Title

Piezospectroscopic Measurements Capturing the Evolution of Plasma Spray-Coating Stresses with Substrate Loads

Authors

Authors

G. Freihofer; D. Fugon-Dessources; E. Ergin; A. Van Newkirk; A. Gupta; S. Seal; A. Schulzgen;S. Raghavan

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

ACS Appl. Mater. Interfaces

Keywords

piezospectroscopy; plasma-spray; coating; stress; mechanical testing; photo-luminescence; COMPOSITE COATINGS; ALUMINA COATINGS; CERAMIC COATINGS; IN-SITU; BEHAVIOR; FLUORESCENCE; OXIDE; MICROSTRUCTURE; COMPRESSION; DEPENDENCE; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary

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 (alpha-Al2O3) within these coatings offer a diagnostic functionality, enabling these properties to be probed experimentally at the microscale, under substrate loading. The piczospectroscopic (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.

Journal Title

Acs Applied Materials & Interfaces

Volume

6

Issue/Number

3

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

1366

Last Page

1369

WOS Identifier

WOS:000331493200006

ISSN

1944-8244

Share

COinS