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

ACS Appl Mater Interfaces

Mechanical and Aerospace Engineering Department, ¶CREOL, The College of Optics and Photonics, §Advanced Materials Processing Analysis Center (AMPAC) and Nanoscience Technology Center, ∥Materials Science and Engineering and College of Medicine , University of Central Florida, Orlando, Florida, United States.

Published: February 2014

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.

Download full-text PDF

Source
http://dx.doi.org/10.1021/am404985kDOI Listing

Publication Analysis

Top Keywords

piezospectroscopic measurements
8
substrate loads
8
aps coatings
8
coatings
6
substrate
5
measurements capturing
4
capturing evolution
4
evolution plasma
4
plasma spray-coating
4
spray-coating stresses
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!