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Research Papers

Structure and Thermal Conductivity of Nanostructured Hafnia-Based Thermal Barrier Coating Grown on SS-403

[+] Author and Article Information
M. Noor-A-Alam

e-mail: mnooraalam@miners.utep.edu

A. R. Choudhuri

e-mail: ahsan@utep.edu

C. V. Ramana

e-mail: rvchintalapalle@utep.edu
Department of Mechanical Engineering,
University of Texas at El Paso,
El Paso, TX 79968

1Corresponding author.

Manuscript received April 20, 2012; final manuscript received March 5, 2013; published online June 27, 2013. Assoc. Editor: Debjyoti Banerjee.

J. Nanotechnol. Eng. Med 4(1), 011007 (Jun 27, 2013) (5 pages) Paper No: NANO-12-1069; doi: 10.1115/1.4024046 History: Received April 20, 2012; Revised March 05, 2013

Yttria-stabilized hafnia (YSH) coatings were grown onto stainless steel 403 (SS-403) and Si substrates. The deposition was made at various growth temperatures ranging from room temperature (RT) to 500 °C. The microstructure and thermal properties of the YSH coatings were evaluated employing grazing incidence X-ray diffraction (GIXRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), and photoacoustic measurements. GIXRD studies indicate that the coatings crystalize in cubic structure with a (111) texturing. Well-grown triangular dense morphology was evident in SEM data. EDS analysis indicates the composition stability of YSH coatings. The grain size increases with the increasing growth temperature. Thermal conductivity measurements indicate lower thermal conductivity of YSH coatings compared to either pure hafnia or yttria-stabilized zirconia.

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Figures

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Fig. 1

XRD patterns of YSH coatings on SS-403 substrates

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Fig. 2

SEM images of YSH coatings grown on SS-403 substrates

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Fig. 3

SEM image of the Si-YSH interface grown at 500 °C

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Fig. 4

Grain size of YSH on SS-403 as a function of growth temperature

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Fig. 5

EDS spectrum of YSH coatings grown at 500 °C showing the composition in the coating (top panel). The EDS spectrum of the bare SS-403 substrate is also shown for comparison (bottom panel).

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Fig. 6

Phase shift with respect to modulation frequency for YSH on SS-403 grown at RT (a), 300 °C (b), and 500 °C (c)

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Fig. 7

Variation of thermal conductivity of YSH on SS-403 with growth temperature

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