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Accident-resistant fuel core cladding tube and preparation method thereof

A core cladding tube and fuel technology, which is applied in the field of accident-resistant fuel nuclear cladding tubes and their preparation, can solve problems such as reducing the mechanical properties of the cladding tubes, overcome catastrophic accidents, alleviate thermal expansion coefficient mismatches, and prevent interfacial reactions. Effect

Inactive Publication Date: 2018-12-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Under high temperature and irradiation conditions, refractory metals will undergo violent diffusion and chemical reactions with the ceramic matrix to form brittle carbides or silicides, which will not only form new pores but also reduce the mechanical properties of the cladding tube

Method used

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  • Accident-resistant fuel core cladding tube and preparation method thereof
  • Accident-resistant fuel core cladding tube and preparation method thereof
  • Accident-resistant fuel core cladding tube and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] (1) A SiC fiber preform with a thickness of 400 μm is braided outside a hollow graphite tube with a diameter of 9 mm. Then the obtained SiC fiber prefabricated body was hung on the supporting sample holder of the vacuum furnace, and the prefabricated body was located in the center of the isothermal zone in the furnace, and the PyC interface was deposited on the above SiC fiber by CVI process. Deposition process parameters: precursor gas source adopts propylene (C 3 h 6 ), the deposition temperature is 800°C, the deposition pressure is 2kPa, the deposition is 20h, and the PyC interface with a thickness of 100nm is deposited. Finally, trichloromethylsilane (CH 3 SiCl 3 , MTS), hydrogen (H 2 ) and diluent gas argon (Ar), where H 2 The molar mixing ratio with MTS is 10:1. Keep the pressure in the furnace at 2kPa, deposit the SiC matrix in the temperature range of 1000°C, and the deposition time is 400h.

[0058] (2) Grinding the outer surface of the inner tube layer ...

Embodiment 2

[0063] (1) A SiC fiber preform with a thickness of 300 μm is braided outside a hollow graphite tube with a diameter of 9 mm. Then the obtained SiC fiber prefabricated body was hung on the supporting sample holder of the vacuum furnace, and the prefabricated body was located in the center of the isothermal zone in the furnace, and the PyC interface was deposited on the above SiC fiber by CVI process. Deposition process parameters: precursor gas source adopts propylene (C 3 h 6 ), the deposition temperature is 900°C, the deposition pressure is 2kPa, the deposition is 30h, and the PyC interface with a thickness of 200nm is deposited. Finally, trichloromethylsilane (CH 3 SiCl 3 , MTS), hydrogen (H 2 ) and diluent gas argon (Ar), where H 2 The molar mixing ratio with MTS is 10:1. Keep the pressure in the furnace at 2kPa, deposit the SiC substrate at a temperature range of 900°C, and the deposition time is 300h.

[0064](2) Grinding the outer surface of the inner tube layer w...

Embodiment 3

[0069] (1) A SiC fiber preform with a thickness of 300 μm is braided outside a hollow graphite tube with a diameter of 9 mm. Then the obtained SiC fiber prefabricated body was hung on the supporting sample holder of the vacuum furnace, and the prefabricated body was located in the center of the isothermal zone in the furnace, and the PyC interface was deposited on the above SiC fiber by CVI process. Deposition process parameters: precursor gas source adopts propylene (C 3 h 6 ), the deposition temperature is 800°C, the deposition pressure is 2kPa, the deposition is 20h, and the PyC interface with a thickness of 100nm is deposited. Finally, trichloromethylsilane (CH 3 SiCl 3 , MTS), hydrogen (H 2 ) and diluent gas argon (Ar), where H 2 The molar mixing ratio with MTS is 10:1. Keep the pressure in the furnace at 2kPa, deposit the SiC matrix in the temperature range of 1000°C, and the deposition time is 400h.

[0070] (2) Grinding the outer surface of the inner tube layer ...

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Abstract

The invention relates to an accident-resistant fuel core cladding tube and a preparation method thereof. The accident-resistant fuel core cladding tube is a sandwich multilayered structure formed by alternately superimposing a continuous SiC fiber toughened SiC ceramic matrix composite material and a refractory metal layer according to design requirements. According to the multilayered structure,the continuous SiC fiber toughened SiC ceramic matrix composite material is used as an inner tube layer, the refractory metal layer is used as an intermediate tube layer, and the continuous SiC fibertoughened SiC ceramic matrix composite material is used as an outer tube layer. In the multilayered structure, the continuous SiC fiber toughened SiC ceramic matrix composite material layer mainly plays a support and bearing role, and the refractory metal layer mainly plays a sealing antiseep role. The accident-resistant fuel core cladding tube of the invention can maintain the airtightness of thecore cladding tube when the stress exceeds the elastic deformation range of the ceramic matrix composite material and the crack has been expanded in the composite material.

Description

technical field [0001] The invention relates to an accident-resistant fuel nuclear cladding tube and a preparation method thereof, in particular to a multilayer SiC f The invention discloses a method for preparing a nuclear cladding tube composed of SiC ceramic matrix composite material and refractory metal. This nuclear cladding tube is mainly used for forming and protecting nuclear fuel rods in fourth-generation gas-cooled fast neutron nuclear reactors. The accident-resistant fuel nuclear cladding tube prepared by the method can also be used in other nuclear reactors, such as pressurized water reactors, boiling water reactors, and sodium-cooled fast neutron reactors. Background technique [0002] Ceramic matrix composites have attracted much attention because of their low density, high specific strength, high specific modulus, oxidation resistance, fatigue creep resistance, insensitivity to cracks, and no catastrophic damage. In addition, ceramic matrix composites still h...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/622C04B41/88C04B41/87C04B41/90G21C3/06
CPCC04B35/573C04B35/622C04B35/806C04B41/5001C04B41/5031C04B41/5133C04B41/52C04B41/87C04B41/88C04B41/90C04B2235/614G21C3/06C04B41/4531C04B41/522C04B41/524Y02E30/30
Inventor 李晓强秦海龙刘传歆成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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