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Research Papers

Performance of Chemical Vapor Deposition and Plasma Spray-Coated Stainless Steel 310 in Supercritical Water

[+] Author and Article Information
Xiao Huang

Mechanical and Aerospace Engineering Department,
Carleton University,
1125 Colonel By Dr., Ottawa, ON K1S 5B6, Canada
e-mail: Xiao.huang@carleton.ca

Q. Yang

National Research Council Canada,
Ottawa, ON K1A 0R6, Canada

Dave Guzonas

Atomic Energy of Canada Limited,
Chalk River, ON K0J 1J0, Canada

1Corresponding author.

Manuscript received March 30, 2015; final manuscript received July 14, 2015; published online February 29, 2016. Assoc. Editor: Thomas Schulenberg.

ASME J of Nuclear Rad Sci 2(2), 021011 (Feb 29, 2016) (8 pages) Paper No: 15-1037; doi: 10.1115/1.4031198 History: Received March 30, 2015; Accepted July 14, 2015

In this study, aluminized and NiCrAlY plasma-sprayed AISI 310 stainless steel samples were tested in supercritical water (SCW) at 500°C. The microstructure after SCW exposure was analyzed using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Weight measurements were taken before and after exposure to provide quantitative comparison of the two coatings on AISI 310 base metal. The results showed that aluminized and bare 310 stainless steel experienced similar weight gain, in the range of 0.020.08  mg/cm2 after 1550 hr. The aluminized sample had a slight weight decrease as exposure progressed. Oxide formation, in the forms of Al2O3 and (Fe,Cr)2O3, was found on the aluminized surface along with surface cracking after 1550 hr testing in SCW. NiCrAlY-coated 310, however, had the most consistent weight increase and oxide formation (mainly Al2O3) on the surface. Based on the results from this study, the aluminized coating has limitations in providing surface protection due to surface cracking and weight loss. The NiCrAlY plasma-sprayed coating with alumina formation on the surface has the potential to provide long-term surface protection to the substrate material in SCW.

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Figures

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Fig. 1

Samples were hung from the alumina arms of a customized 316 stainless steel tree before being placed into the SCW autoclave

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Fig. 2

Weight change as a function of exposure time in SCW

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Fig. 3

Weight change of stand-alone plasma-sprayed NiCrAlY (600 grit finish) in SCW

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Fig. 4

Cross section of aluminized 310

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Fig. 5

(a) SEM image of NiCrAlY-coated 310 sample and (b) EDS line scan results

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Fig. 6

SEM images and EDS analysis results of bare 310 sample after 1555 hr SCW testing at 2000 times (a), 15,000 times (b), and EDS analysis results of areas A (c) and B in (d)

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Fig. 7

XRD spectrum of bare 310 after SCW testing

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Fig. 8

(a) and (b) SEM images of aluminized 310 sample after 1555 hr SCW testing and (c) EDS analysis results

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Fig. 9

XRD spectrum of aluminized 310 after SCW test

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Fig. 10

SEM images of NiCrAlY-coated 310 sample after 1555 hr SCW testing at (a) 500 times, (b) 1200 times, and (c) EDS analysis result

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Fig. 11

XRD spectrum of NiCrAlY-coated 310 after SCW test

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