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Rapid preparation method and product of uranium dioxide/nano-diamond nuclear fuel pellet

A technology of nano-diamond and nano-diamond powder, which is applied in the fields of energy, composite materials, and powder metallurgy. It can solve the problems of poor thermal conductivity and difficulty in meeting the safety requirements of nuclear power plants, and achieve high yield, high temperature stability and radiation stability. The effect of performance and process simplification

Active Publication Date: 2018-09-14
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

[0005] The object of the invention is to: for existing ceramic type uranium dioxide (UO 2 ) pellets have poor thermal conductivity and are difficult to meet the safety requirements of nuclear power plants, and provide a rapid preparation method for uranium dioxide / nanodiamond nuclear fuel pellets and its products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Put uranium dioxide raw material powder into a cemented carbide mold, and perform cold-press preforming. The pressure of cold-press preforming is 80MPa, and the pressure is maintained for 15 minutes. After demoulding, grind and crush, and pass through a 12-50 mesh metal screen to obtain low-density porous uranium dioxide particles with a density of 3.51g / cm 3 , the porosity is 68%.

[0040] 2) Fill the prepared low-density porous uranium dioxide particles and nano-diamond powder into a nylon tank at a volume fraction of 99:1; wherein, the diamond particle size ranges from 30nm to 200nm. Put it on a horizontal ball mill to rotate at a low speed, the speed of the ball mill is 60r / min, the nano-diamond adsorption time is 5h, without adding any grinding media and balls, and pumping negative pressure protection. After the ball milling is completed, microcellular structure particles are obtained. During the process, nano-diamond powder is adsorbed on the surface of urani...

Embodiment 2

[0045] 1) Put the uranium dioxide raw material powder into a cemented carbide mold, and perform cold preforming. The pressure of the cold preforming is 200MPa, and the pressure holding time is 5min. After demoulding, grind and crush, and pass through a 30-75 mesh metal screen to obtain low-density porous uranium dioxide particles with a density of 4.93g / cm 3 , the porosity is 55%.

[0046] 2) Fill the prepared low-density porous uranium dioxide particles and nano-diamond powder into a nylon tank at a volume fraction of 99:5. Among them, the nano-diamond powder particle size ranges from 60nm to 300nm, and it is placed on a horizontal ball mill to rotate at a low speed. . After the ball milling is completed, microcellular structure particles are obtained. During the process, nano-diamond powder is adsorbed on the surface of uranium dioxide particles to form a microcellular structure.

[0047] 3) The prepared microcellular structure particles were loaded into a graphite mold,...

Embodiment 3

[0051] 1) Put uranium dioxide raw material powder into a cemented carbide mold, and carry out cold preforming. The pressure of cold preforming is 400MPa, and the pressure holding time is 3min. After demoulding, grind and crush, and pass through a 50-100 mesh metal screen to obtain low-density porous uranium dioxide particles with a density of 5.48g / cm 3 , with a porosity of 50%.

[0052] 2) Fill the prepared low-density porous uranium dioxide particles and nano-diamond powder into a nylon tank with a volume ratio of 99:10. Among them, the nano-diamond powder particle size ranges from 200nm to 500nm, and it is placed on a horizontal ball mill to rotate at a low speed. . After the ball milling is completed, microcellular structure particles are obtained. During the process, nano-diamond powder is adsorbed on the surface of uranium dioxide particles to form a microcellular structure.

[0053] 3) The prepared microcellular structure particles were loaded into a graphite mold, ...

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Abstract

The invention discloses a rapid preparation method and a product of a uranium dioxide / nano-diamond nuclear fuel pellet, and belongs to the field of energy and composite materials, particularly belongsto the field of powder metallurgy, and aims to solve the problems that safety requirements of a nuclear power station are difficultly met as heat conductivity of an existing ceramic uranium dioxide (UO2) pellet is poor. According to the method, the uranium dioxide / nano-diamond nuclear fuel pellet with a three-dimensional network structure is prepared by a powder metallurgy technique, the heat conductivity of uranium dioxide nuclear fuel is improved, high-temperature stability and radiation stability of the fuel pellet are improved, the method can effectively solves the problems, safety of theuranium dioxide nuclear fuel pellet is greatly improved, industrial large-scale production application requirements can be met, the method has high application value and good application prospect andis worthy of large-scale popularization and application.

Description

technical field [0001] The invention relates to the field of energy and composite materials, in particular to the field of powder metallurgy, in particular to a method for preparing uranium dioxide / nano-diamond nuclear fuel pellets. Background technique [0002] At present, the most mature nuclear fuel used in commercial light water reactors is ceramic uranium dioxide (UO 2 ), which has the following advantages: the thermal neutron capture cross section of the non-fission combination element oxygen is low, the melting point is high, the chemical and structural aspects have high radiation stability, and the manufacturing cost is low. [0003] However, the significant disadvantage of uranium dioxide nuclear fuel is its poor thermal conductivity (300k thermal conductivity is 7.7 W / m . k), only one-tenth of that of metal uranium. The poor thermal conductivity of uranium dioxide fuel pellets directly affects the safety and economy of nuclear power plants, which are related to t...

Claims

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Application Information

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IPC IPC(8): G21C3/62G21C21/02
CPCG21C3/62G21C3/623G21C21/02Y02E30/30
Inventor 程亮张鹏程高瑞杨振亮李冰清褚明福刘朋闯严彪杰段丽美王志毅刘徐徐钟毅黄奇奇
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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