Advanced Neutron and X-Ray Techniques for Insights Into the Microstructure of EB-PVD Thermal Barrier Coatings

Published

October 12, 2021

Author(s)

A Kulkarni, A N. Goland, H Herman, Andrew J. Allen, T A. Dobbins, F DeCarlo, J Ilavsky, S Fang, P Lawton

Abstract

The ongoing quest to increase gas turbine efficiency and performance (increased thrust) provides a driving force for materials development. While improved engine and usage of novel materials provide solutions for increased engine operating temperatures, and hence fuel efficiency reliability issues remain. Thermal barrier coatings (TBCs), deposited onto turbine components using the electron-beam physical vapor deposition (EB-PVD) process, exhibit unique pore architectures capable of bridging the technological gap between insulation/life extension and prime reliance. This article explores the potential of advanced x-ray and neutron techniques for comprehension of an EB-PVD TBC coating microstructure. While conventional microscopy reveals a hierarchy of voids, complementary advanced techniques allow quantification of these voids in terms of component porosities, anisotropy, size and gradient through the coating thickness. In addition, the derived microstructural parameters obtained both further knowledge of the nature and architecture of the porosity, and help establish its influence on the resultant thermal and mechanical properties.

Citation

Acta Materialia

Pub Type

Journals

Keywords

EB-PVD, microstructure characterization, porosity-property correlations, small-angle neutron scattering, thermal barrier coatings, ultrasmall-angle x-ray scattering, x-ray microtomography, yttria stabilized zirconia

Citation

Kulkarni, A. , Goland, A. , Herman, H. , Allen, A. , Dobbins, T. , DeCarlo, F. , Ilavsky, J. , Fang, S. and Lawton, P. (2021), Advanced Neutron and X-Ray Techniques for Insights Into the Microstructure of EB-PVD Thermal Barrier Coatings, Acta Materialia (Accessed October 11, 2024)