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A kind of preparation method of nuclear fuel silicon carbide ceramic cladding tube

A technology for nuclear fuel silicon carbide and silicon carbide ceramics, which is applied in nuclear engineering, reactors, shielding, etc., can solve the problems of inconsistent pipe wall thickness, difficult and uniform deposition on the inner wall of pipe fittings, etc., and achieve the effect of improving reliability.

Active Publication Date: 2019-06-21
核工业第八研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When preparing a long ceramic cladding tube, due to the long length and small diameter of the tube, it is difficult to deposit uniformly on the inner wall of the tube, such as figure 2 As shown, resulting in inconsistent wall thickness

Method used

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  • A kind of preparation method of nuclear fuel silicon carbide ceramic cladding tube
  • A kind of preparation method of nuclear fuel silicon carbide ceramic cladding tube
  • A kind of preparation method of nuclear fuel silicon carbide ceramic cladding tube

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Embodiment 1

[0025] (1) Making winding or braiding parts: winding or braiding silicon carbide fibers on short-sized mandrels, and depositing pyrolytic carbon coatings, but not limited to fiber surface treatments such as pyrolytic carbon coatings. In the embodiment, the size of the mandrel can be but not limited to Φ8×1000 mm mandrel, and the thickness of the winding or weaving can be but not limited to 0.5 mm. In the embodiment, the thickness of the pyrolytic carbon coating can be but not limited to 0.5 micron.

[0026] (2) Pressurized impregnation and cross-linking: Put the above-mentioned winding or braided parts into a closed mold cavity, use VRTM process vacuum-assisted injection to impregnate liquid polycarbosilane, and keep the injection pressure and heat up to the cross-linking temperature for cross-linking and curing. In the embodiment, the mold cavity size can be but not limited to Φ9×1000mm, the liquid polycarbosilane can be but not limited to 1:1 xylene dissolved solid silane so...

Embodiment 2

[0031] A method for preparing a nuclear fuel silicon carbide ceramic cladding tube, characterized in that the method adopts the following steps:

[0032] (1) Manufacture of composite material intermediate layer pipe fittings: use pressure impregnation crosslinking to prepare silicon carbide fiber ceramic composite layer pipe fittings on the mold core, put the winding or braided parts into a closed mold cavity, and use VRTM process vacuum assisted injection impregnation Liquid polycarbosilane, keep the injection pressure and heat up to the crosslinking temperature for crosslinking and curing. The cavity size can be but not limited to Φ9×400mm. The liquid polycarbosilane is LPVCS, and xylene can be used to dissolve the solid silane solution at 1:1, and inject The pressure is 0.02Mpa, the cross-linking and curing temperature is 250°C, and then the densification treatment is carried out. The pipe fittings with mold cores are cracked at 1100°C under the protection of nitrogen. After...

Embodiment 3

[0036] A method for preparing a nuclear fuel silicon carbide ceramic cladding tube, characterized in that the method adopts the following steps:

[0037] (1) Manufacture of composite material intermediate layer pipe fittings: use pressure impregnation crosslinking to prepare silicon carbide fiber ceramic composite layer pipe fittings on the mold core, put the winding or braided parts into a closed mold cavity, and use VRTM process vacuum assisted injection impregnation Liquid polycarbosilane, keep the injection pressure and heat up to the crosslinking temperature for crosslinking and curing. The cavity size is Φ9×400mm. The liquid polycarbosilane is LPVCS. You can also use xylene to dissolve the solid silane solution at a ratio of 1:1. The injection pressure is 0.1Mpa. , The crosslinking curing temperature is 180°C. Then carry out densification treatment. Under the protection of nitrogen, the pipe fittings with mold cores are cracked at 1200°C. After cracking, the PIP method i...

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Abstract

The invention relates to a preparation method for a nuclear fuel silicon carbide ceramic cladding tube. The method for manufacturing a nuclear fuel silicon carbide ceramic cladding tube comprises the steps of manufacture of a composite material middle layer tube member, deposition of an inner integral layer and an outer protection layer, and welding of a plurality of sections of short silicon carbide ceramic tubes. Compared with the prior art, the method has the advantages of good size uniformity, high mechanical strength, good straightness and high preparation efficiency.

Description

technical field [0001] The invention relates to the application field of accident-resistant nuclear fuel, in particular to a method for preparing a nuclear fuel silicon carbide ceramic cladding tube. Background technique [0002] Compared with the traditional zirconium alloy nuclear fuel cladding, the silicon carbide ceramic cladding tube can maintain good strength and good radiation resistance at high temperatures. [0003] A lot of research has been done on the preparation of silicon carbide cladding tubes at home and abroad. As described in patent CN 101019193A and patent CN103818056B, the inner overall layer is made first, and then the inner overall layer is covered with a silicon carbide fiber composite material layer, impregnated with poly Densification is performed directly after carbosilane. The densification process produces closed pores due to fiber lapping between the inner overall layer and the composite material layer (especially the weaving process), such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F1/06G21F1/12G21F3/00C04B35/565C04B35/622
CPCC04B35/565C04B35/622G21F1/06G21F1/12G21F3/00
Inventor 谢宇辉高建军沈伟
Owner 核工业第八研究所
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