200r / min for 2 hours, pass through a 60-mesh standard sieve to separate zirconia balls after ball milling, and vacuum pack the sieved powders spare.

[0044] (2) Weigh 50g of each of the 1#, 2#, 3#, and 4# four groups of powders sieved in step (1) and add them to a 100mm×100mm hot-pressing mold respectively. After the mold is loaded into the hot-pressing sintering furnace Seal and vacuumize, and start to heat up after the vacuum d...

Embodiment 2

[0054] A kind of Al / AlF for neutron moderation 3 The preparation method of composite material, the steps are as follows:

[0055] (1) Weigh three groups of raw materials according to 1# (50g aluminum, 50g aluminum fluoride), 2# (30g aluminum, 70g aluminum fluoride), 3# (10g aluminum, 90g aluminum fluoride), and add 1g to each group LiF. Put each group of powders into 500ml polyurethane ball milling tanks respectively, add 300g zirconia ball mills and planetary ball mill at a speed of 200r / min for 2 hours, pass through a 60-mesh standard sieve to separate zirconia balls after ball milling, and vacuum pack the sieved powders spare.

[0056] (2) Weigh 50g of each of the three groups of powders sieved in step (1) and add them to a 100mm×100mm hot-pressing mold respectively, put the mold into a hot-pressing sintering furnace, seal and vacuumize, and wait until the vacuum degree does not change Then start to raise the temperature. Before 400°C, the temperature is raised at a rate...

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Abstract

The invention belongs to the field of material for nuclear reactor, and specifically discloses an Al / AlF3 composite material for neutron moderation and a preparation method thereof. The preparation method comprises the following steps: AlF3 and Al powders are weighed and mixed at the rate of 1:1-9 in mass, a sintering aid is added, and ball-milling and screening are performed; the powder materials are put in a hot pressing die, hot pressed sintering is performed on the hot pressing die in a sintering furnace; the temperature of the hot pressing die is up to the highest sintering temperature and is kept for a certain time and cooled, and the Al / AlF3 composite material for neutron moderation is prepared. According to the invention, the materials with characteristics of high purity and small particles are adopted, a ball-milling technique is cooperated to fully mix the materials, the hot pressed sintering is performed at the temperature low a melting point of aluminum, the segregation of compositions is avoided, the prepared moderation material has uniform compositions and less impurity content, the material density is more than 2.6g / cm<3>, so that high standard requests of a nuclear material can be met.

Description

technical field [0001] The invention belongs to the field of materials for nuclear reactors, in particular to an Al / AlF for neutron moderation 3 Composite materials and methods for their preparation. Background technique [0002] Boron neutron capture therapy (BNCT) is considered to be an effective method for treating tumors. Its basic principle is to inject selective 10B-containing drugs into human blood, enrich the drugs in tumor cells, and irradiate them with epithermal neutron beams. At the lesion site, 10B absorbs neutrons to generate (n, α) reaction to release high-energy, short-range α particles and 7Li ions (the range of action is about 15 μm, which is equivalent to the diameter of cells), which can kill tumor cells while avoiding damage to normal cells. tissue cells. In the application of BNCT technology, the development of highly targeted 10B drugs and the acquisition of epithermal neutron beams are the key to determining whether the technology can be widely used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21K1/00G21K1/10
CPCG21K1/00G21K1/10
Inventor 郑华德艾树鹤李艳辉张明马艺娟
Owner SOUTH CHINA INST OF COLLABORATIVE INNOVATION