Nanometer uranium dioxide and preparation method of composite material powder thereof

A technology of uranium dioxide and composite materials, which is applied in the field of preparation of nano-uranium dioxide and its composite material powder, which can solve problems such as inability to dissipate heat, rise in core temperature, and rupture of cladding tubes, and achieve good accommodation for fission Gas ability, simple preparation method, and the effect of inhibiting radiation damage

Active Publication Date: 2018-07-20
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In an accident state, the cooling system of the reactor fails, the heat in the reactor cannot be dissipated, the temperature of the core rises rapidly, and the exothermic oxidation reaction and hydrogen release reaction between the metal Zr cladding and water vapor are intensified at high temperature, releasing A large amount of heat and hydrogen, the hydrogen explodes at high t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Step 1: Dissolve uranyl acetate and hexamethylenetetramine in deionized water respectively to obtain a mixed solution, the concentration of uranyl acetate in the mixed solution is 0.01mol / L, and the concentration of hexamethylenetetramine is 0.001mol / L; After stirring evenly, react at 60°C for 0.1h;

[0020] Step 2: After cooling, centrifuge the obtained precipitate, wash it with alcohol and deionized water, and finally dry it at 60-100°C to obtain nano-uranium dioxide.

example 2

[0022] Step 1: Dissolve uranyl nitrate and urea in deionized water respectively to obtain a mixed solution. The concentration of uranyl nitrate in the mixed solution is 0.5 mol / L, and the concentration of urea is 0.5 mol / L; Reaction under the conditions for 12h;

[0023] Step 2: After cooling, centrifuge the obtained precipitate, wash it with alcohol and deionized water, and finally dry it at 60-100°C to obtain nano-uranium dioxide.

example 3

[0025] Step 1: Dissolve uranyl acetate, hydrazine hydrate, and graphene in deionized water respectively to obtain a mixed solution B. The concentration of the precursor in the mixed solution B is 0.5mol / L, and the concentration of hydrazine hydrate is 0.01mol / L. The olefin concentration is 0.1g / L; after stirring evenly, react at 80°C for 8h;

[0026] Step 2: After cooling, centrifuge the obtained precipitate, wash it with alcohol and deionized water, and finally dry it at 60-100°C to obtain nano-uranium dioxide.

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PUM

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Abstract

The invention discloses nanometer UO2 used for the preparation of a novel nuclear fuel pellet and a preparation method of compound powder thereof. According to the nanometer UO2 and compound powder thereof (including but not limited to nanometer UO2 powder, nanometer UO2/SiC, nanometer UO2/carbon nanotubes, nanometer UO2/graphene, nanometer UO2/nanometer diamond composite material powder) preparedand obtained by adopting a hydrothermal method or a precipitation method, the prepared and obtained powder can serve as a raw material for preparing the novel nuclear fuel pellet in a nuclear power station, and has the characteristics of high melting point, high heat conduction, good anti-radiation performance, high fission gas accommodating capacity and excellent mechanical property.

Description

technical field [0001] The invention relates to a preparation method of nano uranium dioxide and its composite material powder. Background technique [0002] Uranium dioxide (UO 2 ) is currently the most widely used nuclear fuel in commercial nuclear reactors. It has excellent thermal, chemical, and radiation stability, as well as high melting point, retention of solid fission products, and strong ability to block the diffusion of gaseous fission products. However, relying on the characteristics of phonon heat transfer causes its thermal conductivity to drop sharply under high temperature and irradiation conditions, and its heat export ability declines rapidly. Therefore, the current UO 2 The operating temperature of the -Zr nuclear fuel system is only 700-1200°C. In an accident state, the cooling system of the reactor fails, the heat in the reactor cannot be dissipated, the temperature of the core rises rapidly, and the exothermic oxidation reaction and hydrogen release ...

Claims

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Application Information

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IPC IPC(8): C01G43/025G21C21/02B82Y30/00
CPCB82Y30/00C01G43/025G21C21/02Y02E30/30
Inventor 高瑞杨振亮李冰清褚明福刘徐徐钟毅段丽美黄奇奇王志毅
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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