On the chemical compatibility between Zr-4 substrate and well-bonded Cr2AlC coating

doi:10.1016/j.jmst.2018.09.005

J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (1): 1-5.DOI: 10.1016/j.jmst.2018.09.005

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On the chemical compatibility between Zr-4 substrate and well-bonded Cr₂AlC coating

Jie Zhang^a^*, Zhilin Tian^a, Haibin Zhang^b, Lei Zhang^c, Jingyang Wang^a()

^aHigh-Performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^bInstitute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
^cTechnical Support Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2018-04-25 Revised:2018-05-28 Accepted:2018-06-04 Online:2019-01-04 Published:2019-01-15
Contact: JieZhang

Abstract

Abstract:

Accident tolerant fuel (ATF) for the light water reactor has gained wide attentions after the Fukushima accident. To enhance the accident-tolerance of the nuclear system, one strategy is to modify the Zr-based alloy cladding surface with advanced ceramic coating. In this work, monolithic and dense Cr₂AlC coating has been synthesized by magnetron sputtering. The as-grown Cr₂AlC coating exhibits good chemical compatibility with Zr-based alloy substrate as well as mechanical integrity under both pull-off and scratch tests. The coating system also presents moderate thermochemical compatibility at 800?°C but degrades above 1000?°C under simulated loss-of-coolant accident (LOCA) conditions.

Key words: Accident tolerant fuel, Cr₂AlC coating, Thermochemical compatibility

Jie Zhang, Zhilin Tian, Haibin Zhang, Lei Zhang, Jingyang Wang. On the chemical compatibility between Zr-4 substrate and well-bonded Cr₂AlC coating[J]. J. Mater. Sci. Technol., 2019, 35(1): 1-5.

Figures/Tables 5

Fig. 1. XRD pattern of as-deposited Cr2AlC coating.

Fig. 2. Friction coefficient (COF) vs. scratch time of as-deposited coating during scratch test (a), SEM micrographs of conformal cracks of coating (b), initial site of the transit scratch (c) and well-established transit scratch at maximum load (d).

Fig. 3. (a) Cross-sectional TEM micrograph of as-deposited Cr2AlC film, (b) concentration-depth profile of as-synthesis Cr2AlC coating, (c) Cr 2p and (d) Zr 3d XPS spectra for sample after etching for different time.

Fig. 4. CsAl+ cluster ToF-SIMS 3D mapping images of as-deposited (a) and post-annealed (b) coatings with highlighting CsAl+ concentration at interface.

Fig. 5. ToF-SIMS of Zr+, Cr+, Al+ and C+ in as-deposited coating (a), after post-annealed at 800?°C (b) and 1000?°C (c).

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On the chemical compatibility between Zr-4 substrate and well-bonded Cr₂AlC coating

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