Piezospectroscopic measurements capturing the evolution of plasma spray-coating stresses with substrate loads

Gregory Freihofer, Daniela Fugon-Dessources, Emrecan Ergin, Amy Van Newkirk, Ankur Gupta, Sudipta Seal, Axel Schülzgen, Seetha Raghavan

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Plasma-spray coatings have a unique microstructure composed of various types of microcracks and weakly bonded interfaces which dictate their nonlinear mechanical properties. The intrinsic photo-luminescence (PL) characteristics of alpha-alumina (α-Al2O3) within these coatings offer a diagnostic functionality, enabling these properties to be probed experimentally at the microscale, under substrate loading. The piezospectroscopic (PS) measurements from the coatings are capable of revealing microstructural stress at high spatial resolution. Here, for the first time, the evolution of stresses within air plasma spray (APS) coatings under increasing substrate loads were captured using piezospectroscopy. With mechanical cycling of the substrate, the PS properties revealed anelastic and inelastic behavior and a relaxation of residual tensile stress within the APS coatings. With decreasing substrate thickness, the coating was observed to sustain more stress, as the substrate's influence on the mechanical behavior decreased. The findings provide an insight into the microstructural response that can serve as the basis for model validation and subsequently drive the design process for these coatings.

Original languageEnglish (US)
Pages (from-to)1366-1369
Number of pages4
JournalACS Applied Materials and Interfaces
Volume6
Issue number3
DOIs
StatePublished - Feb 12 2014

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Loads (forces)
Plasmas
Coatings
Substrates
Aluminum Oxide
Microcracks
Air
Tensile stress
Residual stresses
Photoluminescence
Alumina
Mechanical properties
Microstructure

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Freihofer, Gregory ; Fugon-Dessources, Daniela ; Ergin, Emrecan ; Van Newkirk, Amy ; Gupta, Ankur ; Seal, Sudipta ; Schülzgen, Axel ; Raghavan, Seetha. / Piezospectroscopic measurements capturing the evolution of plasma spray-coating stresses with substrate loads. In: ACS Applied Materials and Interfaces. 2014 ; Vol. 6, No. 3. pp. 1366-1369.
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abstract = "Plasma-spray coatings have a unique microstructure composed of various types of microcracks and weakly bonded interfaces which dictate their nonlinear mechanical properties. The intrinsic photo-luminescence (PL) characteristics of alpha-alumina (α-Al2O3) within these coatings offer a diagnostic functionality, enabling these properties to be probed experimentally at the microscale, under substrate loading. The piezospectroscopic (PS) measurements from the coatings are capable of revealing microstructural stress at high spatial resolution. Here, for the first time, the evolution of stresses within air plasma spray (APS) coatings under increasing substrate loads were captured using piezospectroscopy. With mechanical cycling of the substrate, the PS properties revealed anelastic and inelastic behavior and a relaxation of residual tensile stress within the APS coatings. With decreasing substrate thickness, the coating was observed to sustain more stress, as the substrate's influence on the mechanical behavior decreased. The findings provide an insight into the microstructural response that can serve as the basis for model validation and subsequently drive the design process for these coatings.",
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Freihofer, G, Fugon-Dessources, D, Ergin, E, Van Newkirk, A, Gupta, A, Seal, S, Schülzgen, A & Raghavan, S 2014, 'Piezospectroscopic measurements capturing the evolution of plasma spray-coating stresses with substrate loads', ACS Applied Materials and Interfaces, vol. 6, no. 3, pp. 1366-1369. https://doi.org/10.1021/am404985k

Piezospectroscopic measurements capturing the evolution of plasma spray-coating stresses with substrate loads. / Freihofer, Gregory; Fugon-Dessources, Daniela; Ergin, Emrecan; Van Newkirk, Amy; Gupta, Ankur; Seal, Sudipta; Schülzgen, Axel; Raghavan, Seetha.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 3, 12.02.2014, p. 1366-1369.

Research output: Contribution to journalArticle

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AU - Gupta, Ankur

AU - Seal, Sudipta

AU - Schülzgen, Axel

AU - Raghavan, Seetha

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