Microstructural Analysis and Transport Properties of Thermally Sprayed Multiple-Layer Ceramic Coatings

Wang, Hsin; Muralidharan, Govindarajan; Leonard, Donovan N.; Haynes, J. Allen; Porter, Wallace D.; England, Roger D.; Hays, Michael; Dwivedi, Gopal; Sampath, Sanjay

doi:10.1007/s11666-017-0680-0

Title: Microstructural Analysis and Transport Properties of Thermally Sprayed Multiple-Layer Ceramic Coatings

Journal Article · Thu Jan 04 00:00:00 EST 2018 · Journal of Thermal Spray Technology

DOI:https://doi.org/10.1007/s11666-017-0680-0· OSTI ID:1423044

Wang, Hsin ^[1]; Muralidharan, Govindarajan ^[1]; Leonard, Donovan N. ^[1]; Haynes, J. Allen ^[1]; Porter, Wallace D. ^[1]; England, Roger D. ^[2]; Hays, Michael ^[2]; Dwivedi, Gopal ^[3]; Sampath, Sanjay ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Cummins Inc., Columbus, IN (United States)
Stony Brook Univ., NY (United States)

In this paper, multilayer, graded ceramic/metal coatings were prepared by an air plasma spray method on Ti-6Al-4V, 4140 steel and graphite substrates. The coatings were designed to provide thermal barriers for diesel engine pistons to operate at higher temperatures with improved thermal efficiency and cleaner emissions. A systematic, progressive variation in the mixture of yttria-stabilized zirconia and bondcoat alloys (NiCoCrAlYHfSi) was designed to provide better thermal expansion match with the substrate and to improve thermal shock resistance and cycle life. Heat transfer through the layers was evaluated by a flash diffusivity technique based on a model of one-dimensional heat flow. The aging effect of the as-sprayed coatings was captured during diffusivity measurements, which included one heating and cooling cycle. The hysteresis of thermal diffusivity due to aging was not observed after 100-h annealing at 800 °C. The measurements of coatings on substrate and freestanding coatings allowed the influence of interface resistance to be evaluated. Finally, the microstructure of the multilayer coating was examined using scanning electron microscope and electron probe microanalysis.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Cummins Inc., Columbus, IN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1423044

Journal Information:: Journal of Thermal Spray Technology, Vol. 27, Issue 3; ISSN 1059-9630

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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References (12)

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Self-Enhancing Thermal Insulation Performance of Bimodal-Structured Thermal Barrier Coating Zhang, Wei-Wei; Li, Guang-Rong; Zhang, Qiang Journal of Thermal Spray Technology, Vol. 27, Issue 7 https://doi.org/10.1007/s11666-018-0754-7	journal	September 2018

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