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Co-precipitation preparation method of ZrO2/Gd203 composite ceramic material for nuclear power

A composite ceramic and co-precipitation technology is applied in the field of composite ceramic materials to achieve the effects of easy implementation, good internal uniformity and high density

Active Publication Date: 2013-12-18
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current co-precipitation method has been recognized as a relatively advanced process for the manufacture of ceramic materials, but the preparation of ZrO by co-precipitation 2 / Gd 2 o 3 The research on composite ceramic materials has not been reported at home and abroad after the patent search.

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  • Co-precipitation preparation method of ZrO2/Gd203 composite ceramic material for nuclear power

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 shown.

[0035] A kind of ZrO for nuclear power 2 / Gd 2 o 3 The co-precipitation preparation method of the composite ceramic material comprises a zirconium-gadolinium mixed solution pre-preparation process, and the zirconium-gadolinium mixed solution pre-preparation process includes a zirconium oxynitrate solution preparation step, a gadolinium nitrate solution preparation step and a zirconium-gadolinium mixed solution preparation step, and the specific steps are as follows:

[0036] Preparation steps of zirconyl nitrate solution: dissolving zirconyl nitrate in deionized water to obtain zirconyl nitrate solution;

[0037] Preparation steps of gadolinium nitrate solution: dissolving gadolinium trioxide powder in nitric acid solution to obtain gadolinium nitrate solution;

[0038] Preparation steps of the zirconium-gadolinium mixed solution: mixing the zirconyl nitrate solution and the gadolinium nitrate solution by a double-drop method to obtain the ...

Embodiment 2

[0059] Choose analytically pure zirconyl nitrate and gadolinium trioxide powder as raw materials. Weigh 261g of zirconyl nitrate (ZrO 2 Calculated as 100g) dissolved in an appropriate amount of deionized, weighed 10g of gadolinium trioxide powder and dissolved in an appropriate amount of analytically pure nitric acid solution. Mix the prepared gadolinium nitrate solution with the zirconyl nitrate solution by double drop method, and keep stirring for 25 minutes to form a uniform mixed solution. Add ammonia water dropwise to the mixed solution at a rate of 1.5ml / min, adjust the pH value of the mixed solution, keep the pH value at around 6-8, stir vigorously while adding dropwise to make it fully react, and white precipitates precipitate out. Continue to stir for 1.5-2.5h. The reaction stock solution was left still, aged for 10-15 hours, the supernatant was absorbed, and ammonia water was added dropwise to the clear solution to wash until no white precipitate was produced in th...

Embodiment 3

[0061] Get 261g analytically pure zirconyl nitrate (ZrO 2 calculated as 100g) was dissolved in deionized water to prepare a zirconium oxynitrate solution; 10 g of analytically pure gadolinium trioxide powder was dissolved in an appropriate amount of analytically pure nitric acid solution to prepare a gadolinium nitrate solution; the prepared gadolinium nitrate solution was mixed with double drops It is mixed with zirconyl nitrate solution and stirred continuously for 20 minutes to form a uniform mixed solution.

[0062] Use ammonia water to add dropwise to the mixed solution at a rate of 2ml / min, adjust the pH value of the mixed solution to keep it at about 7, stir vigorously while adding dropwise, make it fully react, white precipitates precipitate, continue to stir for 2h. Put the reaction stock solution still, carry out aging treatment for 10 hours, absorb the supernatant liquid, add ammonia water dropwise to the clear liquid to wash until no white precipitate is produced i...

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Abstract

The invention discloses a co-precipitation preparation method of a ZrO2 / Gd203 composite ceramic material for nuclear power. The co-precipitation preparation method comprises a pre-preparation process of a zirconium-gadolinium mixed solution, a preparation process of zirconium-gadolinium mixed precipitates and the like. The co-precipitation preparation method comprises the following steps of: firstly dissolving and mixing zirconyl nitrate deionized water, gadolinium oxide powder, nitric acid and ammonia water which are used as raw materials, then precipitating and mixing so as to form uniformly mixed preparation raw materials, and finally carrying out follow-up reduction treatment so as to obtain the ZrO2 / Gd203 Gd2O3 composite ceramic material. The co-precipitation preparation method has no strict requirements on processing equipment and is easy to realize. The vacuum sintering is carried out, and the sintering temperature is controlled at 1500 DEG C to 1650 DEG C. The ZrO2 / Gd203 composite ceramic material prepared by the method has good sintering property and relatively good microstructure, mechanical strength and density (theoretical density greater than 96% T.D).

Description

technical field [0001] The invention belongs to a composite ceramic material, in particular to a combustible poison composite ceramic material used in a pressurized water reactor, that is, a ZrO composite material for nuclear power 2 / Gd 2 o 3 Co-precipitation preparation method of composite ceramic material. Background technique [0002] Al is widely used in nuclear power reactors at home and abroad, especially in the core of pressurized water reactor nuclear power plants. 2 o 3 / B 4 C combustible poisonous materials are used to control the initial reactivity of the reactor, to flatten the power distribution of the core, to increase the fuel consumption and to prolong the refueling cycle, thereby reducing the operating cost of nuclear power and improving the safety and reliability of operation. However, with the continuous improvement of the burnup and core power of the new generation of advanced nuclear reactors, Al 2 o 3 / B 4 C burnable poison materials not only a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
CPCY02E30/30
Inventor 王辉黄华伟尹昌耕解怀英
Owner NUCLEAR POWER INSTITUTE OF CHINA
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