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A kind of coated fuel particle containing carbide-refractory metal coating layer and preparation method thereof

A technology for coating fuel particles and refractory metals, applied in the direction of reactor fuel materials, reactor fuel elements, manufacturing reactors, etc., can solve the problems of low compatibility and low compatibility of metal substrates that are prone to damage, and is conducive to rapid prototyping and simplification Preparation process, effect of design optimization

Active Publication Date: 2022-01-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems that the existing all-ceramic coated fuel particles are prone to damage during press molding and have low compatibility with the metal matrix, the present invention provides a new type of coated fuel containing carbide-refractory metal cladding layer Granules and methods for their preparation

Method used

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  • A kind of coated fuel particle containing carbide-refractory metal coating layer and preparation method thereof
  • A kind of coated fuel particle containing carbide-refractory metal coating layer and preparation method thereof
  • A kind of coated fuel particle containing carbide-refractory metal coating layer and preparation method thereof

Examples

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Embodiment 1

[0042] A new type of coated fuel particles, the schematic diagram of its structure is shown in figure 1 , the new coated fuel particles include a uranium dioxide ceramic fuel core and a loose layer of pyrolytic carbon, an inner transition layer of pyrolytic carbon, a silicon carbide coating, and a pyrolytic carbon layer coated sequentially outside the ceramic fuel core. Carbon outer transition layer and metallic zirconium coating;

[0043] Wherein, the uranium dioxide ceramic fuel core is a sphere with a diameter of 500-600 μm;

[0044] The density of the pyrolytic carbon loose layer is 0.8g / cm 3 , the porosity is 62%, and the thickness is 90-100μm.

[0045] The inner transition layer of the pyrolytic carbon has a thickness of 20-30 μm and a density of 1.9 g / cm 3 ;

[0046] The thickness of the silicon carbide cladding layer is 30-35 μm;

[0047] The thickness of the outer transition layer of pyrolytic carbon is 1-2 μm;

[0048] The thickness of the metal zirconium clad...

Embodiment 2

[0059] A novel coated fuel particle, the novel coated fuel particle comprises a uranium nitride ceramic fuel core and a silicon carbide loose layer, a pyrolytic carbon inner transition layer, and niobium carbide which are sequentially coated on the outside of the ceramic fuel core cladding layer, pyrolytic carbon outer transition layer and metal niobium cladding layer;

[0060] Wherein, the uranium nitride ceramic fuel core is a sphere with a diameter of 800-900 μm;

[0061] The density of the silicon carbide loose layer is 2.0g / cm 3 , the porosity is 38%, and the thickness is 90-100μm.

[0062] The inner transition layer of the pyrolytic carbon has a thickness of 10-15 μm and a density of 1.9 g / cm 3 ;

[0063] The thickness of the niobium carbide cladding layer is 30-35 μm;

[0064] The thickness of the outer transition layer of pyrolytic carbon is 2-3 μm;

[0065] The thickness of the metal niobium cladding layer is 30-40 μm.

[0066] The preparation method of above-me...

Embodiment 3

[0075] A new type of coated fuel particles, the schematic diagram of its structure is shown in figure 1 , the new coated fuel particles include a uranium carbon oxide (UCO) ceramic fuel core and a pyrolytic carbon loose layer, a pyrolytic carbon inner transition layer, and a zirconium carbide coating layer that are sequentially coated on the outside of the ceramic fuel core , Pyrolytic carbon outer transition layer and zirconium-tantalum alloy cladding layer;

[0076] Wherein, the UCO ceramic fuel core is a sphere with a diameter of 600-700 μm;

[0077] The density of the pyrolytic carbon loose layer is 1.0g / cm 3 , the porosity is 52%, and the thickness is 70-80μm.

[0078] The inner transition layer of the pyrolytic carbon has a thickness of 20-25 μm and a density of 1.8 g / cm 3 ;

[0079] The thickness of the zirconium carbide cladding layer is 50-55 μm;

[0080] The thickness of the outer transition layer of pyrolytic carbon is 3-4 μm;

[0081] The thickness of the zi...

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Abstract

The embodiment of the present invention relates to the field of nuclear fuel, and in particular to a coated fuel particle containing a carbide-refractory metal coating layer and a preparation method thereof. The coated fuel particle provided by the embodiment of the present invention includes a ceramic fuel core and a loose layer, an inner transition layer, a carbide coating layer, an outer transition layer, and a refractory metal cladding sequentially coated on the outside of the ceramic fuel core. cladding. The coated fuel particles provided by the embodiments of the present invention are newly designed coated fuel particles that introduce a refractory metal coating layer, have a ceramic-metal composite layer structure, have good compatibility with the metal matrix, and have high thermal conductivity , strong comprehensive mechanical properties, can resist plastic deformation, anti-friction and wear, and can serve at extremely high temperatures, broaden the application field of coated fuel particles, and provide technical reserves for the preparation of fuel elements for the next generation of new nuclear energy systems; and, can Simplify the preparation process of coated fuel particles dispersed in the matrix.

Description

technical field [0001] The invention relates to the field of nuclear fuel, in particular to a coated fuel particle containing a carbide-refractory metal coating layer and a preparation method thereof. Background technique [0002] The high-temperature gas-cooled reactor with inherent safety is one of the fourth-generation advanced reactor types. The important guarantee of its safety is the use of all-ceramic coated fuel particles to bind various gases and solid fission products. The all-ceramic coated fuel particles include a nuclear fuel core and a loose pyrolytic carbon layer, an inner dense pyrolytic carbon layer, a silicon carbide layer and an outer dense pyrolytic carbon layer that are sequentially coated on the outside. The successful application of coated fuel particles in high-temperature gas-cooled reactors has also proved its important potential in other nuclear energy systems, and it is expected to be used in other reactor-type commercial nuclear power plants and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/62G21C21/00C04B41/90
CPCG21C3/62G21C3/626G21C21/00C04B41/90C04B41/52C04B41/009C04B35/01C04B35/58C04B35/5603C04B41/5059C04B41/4531C04B41/5001C04B41/5133Y02E30/30
Inventor 刘荣正程心雨刘马林邵友林刘兵
Owner TSINGHUA UNIV
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