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A kind of aluminum/aluminum fluoride composite ceramic neutron moderator and preparation method thereof

A technology of composite ceramics and aluminum fluoride, which is applied in the field of aluminum/aluminum fluoride composite ceramic neutron moderators and its preparation, and can solve the problems of uneven density of sintered bodies, explosion of dry mixed Al powder, and powder suction Vacuum system and other problems to achieve the effect of avoiding the risk of explosion

Active Publication Date: 2022-03-25
LAIWU ADVANCED CERAMIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Hot pressing and sintering Al / AlF with Al powder and aluminum fluoride powder as raw materials 3 During the preparation of composite ceramic moderators, there are often the following problems: 1) There is a risk of explosion in dry-mixed Al powder; 2) During vacuum or inert gas-protected hot-press sintering, part of the powder is easily drawn into the vacuum system during the vacuuming process ; 3) For large sintered blocks, uneven density of the sintered body is prone to occur; 4) There are many seams through the splicing of small blocks, which affects the neutron moderation effect

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  • A kind of aluminum/aluminum fluoride composite ceramic neutron moderator and preparation method thereof

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preparation example Construction

[0023] In a first aspect, the present invention provides a method for preparing an aluminum / aluminum fluoride composite ceramic neutron moderator, comprising the following steps:

[0024] Al powder, AlF 3 Powder and LiF powder are mixed in proportion, and filled with inert gas protection, to obtain mixed powder;

[0025] Put the mixed powder into a rubber mold, press isostatically to obtain a green body, process the green body to obtain a briquette suitable for hot pressing sintering, or mold the mixed powder on a press to form a briquette;

[0026] Sinter the compact by hot pressing to obtain Al / AlF 3 Sintered body;

[0027] Al / AlF 3 After the sintered body is ground and cut, it is assembled into a neutron moderator.

[0028] In some embodiments, the pressure of isostatic pressing is 80-160 MPa.

[0029] In some embodiments, Al powder, AlF 3 The mass ratio of powder and LiF powder is 30-35:64-69:1.

[0030] Further, Al powder, AlF 3 Powder and LiF powder median partic...

Embodiment 1

[0038] Al / AlF of the present invention 3 The neutron moderator has the characteristics of high density, few seams and high neutron moderator efficiency. The preparation method comprises the following steps:

[0039] (1) Ingredients and mixing: 28 parts of Al powder with a purity greater than 99.9%, 70 parts of AlF with a purity greater than 99.99% 3 LiF powder and 2 parts of LiF powder with a purity greater than 99.99% are put into a mixer, filled with argon for protection, and mixed for 20-60 minutes to obtain a mixture. The median particle size (d 50 ) are less than 10 μm.

[0040] (2) Compact: put the mixture into a rubber mold, press isostatically, the isostatic pressure is 120MPa, and the green body is processed to obtain a block suitable for hot pressing and sintering.

[0041] (3) Hot-pressing sintering: Put the briquette into a graphite-lined C / C mold, and heat-press and sinter in a hot-press furnace. During the hot-press sintering process, vacuumize, heat to 630°C...

Embodiment 2

[0045] Al / AlF of the present invention 3 The neutron moderator has the characteristics of high density, few seams and high neutron moderator efficiency. The preparation method comprises the following steps:

[0046] (1) Ingredients and mixing: 25 parts of Al powder with a purity greater than 99.9%, 74 parts of AlF with a purity greater than 99.99% 3 LiF powder and 1 part of LiF powder with a purity greater than 99.99% were put into a mixer, protected by argon, and mixed for 30 minutes to obtain a mixture. The median particle size (d 50 ) are less than 10 μm.

[0047] (2) Compact: put the mixture into a rubber mold, press isostatically, the isostatic pressure is 100MPa, and the green body is processed to obtain a block suitable for hot pressing and sintering.

[0048] (3) Hot-press sintering: put the green body into a C / C mold with graphite lining, and hot-press and sinter in a hot-press furnace. During the hot pressing sintering process, first vacuumize, then fill with argon...

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Abstract

The invention discloses an aluminum / aluminum fluoride composite ceramic neutron moderator and a preparation method thereof, comprising the following steps: mixing Al powder, AlF 3 LiF powder and LiF powder are mixed in proportion, and filled with inert gas protection to obtain mixed powder; the mixed powder is put into a rubber mold, isostatically pressed to obtain a green body, and the green body is processed to obtain a powder suitable for hot pressing sintering. Briquetting, or molding the mixed powder into a compact on a press; hot pressing and sintering the compact to obtain Al / AlF 3 Sintered body; Al / AlF 3 After the sintered body is ground and cut, it is assembled into a neutron moderator.

Description

technical field [0001] The invention belongs to the field of material preparation and processing, and in particular relates to an aluminum / aluminum fluoride composite ceramic neutron moderator and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Boron neutron capture therapy (BNCT) technology is a selective 10 B drug is injected into human blood, the drug is enriched in tumor cells, and the lesion is irradiated with an epithermal neutron beam, 10 B absorbs neutrons and emits high-energy, short-range alpha particles and 7 Li ions, these particles can kill tumor cells while avoiding damage to normal tissue cells. In the application of BNCT te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/00B22F3/14
CPCC22C1/05C22C29/005B22F3/14
Inventor 张振昊赵玉军孙海滨张玉军高鹏
Owner LAIWU ADVANCED CERAMIC TECH
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