Zr alloy protection against high-temperature oxidation: Coating by a double-layered structure with active and passive functional properties

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F19%3AN0000052" target="_blank" >RIV/26722445:_____/19:N0000052 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0010938X19316646" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0010938X19316646</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.corsci.2019.108270" target="_blank" >10.1016/j.corsci.2019.108270</a>

Result language

angličtina

Original language name

Zr alloy protection against high-temperature oxidation: Coating by a double-layered structure with active and passive functional properties

Original language description

In this work, a new concept of metal surface protection against degradation caused by high-temperature oxidation in water environment is presented. We were the first to create a double-layered coating consisting of an active and passive part to protect Zr alloy surface against high-temperature oxidation in a hot water environment. We investigated the hot steam corrosion of ZIRLO fuel cladding coated with a double layer consisting of 500 run nanocrystalline diamond (NCD) as the bottom layer and 2 gm chromium-aluminum-silicon nitride (CrAlSiN) as the upper layer. Coated and uncoated ZIRLO samples were exposed for 4 days at 400 degrees C in an autoclave and for 60 min at 1000 degrees C (nuclear reactor accident temperature) in a hot steam furnace. We have shown that the NCD coating protects the Zr alloy surface against oxidation in an active way: carbon from NCD layer enters the Zr alloy surface and, by changing the physical and chemical properties of the Zr cladding tube surface, limits the Zr oxidation process. In contrast, the passive CrAlSiN coating prevents the Zr cladding tube surface from coming into physical contact with the hot steam. The advantages of the double layer were demonstrated, particularly in terms of hot (accident-temperature) oxidation kinetics: in the initial stage, CrAlSiN layer with low number of defects acts as an impermeable barrier. But after a longer time (more than 20 min) the protection by more cracked CrAlSiN decreases. At the same time, the carbon from NCD strongly penetrates the Zr cladding surface and worsen conditions for Zr oxidation. For the double-layer coating, the underlying NCD layer mitigates thermal expansion, reducing cracks and defects in upper layer CrAlSiN.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Corrosion Science

ISSN

0010-938X

e-ISSN

1879-0496

Volume of the periodical

163

Issue of the periodical within the volume

February

Country of publishing house

GB - UNITED KINGDOM

Number of pages

22

Pages from-to

1-22

UT code for WoS article

000513295700038

EID of the result in the Scopus database

2-s2.0-85076047855