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Compact 10 B boron carbide-rich ceramics and preparation thereof

The technology of boron carbide ceramics and boron carbide powder is applied in the field of dense 10B-rich boron carbide ceramics and its preparation. Density, high strength effect

Inactive Publication Date: 2010-06-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, boron carbide neutron absorbing materials for nuclear reactors have the disadvantages of low neutron absorption capacity and low strength, which affect the development of nuclear reactors

Method used

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  • Compact 10 B boron carbide-rich ceramics and preparation thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Dense Rich 10 The raw material components of B boron carbide ceramics are as follows: 10 B: 90 parts of boron carbide powder, 3 parts of europium oxide, 2 parts of samarium oxide, 1 part of zirconia, and 4 parts of aluminum oxide, all of which are parts by mass. The rich B 10 The abundance of boron carbide powder is 90%, d 50 2.5 μm.

[0042] The preparation method steps are as follows:

[0043] 1. According to the above parts by weight, the 10 B boron carbide powder, europium oxide, samarium oxide, zirconia and alumina powder use absolute ethanol as the medium, the lining of the ball mill tank and the ball mill medium are both 95 porcelain, ball mill and mix for 30 minutes, dry under vacuum conditions, and prepare the mixture powder.

[0044] 2. Add the above-mentioned mixed powder into a rubber mold, and form it with a cold isostatic press, with a forming pressure of 300 MPa.

[0045] 3. Dry the molded green body above, put it into a sintering furnac...

Embodiment 2

[0047] Embodiment 2: as described in embodiment 1, the difference is rich in B 10 The abundance of boron carbide powder is 68%. product 10 B abundance is 54%.

Embodiment 3

[0048] Example 3: Dense Rich 10 The raw material components of B boron carbide ceramics are as follows: 10 B: 86 parts of boron carbide powder, 3 parts of europium oxide, 2 parts of samarium oxide, 3 parts of gadolinium oxide, and 4 parts of aluminum oxide, all of which are parts by mass. Said rich 10 The abundance of B boron carbide powder is 68%, d 50 2.5 μm.

[0049] The preparation method steps are as follows:

[0050] 1. According to the above parts by mass, the 10 B boron carbide powder, europium oxide, samarium oxide, gadolinium oxide and alumina powder use absolute ethanol as the medium, the lining of the ball mill tank and the ball milling medium are both 95 porcelain, the ball mill is mixed for 30 minutes, and dried under vacuum conditions to prepare the mixture powder.

[0051] 2. Gel injection molding

[0052] Add the above mixed powder into the mixed solution of monomer acrylamide (AM), crosslinking agent N, N'-methylenebisacrylamide and deionized water, di...

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Abstract

The invention relates to compact 10 B boron carbide-rich ceramics, which is prepared from the following raw materials in part by mass: 84 to 95 parts of 10 B boron carbide-rich powder, 1 to 6 parts of europium oxide, 0 to 4 parts of samarium oxide, 0 to 3 parts of gadolinium oxide, 1 to 3 parts of zirconium oxide and 1 to 3 parts aluminum oxide. The ceramics is prepared by the following steps of: ballmilling and molding the raw materials; and sintering the raw materials at the highest sintering temperature of between 2,000 and 2,250 DEG C. The compact 10 B boron carbide-rich ceramics has the characteristics of high neutron absorptivity, high strength and high compactness, and can be used as ceramic materials of control rods, regulating rods, emergency rods, safety rods, and shielding rods of nuclear reactors.

Description

technical field [0001] The present invention relates to a dense rich 10 B boron carbide ceramics and a preparation method thereof belong to the technical field of nuclear industry protection materials. Background technique [0002] In nuclear reactor core assemblies, neutron absorbing materials are important functional components next to fuel components. Boron carbide has a high neutron absorption cross-section and a wide absorption energy spectrum. After absorbing neutrons, there is no strong secondary radiation of γ-rays, so the waste is easy to handle. Therefore, it is an important neutron-absorbing material, and it is also the only one commonly used in the world. fast neutron absorbing material. As a neutron absorbing material, boron carbide ceramics should have the following properties: 1) sufficient strength and relative density; 2) high thermal conductivity; 3) high neutron absorbing capacity. [0003] The neutron absorption capacity of boron carbide mainly depends...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
Inventor 张玉军龚红宇谭砂砾张潇予王翠玲王永聪
Owner SHANDONG UNIV
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