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Title: Ceramic Coating Inspection Using Laser-Based Ultrasonics and Nanoindentation

Abstract

A combination of laser-based ultrasonic (LBU) inspection and nanoindentation testing is used to evaluate the thickness uniformity and through-thickness mechanical property distributions in 5-20 {mu}m thick CVD environmental barrier coatings. Mullite (3Al2O3{center_dot}2SiO2) coatings grown on silicon carbide substrates are studied in order to provide feedback on the growth process under a range of operating conditions. Nanoindentation tests are performed on polished coating cross sections, and the depth dependence of the elastic modulus of each coating is found. In the LBU experiments, a modulated continuous wave (CW) source is used for surface wave generation. The source is held at a fixed temporal frequency as it is scanned over the surface of the coating. At each temporal frequency of interest, the spatial frequencies of the acoustic modes are found, allowing for phase velocities to be determined. The mean values of elastic moduli found using the LBU approach compare well with the nanoindentation results.

Authors:
;  [1]; ;  [2]
  1. Department of Aerospace and Mechanical Engineering, Boston University, Boston MA 02215 (United States)
  2. Department of Manufacturing Engineering, Boston University, Boston MA 02215 (United States)
Publication Date:
OSTI Identifier:
21054961
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 894; Journal Issue: 1; Conference: Conference on review of progress in quantitative nondestructive evaluation, Portland, OR (United States), 30 Jul - 4 Aug 2006; Other Information: DOI: 10.1063/1.2717976; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; CHEMICAL VAPOR DEPOSITION; COATINGS; COMPARATIVE EVALUATIONS; DISTRIBUTION; ELASTICITY; LASER RADIATION; MULLITE; NANOSTRUCTURES; PHASE VELOCITY; SILICON CARBIDES; SUBSTRATES; SURFACES; ULTRASONIC TESTING; ULTRASONIC WAVES; WAVE PROPAGATION

Citation Formats

Steen, T L, Murray, T W, Basu, S N, and Sarin, V K. Ceramic Coating Inspection Using Laser-Based Ultrasonics and Nanoindentation. United States: N. p., 2007. Web. doi:10.1063/1.2717976.
Steen, T L, Murray, T W, Basu, S N, & Sarin, V K. Ceramic Coating Inspection Using Laser-Based Ultrasonics and Nanoindentation. United States. doi:10.1063/1.2717976.
Steen, T L, Murray, T W, Basu, S N, and Sarin, V K. Wed . "Ceramic Coating Inspection Using Laser-Based Ultrasonics and Nanoindentation". United States. doi:10.1063/1.2717976.
@article{osti_21054961,
title = {Ceramic Coating Inspection Using Laser-Based Ultrasonics and Nanoindentation},
author = {Steen, T L and Murray, T W and Basu, S N and Sarin, V K},
abstractNote = {A combination of laser-based ultrasonic (LBU) inspection and nanoindentation testing is used to evaluate the thickness uniformity and through-thickness mechanical property distributions in 5-20 {mu}m thick CVD environmental barrier coatings. Mullite (3Al2O3{center_dot}2SiO2) coatings grown on silicon carbide substrates are studied in order to provide feedback on the growth process under a range of operating conditions. Nanoindentation tests are performed on polished coating cross sections, and the depth dependence of the elastic modulus of each coating is found. In the LBU experiments, a modulated continuous wave (CW) source is used for surface wave generation. The source is held at a fixed temporal frequency as it is scanned over the surface of the coating. At each temporal frequency of interest, the spatial frequencies of the acoustic modes are found, allowing for phase velocities to be determined. The mean values of elastic moduli found using the LBU approach compare well with the nanoindentation results.},
doi = {10.1063/1.2717976},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 894,
place = {United States},
year = {2007},
month = {3}
}