Nickel-chromium (Ni–Cr) coatings deposited by magnetron sputtering for accident tolerant nuclear fuel claddings

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8 Citations (Scopus)

Abstract

Nickel-chromium coatings were deposited on Zr[sbnd]1Nb alloy using magnetron sputtering systems with «hot» Ni and cooled Cr targets. The effect of coating composition on high-temperature oxidation resistance and hydrogen uptake of Zr[sbnd]1Nb was studied. Hydrogen uptake of the alloy was measured in situ under gas-phase hydrogenation at 633 K. High-temperature oxidation was performed in air atmosphere at 1173–1373 K for 20 min. It was shown that the coating with high Ni content (83 at.%) drastically increases hydrogen uptake of the Zr[sbnd]1Nb alloy and demonstrates low oxidation resistance even at 1173 K. The coatings with Cr content ≥45 at.% have low hydrogen permeability which reduces the rate of hydrogen uptake of the alloy. The oxidation resistance of the Ni[sbnd]Cr coatings increases with Cr content in the as-deposited coatings. The pure Cr coating exhibits the best oxidation resistance: only 8 μm-thick oxide layer was observed. There is also found the intensive diffusion of nickel into the alloy during high-temperature oxidation of the samples coated by Ni[sbnd]Cr films with 55 and 17 at.% Ni. The as-deposited Ni[sbnd]Cr coatings are less brittle than the pure Cr coating, but their mechanical properties degrade stronger than for the Cr coating after the oxidation test.

Original languageEnglish
Pages (from-to)69-78
Number of pages10
JournalSurface and Coatings Technology
Volume369
DOIs
Publication statusPublished - 15 Jul 2019

Keywords

  • Chromium
  • High-temperature oxidation
  • Hydrogen uptake
  • Nickel-chromium coatings
  • Nuclear fuel cladding
  • Zirconium alloy

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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