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al for nuclear power 2 o 3 -gd 2 o 3 Burnable poison ceramic material and preparation method thereof

A technology of ceramic materials and poisons, applied in the field of Al2O3-Gd2O3 burnable poison ceramic materials for nuclear power and its preparation, can solve the problems of hydrogen embrittlement corrosion and internal uniformity of zirconium alloy cladding materials that cannot further improve the safety and economy of nuclear power operation Difficult to control and other issues, to achieve high academic value and engineering application value, best chemical stability, purity and good crystal structure

Active Publication Date: 2021-04-13
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite ceramic materials prepared by the above methods all have disadvantages such as difficult control of internal uniformity, difficulty in densification, many internal pores and defects, and a large amount of dust is generated during the preparation process, which pollutes the environment and damages the health of personnel.
[0004] And, since Al 2 o 3 -Gd 2 o 3 When the porosity of the composite ceramic material is too large, it will absorb water vapor and cause hydrogen embrittlement corrosion of the zirconium alloy cladding material; Al 2 o 3 Matrix and Gd 2 o 3 Al 2 o 3 -Gd 2 o 3 The performance of composite ceramic materials under high temperature conditions also has an important influence
Therefore, Al prepared by existing methods 2 o 3 -Gd 2 o 3 Burnable poison material can not further improve the safety and economical purpose of nuclear power operation; and there is no document record how to prepare Al which is suitable for PWR nuclear fuel element. 2 o 3 -Gd 2 o 3 Methods of Burning Poisonous Materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of Al for nuclear power 2 o 3 -Gd 2 o 3 A method for preparing a burnable poison ceramic material, comprising:

[0034] The first step, take by weighing 148g analytical pure Al (NO 3 ) 3 9H 2 O was put into a beaker, and 90ml of deionized water was added to it, and under rapid stirring conditions, 5ml of concentrated nitric acid was added to dissolve it to obtain a stable Al(NO 3 ) 3 solution. According to the mass ratio of gadolinium trioxide in the material, weigh 7.8g of dried gadolinium trioxide powder and put it into the dissolution tank, add 35ml of deionized water to it, and add 8ml of concentrated nitric acid to dissolve it under rapid stirring conditions , after dissolving for 27min, the clear filtrate after filtering out the insoluble matter is Gd(NO 3 ) 3 solution. The prepared Gd(NO 3 ) 3 The solution was slowly dropped into the Al(NO 3 ) 3 solution solution, and kept stirring for 25min to form a uniform Gd(NO 3 ) 3 and Al(NO 3 ) 3 ...

Embodiment 2

[0038] The difference between this embodiment and Embodiment 1 is that the specific process parameters of each step in this embodiment are different, and the specific settings are as follows:

[0039] In the second step, the pH value of the mixed solution was maintained at around 8 during the reaction.

[0040] In the third step, the holding temperature of the precursor powder is 500° C., and the holding time is 5 hours; the vacuum sintering temperature is 1600° C., and the holding time is 4.5 hours.

Embodiment 3

[0042] The difference between this embodiment and Embodiment 1 is that the specific process parameters of each step in this embodiment are different, and the specific settings are as follows:

[0043] In the third step, the holding temperature of the precursor powder is 520° C., and the holding time is 4 hours; the vacuum sintering temperature is 1630° C., and the holding time is 4 hours.

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PUM

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Abstract

The invention discloses Al for nuclear power 2 o 3 -Gd 2 o 3 The burnable poison ceramic material and its preparation method solve the Al 2 o 3 -Gd 2 o 3 The problem of burnable poisonous materials. The present invention includes (1) preparing Gd(NO 3 ) 3 and Al(NO 3 ) 3 Mixed solution of saturated (NH 4 ) 2 CO 3 solution; (2) will be saturated (NH 4 ) 2 CO 3 The solution is added to the mixed solution to react, and the precipitate is obtained after the reaction; (3) the precipitate is washed and dried to obtain the precursor powder; (4) the precursor powder is placed at 480-520°C for 4-6 hours and then taken out for grinding Obtaining a powder; (5) pressing the powder into shape, and then sintering to obtain a finished product. The invention has the advantages of high density and high strength, is suitable for advanced nuclear power water-cooled power reactors, and has high inherent safety.

Description

technical field [0001] The invention relates to the field of composite ceramic materials, in particular to an Al 2 o 3 -Gd 2 o 3 Burnable poison ceramic material and preparation method thereof. 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 accelerate swelling, but also reduce their chemical stability, which can affect the safety and economics of nuclear r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/02
CPCG21C21/02Y02E30/30
Inventor 王辉杜沛南潘东孙永铎潘小强解怀英邱绍宇
Owner NUCLEAR POWER INSTITUTE OF CHINA