Multilayer composite coating of zirconium alloy cladding surface, and preparation method thereof

A multi-layer composite and composite coating technology, applied in metal material coating process, coating, ion implantation plating, etc. Good property, high adhesion to film base, and the effect of enhancing bonding force

Active Publication Date: 2020-05-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the conditions of a reactor loss of water accident, the zirconium alloy reacts violently with high-temperature water vapor to generate a large amount of hydrogen and release heat, which may cause a "hydrogen explosion" and cause a major accident in a nuclear power plant, causing a great negative impact on society and the environment

Method used

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  • Multilayer composite coating of zirconium alloy cladding surface, and preparation method thereof
  • Multilayer composite coating of zirconium alloy cladding surface, and preparation method thereof
  • Multilayer composite coating of zirconium alloy cladding surface, and preparation method thereof

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Experimental program
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Effect test

Embodiment

[0041] Utilize multi-arc ion plating technology to deposit metal Cr / CrTiSiN / Cr multilayer composite coating on ZIRLO alloy material surface, the Ar gas that adopts in the embodiment and N 2 The purity of the gas is 99.999vol.%, such as figure 1 As shown, the specific preparation process includes the following steps:

[0042] (1) Surface pretreatment of zirconium alloy materials

[0043] Select the zirconium alloy sample, first use 400#, 800#, 1000#, 2000# and 3000# sandpaper to polish the surface of the workpiece sample, and then polish it with alumina polishing solution with a particle size of 1 μm and silicon dioxide with a particle size of 0.06 μm After polishing, wipe with alcohol and dry to confirm that there are no defects such as cracks, rust, burrs and scratches on the surface of the material. After grinding and polishing, the sample is cleaned. The cleaning solution is a weak alkaline solution prepared by sodium silicate, metal surfactant and industrial deionized wa...

specific Embodiment 1

[0056] The specific process parameters in the step (3) of this embodiment are, the deposition temperature is 400° C., the deposition time is 20 min, the current is 100 A, and the argon gas pressure is 0.3 Pa. The specific process parameters in the step (4) are, the deposition temperature is 400°C, the deposition time is 180min, the current is 100A, the nitrogen gas pressure is 1.5Pa, the specific process parameters in step (5) are, the deposition temperature is 400°C, the deposition time is 20min, the current is 100A, and the argon gas pressure is 0.3Pa , depositing the outer surface of the zirconium alloy substrate to obtain a Cr / CrTiSiN / Cr multilayer composite coating.

[0057] After testing, the atomic fractions of each element in the CrTiSiN working coating are: Cr42.08%, Ti27.06%, Si3.50%, N27.36%, from figure 2It can be seen from the cross-sectional SEM topography that the coating has a compact structure and no holes. The thicknesses of the Cr transition layer, CrTiSiN ...

specific Embodiment 2

[0059] The specific process parameters in step (3) of this embodiment are, the deposition temperature is 390°C, the deposition time is 18min, the current is 92A, and the argon gas pressure is 0.3Pa. The specific process parameters in step (4) are, the deposition temperature is 400°C, the deposition time is 185min, the current is 100A, the nitrogen gas pressure is 1.8Pa, the specific process parameters in step (5) are, the deposition temperature is 390°C, the deposition time is 18min, the current is 92A, and the argon gas pressure is 0.3Pa , depositing the outer surface of the zirconium alloy substrate to obtain a Cr / CrTiSiN / Cr multilayer composite coating.

[0060] After testing, the atomic fractions of each element in the CrTiSiN working coating are: Cr41.73%, Ti27.68%, Si3.47%, N27.12%, the coating structure is dense, no holes appear, and the Cr transition layer in the coating The thicknesses of the CrTiSiN working coating and the Cr protective layer are 0.86 μm, 13.58 μm, a...

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Abstract

The invention discloses a multilayer composite coating of a zirconium alloy cladding surface, and a preparation method thereof. According to the method, a multi-arc ion plating technology is adopted,and zirconium alloy materials are used as a base; high purity nitrogen is used as reaction gas, and high purity argon is used as protective gas; the vacuum degree, arc current, temperature, depositiontime, gas flow and other parameters of a vacuum chamber are regulated; and a three-layer composite coating, using Cr as a transition layer, a CrTiSiN as a working coating and Cr as a protective coating, are formed on the surface of the zirconium alloy materials through deposition. The coating is uniform and compact, and the binding force between the coating and the zirconium alloy base is strong;the cladding integrity is ensured, and generation of hydrogen is inhibited; and hydrogen explosion is avoided. The coating is extremely high in hardness, and the friction resistance of zirconium alloy can be improved effectively; the a cladding pipe is prevented from being failed due to fretting wear, and the safety and accident tolerance of a reactor are improved.

Description

technical field [0001] The invention relates to the field of high temperature protective coatings. Specifically, the invention relates to a high-temperature water vapor oxidation-resistant, high-hardness and friction-resistant multilayer composite coating on the surface of a zirconium alloy cladding and a preparation method thereof, which are applied in the field of nuclear power. Background technique [0002] Zirconium alloy cladding, as the first barrier to the radioactivity of the reactor core, has a series of advantages such as low neutron absorption cross section, high temperature water corrosion resistance, good heat transfer performance, good mechanical properties and radiation resistance, and is called For "the first metal of the atomic age". However, under the conditions of a reactor loss of water accident, the zirconium alloy reacts violently with high-temperature water vapor to generate a large amount of hydrogen and release heat, which may cause a "hydrogen expl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/32C23C14/06C23C14/18C23C14/02
CPCC23C14/325C23C14/0641C23C14/18C23C14/022C23C14/025
Inventor 恽迪刘俊凯马大衍卢俊强崔严光曾奇峰柳文波黄平
Owner XI AN JIAOTONG UNIV
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