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A kind of neutron absorbing material with high rare earth content and preparation method thereof

A high rare earth content, absorbing material technology, applied in the field of neutron absorbing materials with high rare earth content and its preparation, can solve the problem of insufficient neutron absorbing performance

Active Publication Date: 2019-10-25
镇江纽科利核能新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to aim at the shortcoming that the existing aluminum-based boron carbide neutron absorbing material has insufficient neutron absorbing performance, and in order to further improve the neutron absorbing performance of the aluminum-based boron carbide neutron absorbing material, the rare earth elements gadolinium and samarium are introduced into the Among aluminum-based boron carbide neutron absorbing materials, a composite material with high rare earth content that can effectively improve the neutron absorption performance of aluminum-based boron carbide neutron absorbing materials is provided

Method used

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  • A kind of neutron absorbing material with high rare earth content and preparation method thereof
  • A kind of neutron absorbing material with high rare earth content and preparation method thereof
  • A kind of neutron absorbing material with high rare earth content and preparation method thereof

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Effect test

Embodiment 1

[0025] combine figure 1 , figure 2 , a neutron absorbing material with high rare earth content, wherein the neutron absorbing material with high rare earth content is carried out according to the following steps:

[0026] (1) High-energy ball mill: take by weight 30% boron carbide powder, 65% aluminum alloy powder, and 5% aluminum-gadolinium master alloy powder, put them into a tank, add grinding balls to the tank, and the weight ratio of the ball to material is 5: 1. Seal the tank and mix evenly in a planetary ball mill. The speed of the ball mill is 300rpm, and the ball milling time is 20h. At the same time, stearic acid is added as a process control agent. Stearic acid accounts for 1wt% of the raw materials;

[0027] (2) Cold pressure degassing and vacuuming: put the mixed powder into the mold, put the mold into the hot pressing furnace, first increase the pressure for cold pressing and degassing treatment, and then perform high vacuum treatment, vacuum pumping to 3×10 ...

Embodiment 2

[0032] combine image 3 , Figure 4 , a neutron absorbing material with high rare earth content, wherein the neutron absorbing material with high gadolinium content is carried out by the following steps:

[0033] (1) High-energy ball mill: take by weight 30% boron carbide powder, 60% aluminum alloy powder, and 10% aluminum-gadolinium master alloy powder as raw materials, put them into a tank, add grinding balls in the tank, and the weight ratio of the ball to material is 5:1, seal the tank and mix evenly in a planetary ball mill, the ball mill speed is 300rpm, the ball milling time is 8h, and stearic acid is added as a process control agent, and stearic acid accounts for 2wt% of the raw material;

[0034] (2) Cold pressure degassing and vacuuming: put the mixed powder into the mold, put the mold into the hot press furnace, first increase the pressure for cold pressing and degassing treatment, and then perform high vacuum treatment, vacuum pumping to 3×10 -2 Pa, the cold pre...

Embodiment 3

[0039] combine Figure 5 , Figure 6 , a neutron absorbing material with high rare earth content, wherein the neutron absorbing material with high gadolinium content is carried out by the following steps:

[0040] (1) High-energy ball mill: take by weight 30% boron carbide powder, 45% aluminum alloy powder, and 25% aluminum-gadolinium master alloy powder as raw materials, put them into a tank, add grinding balls in the tank, and the weight ratio of the ball to material is 10:1, after the tank is sealed, mix evenly in a planetary ball mill, the ball mill speed is 350rpm, and the ball milling time is 8h, while adding stearic acid as a process control agent, stearic acid accounts for 2wt% of the raw material;

[0041] (2) Cold pressure degassing and vacuuming: put the mixed powder into the mold, put the mold into the hot press furnace, first increase the pressure for cold pressing and degassing treatment, and then perform high vacuum treatment, vacuum pumping to 3×10 -2 Pa, th...

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Abstract

The invention discloses a neutron absorbing material with a high rare earth content and a preparation method thereof. The neutron absorbing material is composed of, by mass, 10-35% of boron carbide, 40-75% of an aluminum alloy and 5-40% of an aluminum-rare earth master alloy. The neutron absorbing performance of the aluminum based boron carbide neutron absorbing material is greatly improved. The aluminum based boron carbide neutron absorbing material is prepared through high energy ball milling and hot pressing sintering processes by means of a powder metallurgy method, so that the material has good distribution uniformity and a small grain size, and by adoption of the hot pressing process, high compactness of the aluminum based boron carbide neutron absorbing material is ensured, and part of rare earth is solidly dissolved into an aluminum substrate to form an aluminum-rare earth solid solution. The neutron absorbing performance is contributed through the boron carbide, a dispersed aluminum-rare earth intermetallic compound and the aluminum-rare earth solid solution. By adoption of the neutron absorbing material and the preparation method thereof, the neutron absorbing performance of the aluminum based boron carbide neutron absorbing material is improved while it is ensured that the aluminum based boron carbide neutron absorbing material has good mechanical performance.

Description

technical field [0001] The invention relates to a neutron absorbing material with high rare earth content and a preparation method thereof. Background technique [0002] Aluminum-based boron carbide neutron absorbing material is a composite material composed of boron carbide ceramics and metal aluminum matrix through a certain forming method. We often choose boron carbide as the neutron absorbing material. Boron carbide has many advantages such as high hardness, low density, high chemical stability and wear resistance, and good neutron absorption capacity, and boron carbide will not react to generate other radioactive isotopes while absorbing a large number of neutrons. Relatively cheap and easy to obtain. But its toughness is poor. Aluminum metal has the characteristics of light weight, good toughness and low cost. Therefore, the research on aluminum-based boron carbide neutron absorbing materials that combines the advantages of the two has attracted much attention. Alu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C32/00C22C1/05C22C1/10B22F3/02B22F3/14B22F3/24C22F1/04
CPCB22F3/02B22F3/14B22F3/24B22F2003/145B22F2003/248C22C1/05C22C21/00C22C32/0057C22F1/04
Inventor 张中武马云涛郭浩王志伟唐小存蒋波壮新
Owner 镇江纽科利核能新材料科技有限公司