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Rare-earth boride/boron carbide composite neutron absorption material and preparation method thereof

A technology of rare earth borides and absorbing materials, applied in the field of rare earth borides/boron carbide composite neutron absorbing materials and its preparation, can solve problems such as the influence of dysprosium titanate structure, reduce neutron absorption performance, etc., and achieve high neutron absorption , the effect of low swelling rate

Inactive Publication Date: 2012-10-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of dysprosium titanate is easily affected by the composition, which reduces the neutron absorption performance

Method used

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  • Rare-earth boride/boron carbide composite neutron absorption material and preparation method thereof
  • Rare-earth boride/boron carbide composite neutron absorption material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: The raw material components of the rare earth boride / boron carbide composite neutron absorbing material are as follows: 90 parts of boron carbide powder, Eu 2 o 3 5 parts of powder, 5 parts of sintering aid carbon powder, both are parts by mass. The boron carbide powder was purchased from Mudanjiang Diamond Boron Carbide Co., Ltd., d 50 =1.5μm. The Eu 2 o 3 and carbon powder are analytically pure.

[0046] The preparation method steps are as follows:

[0047] 1. According to the ratio, boron carbide powder, Eu 2 o 3 1. The carbon powder is ball milled and mixed for 30 minutes with anhydrous methanol as the medium. The inner lining of the ball mill tank is polyurethane lining, and the grinding balls are boron carbide grinding balls or 99 ceramic balls. The obtained slurry is dried under vacuum conditions to obtain mixed powder.

[0048] 2. After the above-mentioned mixed powder is pre-pressed and formed, it is formed by a cold isostatic pressing machin...

Embodiment 2

[0051] Embodiment 2: raw material component and preparation step 1 are as described in embodiment 1, difference is:

[0052] Step 2, granulate the above-mentioned mixed powder, pass through a 200-mesh sieve, and put it into a corresponding graphite mold.

[0053] Step 3. Put the above powder into a sintering furnace for discharge plasma sintering, the maximum temperature is 1800°C, the maximum pressure is 40MPa, keep warm for 10min, and cool naturally to obtain a rare earth boride / boron carbide composite neutron absorbing material.

[0054] The properties of the obtained product are as follows: compressive strength 1.90GPa, bending strength 420MPa, elastic modulus 285GPa, relative density 96%. The neutron fluence rate of the components in the fast neutron reactor is 1.41×10 11 n / cm 2 · After 180 effective days of irradiation at s, the element maintains the integrity of the original shape and geometric dimensions after irradiation, and the swelling rate is 0.6%.

Embodiment 3

[0055] Example 3: The raw material components of the rare earth boride / boron carbide composite neutron absorbing material are as follows: 80 parts of boron carbide powder, Dy 2 o 3 15 parts of powder, sintering aid TiO 2 5 parts of powder, all are parts by mass. The boron carbide powder is 10 Enrichment of 95% of B abundance 10 B boron carbide powder, d 50 =1.5μm.

[0056] The preparation method steps are as follows:

[0057] 1. According to the ratio, boron carbide powder, Dy 2 o 3 、TiO 2 The powder is ball milled with anhydrous methanol as the medium, the lining of the ball mill tank is polyurethane lining, and the grinding balls are boron carbide grinding balls or 99 ceramic balls. The ball milling is mixed for 30 minutes, and the obtained slurry is dried under vacuum to prepare the mixed powder.

[0058] 2. Gel injection molding

[0059] Add the above mixed powder into the mixed solution of monomer acrylamide (AM), crosslinking agent N,N'-methylenebisacrylamide a...

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Abstract

The invention relates to a rare-earth boride / boron carbide composite neutron absorption material and a preparation method thereof, wherein the rare-earth boride / boron carbide composite neutron absorption material is prepared from the following raw material components in parts by weight: 65-90 parts of boron carbide powder, 5-25 parts of rare-earth compound, and 5-10 parts of sintering auxiliary; the preparation method comprises the steps of mixing, ball-milling, forming and sintering the raw materials; and the highest sintering temperature is 1600-2250 DEG C. The rare-earth boride / boron carbide composite neutron absorption material disclosed by the invention has the characteristics of being high in neutron absorbability and low in turgescence and can be used as a ceramic material for a control rod, an adjusting rod, an accident rod, a safety rod and a shielding rod of a nuclear reactor.

Description

technical field [0001] The invention relates to a rare earth boride / boron carbide composite neutron absorbing material and a preparation method thereof, belonging to the technical field of nuclear industry protective materials. Background technique [0002] Neutron absorbing materials are important functional materials in nuclear reactor core 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, and the waste is easy to handle. Therefore, it is an important neutron-absorbing material and the only fast-moving material commonly used in the world. neutron absorbing material. There have been many reports on boron carbide ceramics as neutron absorbing materials. Wang Lingsen examined the neutron absorption performance of boron carbide shielding absorbing cores, and discussed the "swelling" characteristics of boron carbide ceramics (Wang Lingsen, boro...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622
Inventor 张玉军龚红宇魏汝斌江雅珍赵玉军焦倩张炎张琳
Owner SHANDONG UNIV
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