Structure and preparation method of nuclear fuel cladding tube with crack expansion resisting capability

A technology for nuclear fuel and cladding tubes, applied in reactor fuel elements, nuclear engineering, nuclear power generation, etc., can solve problems such as hydrogen explosions and nuclear fuel leakage accidents, and achieve the effect of preventing cracks

Inactive Publication Date: 2016-03-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Structure and preparation method of nuclear fuel cladding tube with crack expansion resisting capability
  • Structure and preparation method of nuclear fuel cladding tube with crack expansion resisting capability
  • Structure and preparation method of nuclear fuel cladding tube with crack expansion resisting capability

Examples

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Effect test

Embodiment 1

[0033] Example 1: Choose C f Four-layer SiC-based cladding tube with SiC / SiC composite as anti-crack propagation layer. The modulus of elasticity of SiC ceramics is 400-440GPa, while C f The modulus of the / SiC composite material is only 75-85GPa. Therefore it is difficult for the crack to pass through the C f / SiC composite material layer expands radially to the SiC ceramic layer, and the C f Compared with ceramics, the / SiC composite material has better toughness and can prevent the generation and expansion of cracks, thereby better protecting the sub-inner SiC ceramic layer.

[0034] Specific implementation method:

[0035] 1. Preparation of inner layer:

[0036] 1) Using the weaving process, the carbon fiber is made into a tubular fiber prefabricated body with a size of Ф0.9cm×100cm;

[0037] 2) Then deposit a layer of pyrolytic carbon on the carbon fiber preform as a composite material interface layer;

[0038] 3) Using PIP, CVI, RMI or other densification process,...

Embodiment 2

[0045] Example 2: Select SiC f Four-layer SiC-based cladding tube with SiC / SiC composite as anti-crack propagation layer. The modulus of elasticity of SiC ceramics is 400-440GPa, while SiCf The modulus of the / SiC composite material is 150-200GPa. Therefore it is difficult for cracks to pass through SiC f The / SiC composite material layer expands radially to the SiC ceramic layer, and the SiC f Compared with ceramics, the / SiC composite material has better toughness and can prevent the generation and expansion of cracks, thereby better protecting the sub-inner SiC ceramic layer.

[0046] Specific implementation method:

[0047] 1. Preparation of inner layer:

[0048] 1) Using the weaving process, the silicon carbide fiber is made into a round tubular fiber prefabricated body with a size of Ф0.9cm×100cm;

[0049] 2) Depositing a layer of pyrolytic carbon on the silicon carbide fiber prefabricated body as a composite material interface layer;

[0050] 3) Using PIP, CVI, RM...

Embodiment 3

[0057] Example 3: A four-layer SiC-based cladding tube with metal zirconium selected as the anti-crack propagation layer. The elastic modulus of SiC ceramics is 400-440GPa, while the elastic modulus of metal zirconium is 88-100GPa. Therefore, it is difficult for cracks to spread radially through the metal zirconium layer to the SiC ceramic layer, and metal zirconium has better toughness than ceramics, which can prevent the generation and propagation of cracks, thereby better protecting the inner SiC ceramic layer.

[0058] Specific implementation method:

[0059] 1. Preparation of the inner layer: the metal zirconium tube is prepared by CVD process, the size is Ф0.9cm×100cm, and the thickness is 100-500μm;

[0060] 2. Preparation of the second inner layer:

[0061] 1) Clean and dry the surface of the zirconium tube;

[0062] 2) Then brush a layer of SiC precursor on the outer surface, and crack it at 900°C for 1 hour under Ar gas atmosphere to form a layer of SiC ceramic la...

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Abstract

The invention relates to a structure and a preparation method of a nuclear fuel cladding tube with a crack expansion resisting capability. The structure comprises a two-layered or three-layered SiC-based nuclear fuel cladding tube, and is characterized in that an inner layer of the SiC-based nuclear fuel cladding tube is used as a secondary inner layer structure; one layer of a crack expansion resisting layer is introduced into the interior of a secondary inner layer to be used as an inner layer structure, so that a three-layered or four-layered SiC-based nuclear fuel cladding tube is formed; the modulus of the material of the introduced inner layer structure is lower than that of an anti-irradiation material with low modulus of a SiC material of the secondary inner layer. By virtue of the three-layered or four-layered SiC-based nuclear fuel cladding tube, the effect of preventing cracks from being formed on a SiC ceramic layer of the inner wall of the nuclear fuel cladding tube.

Description

technical field [0001] The invention belongs to the design of nuclear fuel cladding tubes, and in particular relates to a structure and a preparation method of nuclear fuel cladding tubes capable of resisting crack propagation. Background technique [0002] Nuclear energy is widely used as a clean energy. However, after the Fukushima accident, people paid more and more attention to the safety of nuclear power plants. In early nuclear reactor devices, zirconium or zirconium alloys were mostly used as cladding tube materials. However, in the event of an accident, the temperature of the nuclear reactor rises sharply, and the phase transition of zirconium or zirconium alloys causes volume changes, which eventually leads to the rupture of the cladding tube wall, and its corrosion resistance to water is poor at high temperatures. Therefore, it is particularly important to improve the ability of nuclear fuel cladding tubes to deal with accidents. SiC ceramics and their composite...

Claims

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Application Information

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IPC IPC(8): G21C3/07G21C21/02
CPCG21C3/07G21C21/02Y02E30/30
Inventor 王一光周浩成来飞张立同李晓强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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