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Analyzing Porosity in Thermal Barrier Coatings: Edge Detection of Images Using MATLAB

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Collection

2014 ASEE Annual Conference & Exposition

Location

Indianapolis, Indiana

Publication Date

June 15, 2014

Start Date

June 15, 2014

End Date

June 18, 2014

ISSN

2153-5965

Conference Session

Use of Technology for Education

Tagged Division

Manufacturing

Page Count

12

Page Numbers

24.185.1 - 24.185.12

Permanent URL

https://peer.asee.org/20076

Download Count

107

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Paper Authors

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Derrick Robinson Virginia State University

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Pallant Ramsundar Virginia State University

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Dr. Pallant Ramsundar is a Research Professor at the Virginia State University based at the the Commonwealth Center for Advanced Manufacturing (CCAM) in Virginia. Dr. Ramsundar holds a doctorate from the University of Cambridge in Rapid Manufacturing and has extensive industrial experience in manufacturing. Dr. Ramsundar's research interests are in additive manufacture, Nano and micro manufacturing, CAD/CAM and Product Design and Development.

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Chandan B Samantaray Virginia State University

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Dr. Chandan B. Samantaray, has been working as Assistant Professor of Physics in the Department of Chemistry & Physics, Virginia State University. He has almost fifteen years of active research in the fields of ceramic thin films/coating, semiconductor devices & process, and modeling. His interests include advanced manufacturing, nanosensors, and finite element simulation.

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Abstract

Evaluation of various edge detection methods in MATLAB for determining porosity in thermal barrier coatings Derrick Robinson1, and P. Ramsundar2, 4 , C. B. Samantaray3, 4 * 1 Department of Computer Engineering, Virginia State University, Petersburg, VA 2 Departments of Mathematics & Computer Science, Virginia State University, Petersburg, VA 3 Department of Chemistry & Physics, Virginia State University, Petersburg, VA 4 Commonwealth Center for Advanced Manufacturing (CCAM), Disputanta, VAThermal spray has been widely used in aerospace and manufacturing industries with a variety ofapplications, especially for coating technology. Methods such as air plasma spray and electronbeam physical vapor deposition are used for thermal barrier coatings (TBC) applied to turbines,machinery parts and tools. The process-structure-property correlations to the coating technologyare very important for achieving lifetime durability and sustainability [1, 2]. An importantmeasure of coating integrity is the porosity of the surface structure [3]. Traditionally porosity ofthe deposit is obtained by microscopy of surface sections and use of software to assess theporosity based on a manual grayscale setting. As a result porosity results on surface coatings arehighly subjective.This paper evaluates six edge detection methods in MATLAB for determining porositymeasurement on a test image of a thermal barrier coating.References1. S. Sampath, V. Srinivasan, A. Valarezo, A. Vaidya, and T. Streibl, “Sensing, Control, and In Situ Measurement of Coating Properties: An Integrated Approach Toward Establishing Process-Property Correlations”, Journal of Thermal Spray Technology, 18 (2009) p. 243.2. W. Chi and S. Sampath, “Microstructure–Thermal Conductivity Relationships for Plasma-Sprayed Yttria-Stabilized Zirconia Coatings”, J. Am. Ceram. Soc., 91 (2008) p.2636.3. A. Portinhaa, V. Teixeiraa, J. Carneiroa, J. Martinsb, M. F. Costac, R. Vassend, and D. Stoeverd, “Characterization of thermal barrier coatings with a gradient in porosity”, Surface & Coatings Technology, 195 (2005) p. 245.* Corresponding email: csamantaray@vsu.edu

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