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Accident-tolerant nuclear fuel cladding double-layer coating structure and preparation method thereof

A double-layer coating, double-layer cladding technology, applied in the field of nuclear materials

Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to improve the oxidation resistance of nuclear fuel cladding and solve the problem of the eutectic phase formed by the interdiffusion of elements between the traditional anti-oxidation coating and the zirconium alloy substrate in high-temperature steam (above 1000 ° C), the invention provides a Accident-tolerant nuclear fuel cladding double-layer coating structure and preparation method thereof

Method used

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  • Accident-tolerant nuclear fuel cladding double-layer coating structure and preparation method thereof
  • Accident-tolerant nuclear fuel cladding double-layer coating structure and preparation method thereof
  • Accident-tolerant nuclear fuel cladding double-layer coating structure and preparation method thereof

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Embodiment 1

[0032] The preparation method of the accident-tolerant nuclear fuel cladding double-layer coating structure in this embodiment includes the following steps:

[0033] Sandblasting is performed on the surface of the zirconium alloy plate first to improve its bonding ability with metal powder.

[0034] Use a 500-mesh sieve to screen out Ta, Ti, W, V and Cr metal powders with particle diameters below 30 μm. Prepare W55Ta20Ti10V10Cr5 alloy powder according to mass percentage.

[0035] Dry the above alloy powder in a drying oven for 30 minutes at a drying temperature of 100°C.

[0036] Use PCS-2000 type cold spraying instrument to cold spray diffusion barrier layer on the surface of zirconium alloy plate. The specific process parameters are: air pressure 4Mpa, gas temperature 750℃, alloy powder feed rate 0.25rpm, spray gun moving speed 800mm / s .

[0037] The cold spray gun is used to feed low-speed, large-size micro-forged particles, and through the hammering and forging action of ...

Embodiment 2

[0043] The preparation method of the accident-tolerant nuclear fuel cladding double-layer coating structure in this embodiment includes the following steps:

[0044] Sandblasting is performed on the surface of the zirconium alloy plate first to improve its bonding ability with metal powder.

[0045] Use a 500-mesh sieve to screen out Ta, Ti, W, V and Cr metal powders with particle diameters below 30 μm. According to the mass percentage, the alloy powder of Ta45W25Ti15V5Cr5 is prepared.

[0046] Dry the above alloy powder in a drying oven for 30 minutes at a drying temperature of 100°C.

[0047] PCS-2000 cold spraying equipment is used to cold spray the diffusion barrier layer on the surface of the zirconium alloy plate. The specific process parameters are: air pressure 4.5Mpa, gas temperature 800 ℃, alloy powder feed rate 0.35rpm, spray gun moving speed 850mm / s.

[0048] The cold spray gun is used to feed low-speed, large-size micro-forged particles, and through the hammer...

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Abstract

The invention discloses an accident-tolerant nuclear fuel cladding double-layer coating structure and a preparation method thereof. The double-layer structure composite coating structure design of a diffusion barrier layer bottom layer with a high temperature oxidation resistant top layer can have comprehensive characteristics of both high temperature oxidation corrosion resistance and strong interface bonding; the components of the diffusion barrier layer material comprise Ta, Ti, W, V and Cr; the mass percentages of each element of the diffusion barrier layer are that Ta+Ti+W is greater thanor equal to 70% and less than or equal to 100%, and V+Cr is less than or equal to 30.0%, the material of the anti-oxidation layer is one of FeCrAl, Ti2AlC, TiN, ZrC or SiC, the thickness of the diffusion barrier layer accounts for 5%-40% of the entire coating thickness, the thickness of the high temperature oxidation resistant layer accounts for 60%-95% of the entire coating thickness, the totalthickness of the double-layer coating structure is 5[mu]m-500[mu]m, and the total thickness of the coating structure does not exceed 25% of the thickness of a zirconium alloy substrate.

Description

technical field [0001] The invention belongs to the technical field of nuclear materials, and specifically relates to an accident-tolerant nuclear fuel cladding double-layer coating structure and a preparation method thereof. A diffusion barrier layer and a high-temperature oxidation-resistant coating are prepared on the surface of a zirconium alloy cladding by cold spraying. Therefore, the purpose of improving the anti-oxidation ability of the accident-tolerant nuclear fuel cladding is achieved. Background technique [0002] Zirconium alloy has excellent nuclear properties (the thermal neutron absorption cross section is only 1.85×10 -29 m 2 ) and corrosion resistance (corrosion resistance in high temperature and high pressure water vapor at 300°C-400°C), as well as moderate mechanical properties, good processing properties, and good compatibility with uranium fuel, are widely used in nuclear power pressurized water reactors Fuel cladding tube. However, under severe acci...

Claims

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Application Information

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IPC IPC(8): C23C24/04G21C3/07
CPCC23C24/04G21C3/07Y02E30/30
Inventor 柳文波师田田雒晓涛谢秦恽迪刘俊凯
Owner XI AN JIAOTONG UNIV
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