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Nuclear fuel cladding pipe and preparation method thereof

A cladding tube and nuclear fuel technology, applied in the direction of reactor fuel elements, nuclear engineering, nuclear power generation, etc., can solve the problems of increasing nuclear reactor operating costs, short service life, distortion and deformation, and achieve good neutron irradiation stability, suppression Oxidation, good thermal shock resistance

Active Publication Date: 2019-11-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the plasticity of zirconium alloys tends to decrease and become brittle after being irradiated by neutrons in the reactor, resulting in radiation swelling or even distortion, the service life is short, only about 1-1.5 years, and it needs to be replaced frequently, greatly improving operating costs of nuclear reactors

Method used

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  • Nuclear fuel cladding pipe and preparation method thereof
  • Nuclear fuel cladding pipe and preparation method thereof
  • Nuclear fuel cladding pipe and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this embodiment, the nuclear fuel cladding tube is made of silicon carbide (SiC) and aluminum silicon carbon ceramic material (Al 4 SiC 4 ) composite material (Al 4 SiC 4 / SiC) composition, its preparation steps are as follows:

[0032] (1) Silicon carbide and precursor polycarbosilane (PCS) were cross-linked and cured at 600°C for 1 hour under an argon protective atmosphere to obtain PCS-600 powder.

[0033] (2) Mix an appropriate amount of PCS-600 powder and Al powder by ball milling, dry in vacuum, and crack at 1100°C for 2 hours under the protection of argon.

[0034] (3) The mixed powder obtained in step 2 is preformed into the shape of a nuclear fuel cladding tube, and then hot-pressed and sintered at 1700°C for 20 minutes to obtain Al 4 SiC 4 / SiC composite nuclear fuel cladding tube.

[0035] Such as figure 1 Shown is the Al prepared above 4 SiC 4 / SiC nuclear fuel cladding tube XRD pattern, it can be seen that the composite material is made of Al 4...

Embodiment 2

[0038] In this embodiment, the nuclear fuel cladding tube is made of silicon carbide (SiC) and aluminum silicon carbon ceramic material (Al 4 SiC 4 ) composite material Al 4 SiC 4 / SiC composition, Al 4 SiC 4 / SiC composite material is prepared by the reaction of liquid hyperbranched polycarbosilane (LHBPCS) and aluminum powder. The specific preparation steps are as follows:

[0039] (1) Mix LHBPCS with an appropriate amount of aluminum powder, and cure in vacuum at 100°C for 2 hours under the combined action of the initiator tert-butyl peroxybenzoate (TBPB);

[0040] (2) After grinding the block solidified in step 1 into powder, it is cracked at 1200° C. for 1 hour under an argon protective atmosphere;

[0041] (3) Preform the powder after pyrolysis in step 2 into the shape of a nuclear fuel cladding tube, and then undergo spark plasma sintering at 1600°C for 10 minutes to obtain Al 4 SiC 4 / SiC composite nuclear fuel cladding tube.

[0042] Al prepared above 4 SiC ...

Embodiment 3

[0044] In this embodiment, the nuclear fuel cladding tube is silicon carbide fiber (SiC f ) and AlSiC ceramic material (Al 4 SiC 4 ) composite material Al 4 SiC 4 / SiC f Composition, its preparation steps are as follows:

[0045] (1) Mix liquid hyperbranched polycarbosilane (LHBPCS) with an appropriate amount of aluminum powder, disperse ultrasonically, and ball mill to make a slurry;

[0046] (2) According to the structure of the nuclear fuel cladding tube, the SiC f Pre-weaving into a tubular preform, impregnating the tubular preform with the slurry prepared in step 1 for 12 hours, while applying a pressure of 5 MPa;

[0047] (3) The impregnated SiC f Tubular preforms were pyrolyzed for 2 hours at 1600°C under an argon protective atmosphere;

[0048] (4) Repeat step (3) 5-10 times to obtain highly dense Al 4 SiC 4 / SiC f Constituted nuclear fuel cladding tube.

[0049] Al prepared above 4 SiC 4 / SiC f The phase composition and figure 1 similar, mainly by Al ...

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Abstract

The present invention provides a nuclear fuel cladding pipe, which is made of an aluminum silicon carbon ceramic material or an aluminum silicon carbon ceramic matrix composite material, or the surface coating of the nuclear fuel cladding pipe is made of the aluminum silicon carbon ceramic material or aluminum silicon carbon ceramic matrix composite material, wherein the general structure formulaof the aluminum silicon carbon ceramic material is (Al4C3)n(SiC)m, wherein, n denotes the layer number of Al4C3 in an aluminum silicon carbon unit cell and is a natural number; m denotes the layer number of SiC in the aluminum silicon carbon unit cell and is a natural number. The nuclear fuel cladding pipe can meet the requirements of structural elements in the fourth generation fission reactor nuclear power system on high temperature resistance, corrosion resistance, oxidation resistance, neutron radiation resistance and good neutron radiation stability, and has a good application prospect.

Description

technical field [0001] The invention relates to the field of nuclear energy key structural materials, in particular to a nuclear fuel cladding tube and a preparation method thereof. Background technique [0002] Nuclear energy is an efficient, economical, and clean energy. After nearly 70 years of development, the research on fourth-generation nuclear reactors has gradually deepened. In order to improve the energy conversion efficiency, the core temperature in the nuclear reactor will reach above 1000°C. [0003] The nuclear fuel cladding tube is one of the most harsh and important components in the core structure. It not only directly contacts with the nuclear fuel, but also needs to have good high temperature resistance and radiation resistance. Critical water, molten fluorine salt, lead-bismuth coolant, etc., are in direct contact, requiring excellent corrosion resistance. Therefore, nuclear fuel cladding tube materials need high temperature resistance, corrosion resist...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/565C04B35/80C04B35/81G21C3/07
CPCC04B35/56C04B35/565G21C3/07C04B2235/3826C04B2235/3217C04B2235/5244C04B2235/5276Y02E30/30
Inventor 黄庆邵俊琦袁钦王霁周小兵何流都时禹黄峰黄政仁
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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