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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  • Description
  • Claims
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Problems solved by technology

However, the structure of dysprosium titanate is easily affected b

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
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Example Embodiment

[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 toner are both analytical grade.

[0046] The preparation method steps are as follows:

[0047] 1. According to the ratio, combine boron carbide powder and Eu 2 O 3 , The carbon powder is ball milled and mixed with anhydrous methanol for 30 minutes, the ball mill tank is lined with polyurethane, the grinding balls are boron carbide grinding balls or 99 porcelain balls, and the resulting slurry is dried under vacuum conditions to obtain mixed powder.

[0048] 2. After the above-mentioned mixed powder is pre-pressed and molded, it is molded with a cold isostatic press at a molding pressure of 100 MPa.

[0049] ...

Example Embodiment

[0051] Example 2: Raw material components and preparation step 1 are as described in Example 1, the difference is:

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

[0053] Step 3. Put the above powder into a sintering furnace for spark plasma sintering, the highest temperature is 1800°C, the highest pressure is 40MPa, the temperature is kept for 10 minutes, and it is naturally cooled to obtain the rare earth boride / boron carbide composite neutron absorption material.

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

Example Embodiment

[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 are all parts by mass. The boron carbide powder is 10 95% enrichment 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, combine boron carbide powder, Dy 2 O 3 , TiO 2 The powder is ball milled with anhydrous methanol as the medium, the ball mill tank is lined with polyurethane lining, the grinding ball is boron carbide grinding ball or 99 porcelain ball, the ball mill is mixed for 30 minutes, and the resulting slurry is dried under vacuum conditions to prepare mixed powder.

[0058] 2. Using gel injection molding

[0059] The above mixed powder was added to the mixed solution of monomer acrylamide (AM), crosslinking agent N,N'-methylenebisacrylamide and deio...

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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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