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Gadolinium oxide ceramics and method for manufacturing same

A technology of gadolinium oxide and ceramics, which is applied in the field of nuclear industry protective materials, can solve problems affecting the scope of use, and achieve the effects of easy industrial production, easy operation, and high neutron absorption capacity

Inactive Publication Date: 2015-09-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in previous studies, it was found that even if pure gadolinium oxide ceramics reach a high density, they will still be hydrolyzed after being soaked in hot water for a long time, which will affect its scope of use.

Method used

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  • Gadolinium oxide ceramics and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The specific raw material components of gadolinium oxide ceramics are as follows: 98 parts of gadolinium oxide and 2 parts of yttrium aluminum garnet.

[0055] The preparation method steps are as follows:

[0056] (1) According to the above parts by mass, use absolute ethanol as the medium and zirconia balls as the grinding medium to mix gadolinium oxide and yttrium aluminum pomegranate in a polyurethane ball mill tank for 4 hours, and the slurry mixed by ball milling under vacuum conditions Dried to obtain a mixed powder;

[0057] (2) The mixed powder obtained in step (1) is added with a binder (5%wt PVA aqueous solution) of 5‰ of the total mass of the mixed powder, added to a cylindrical abrasive tool, and pre-pressed with a hydraulic press. 25Mpa, pressed into a round cake-shaped sample; and then isostatically pressed in an isostatic press under a pressure of 150MPa to obtain a molded green body;

[0058] (3) Dry the molded green body obtained in step (2) and place...

Embodiment 2

[0062] The specific raw material components of gadolinium oxide ceramics are as follows: 99 parts of gadolinium oxide and 1 part of titanium oxide.

[0063] The preparation method steps are as follows:

[0064] (1) According to the above mass parts, use absolute ethanol as the medium for gadolinium oxide and titanium oxide, and use zirconia ball stone as the grinding medium, mix the planetary ball mill in the polyurethane ball mill tank for 2 hours, and dry the slurry mixed by ball milling under vacuum conditions dry, mixed powder;

[0065] (2) The mixed powder obtained in step (1) is added with a binder (5%wt PVA aqueous solution) of 5‰ of the total mass of the mixed powder, added to a cylindrical abrasive tool, and pre-pressed with a hydraulic press. 30Mpa, pressed into a round cake-shaped sample; and then isostatically pressed under a pressure of 180MPa in an isostatic press to obtain a molded green body;

[0066] (3) Dry the molded green body obtained in step (2) and pla...

Embodiment 3

[0070] The specific raw material components of gadolinium oxide ceramics are as follows: 99 parts of gadolinium oxide and 1 part of aluminum oxide.

[0071] The preparation method steps are as follows:

[0072] (1) According to the above mass parts, use absolute ethanol as the medium for gadolinium oxide and aluminum oxide, and use zirconia ball stone as the grinding medium, mix the planetary ball mill in the polyurethane ball mill tank for 5 hours, and dry the slurry mixed by ball milling under vacuum conditions dry, mixed powder;

[0073] (2) The mixed powder obtained in step (1) is added with a binder (5%wt PVA aqueous solution) of 5‰ of the total mass of the mixed powder, added to a cylindrical abrasive tool, and pre-pressed with a hydraulic press. 15Mpa, pressed into a round cake-shaped sample; and then isostatically pressed in an isostatic press under a pressure of 100MPa to obtain a molded green body;

[0074] (3) Dry the molded green body obtained in step (2) and pla...

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Abstract

The invention relates to gadolinium oxide ceramics and a method for manufacturing the same. The gadolinium oxide ceramics comprise, by weight, 95-99.5 parts of gadolinium oxide powder and 0.5-5 parts of yttrium aluminum garnet or 95-99.5 parts of gadolinium oxide powder and 0.5-5 parts of titanium dioxide or 95-99.5 parts of gadolinium oxide powder and 0.5-5 parts of aluminum oxide. The method includes proportioning materials, mixing the materials with one another by means of ball-milling to obtain mixtures, and drying the mixtures in vacuum environments; adding adhesive into the mixtures, carrying out pre-press molding under the pressures of 15-30MPa, and carrying out isostatic-press molding under the pressures of 100-180MPa to obtain molded blanks; drying the blanks, heating the blanks until the temperatures of the blanks reach 1400-1650 DEG C, sintering the blanks in oxidizing atmosphere under heat-insulation conditions and cooling the blanks to obtain the gadolinium oxide ceramics. Water ethanol is used as a medium when the materials are mixed with one another, and zirconia ball stone is used as a grinding medium when the materials are mixed with one another. The gadolinium oxide ceramics and the method have the advantages that the gadolinium oxide ceramics are high in relative density, gadolinium content and neutron absorption capacity, and the problem of easiness in pulverization of existing gadolinium oxide ceramics due to the fact that the existing gadolinium oxide ceramics are soaked in hot water for a long time can be solved.

Description

technical field [0001] The invention relates to a gadolinium oxide ceramic and a preparation method thereof, in particular to a preparation method of pressureless sintering dense gadolinium oxide ceramics in an oxidizing atmosphere, and belongs to the technical field of nuclear industry protective materials. Background technique [0002] In nuclear reactor core assemblies, neutron absorbing materials are important functional components next to fuel components. Commonly used absorbent materials include B 4 C. Boron steel, Ag-In-Cd alloy, etc. Among them, the application proportion of boron materials such as boron carbide and boron steel is very large. However, due to 10 B undergoes (n,α) reaction, and boron-containing materials produce helium gas when irradiated, forming helium bubbles, causing expansion, leading to material failure, and limiting the application of boron-containing materials. [0003] The absorption cross sections of many rare earth elements for thermal ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622
Inventor 张玉军赵佳星龚红宇张羽白李其松
Owner SHANDONG UNIV
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