Coating for outer surface of zircalloy cladding tube and manufacturing method

A manufacturing method and a technology for cladding tubes, which are applied in the coating process of metal materials, coating, and plating of superimposed layers, etc., can solve the problems of affecting the structural integrity, destroying the integrity of the coating, and reducing the thickness of the coating. , to achieve the effect of avoiding rupture failure, avoiding mutual diffusion of elements, and enhancing bonding force

Pending Publication Date: 2021-08-24
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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Problems solved by technology

However, due to the interdiffusion of elements between the Cr coating and the zirconium alloy substrate under high temperature conditions, the thickness of the coating is reduced, which affects its structural integrity. Secondly, when the temperature is higher than 1330 ° C, the Cr metal and the zirconium alloy substrate undergo a eutectic reaction. damage the integrity of the coating

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  • Coating for outer surface of zircalloy cladding tube and manufacturing method
  • Coating for outer surface of zircalloy cladding tube and manufacturing method

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Embodiment Construction

[0016] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] The first layer coated on the surface of the zirconium alloy shell is a ZrN layer, which is used to isolate the Cr working layer from the Zr matrix; the second layer is a Cr working layer, which resists high temperature water and high temperature steam corrosion.

[0018] A method for manufacturing a coating on the outer surface of a zirconium alloy cladding tube, comprising the following steps,

[0019] First, performing surface pretreatment on the zirconium alloy cladding tube substrate;

[0020] Second, performing surface nitriding on the zirconium alloy cladding tube substrate after surface pretreatment to obtain the ZrN transition layer;

[0021] Thirdly, a Cr working layer is deposited on the surface of the zirconium...

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Abstract

The invention discloses a coating for the outer surface of a zircalloy cladding tube and a manufacturing method. According to the coating, a zircalloy cladding tube base body is sequentially coated with a ZrN transition layer and a Cr working layer; the thickness of the ZrN transition layer is 0.12 micron to 2 microns; and the main component of the Cr working layer is yttrium oxide doped stable zirconium oxide working layer. According to the method, mutual diffusion of elements between the Cr working layer and the zirconium alloy base body can be effectively inhibited, and mutual diffusion of the elements between the Cr working layer and the base body at high temperature is avoided; and under the quenching condition, the ZrN layer generates twin crystals under the stress effect, stress generated due to mismatching of thermal expansion coefficients between the coating and the base body can be effectively released, the binding force of the coating and the base body is enhanced, and cracking and failure of the coating are avoided.

Description

technical field [0001] The invention relates to a zirconium alloy surface coating for a light water reactor to significantly improve the high-temperature steam oxidation resistance of a zirconium alloy cladding tube. Background technique [0002] At present, research is being carried out at home and abroad, trying to obtain a nuclear fuel element (Accident Torlerent Fuel, ATF) that is resistant to LOCA accidents. [0003] In view of the various needs of fuel rods such as wear resistance and high-temperature steam corrosion resistance in LOCA accidents, protective coatings are currently being developed for the zirconium alloy cladding of fuel rods at home and abroad. The coating should make fuel rods both wear-resistant and steam corrosion resistance. Cr coating is recognized as a coating that can simultaneously increase the wear resistance and steam corrosion resistance of fuel rods. However, due to the interdiffusion of elements between the Cr coating and the zirconium al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C8/00G21C3/07
CPCC23C28/322C23C28/34C23C8/00G21C3/07Y02E30/30
Inventor 崔严光李崇卢俊强周云清恽迪马大衍
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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