Next Article in Journal
Highly Uniform Large-Area (100 cm2) Perovskite CH3NH3PbI3 Thin-Films Prepared by Single-Source Thermal Evaporation
Next Article in Special Issue
Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays
Previous Article in Journal
Cavitation Erosion Resistance and Wear Mechanism Model of Flame-Sprayed Al2O3-40%TiO2/NiMoAl Cermet Coatings
Previous Article in Special Issue
Structure and Properties of High-Hardness Silicide Coatings on Cemented Carbides for High Temperature Applications
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessCommentary

Revisiting the Birth of 7YSZ Thermal Barrier Coatings: Stephan Stecura

1
National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135, USA
2
Vantage Partners, LLC, Brook Park, OH 44142, USA
*
Author to whom correspondence should be addressed.
Dr. Stephan Stecura emigrated to the US from Ukraine, worked on high temperature materials at NASA Glenn from about 1966, retired in 1994, and lives in the greater Cleveland area. He was well known for his discerning, enigmatic approach to research and the smile on his face and treasure troves of original data tucked away in notebooks. The authors are fortunate to have witnessed and studied his successes.
Coatings 2018, 8(7), 255; https://doi.org/10.3390/coatings8070255
Received: 6 July 2018 / Revised: 11 July 2018 / Accepted: 20 July 2018 / Published: 22 July 2018
(This article belongs to the Special Issue Thermal Barrier Coatings)
  |  
PDF [566 KB, uploaded 22 July 2018]
  |  

Abstract

Thermal barrier coatings are widely used in all turbine engines, typically using a 7 wt.% Y2O3–ZrO2 formulation. Extensive research and development over many decades have refined the processing and structure of these coatings for increased durability and reliability. New compositions demonstrate some unique advantages and are gaining in application. However, the “7YSZ” (7 wt.% yttria stabilized zirconia) formulation predominates and is still in widespread use. This special composition has been universally found to produce nanoscale precipitates of metastable t’ tetragonal phase, giving rise to a unique toughening mechanism via ferro-elastic switching under stress. This note recalls the original study that identified superior properties of 6–8 wt.% yttria stabilized zirconia (YSZ) plasma sprayed thermal barrier coatings, published in 1978. The impact of this discovery, arguably, continues in some form to this day. At one point, 7YSZ thermal barrier coatings were used in every new aircraft and ground power turbine engine produced worldwide. 7YSZ is a tribute to its inventor, Dr. Stephan Stecura, NASA retiree. View Full-Text
Keywords: thermal barrier coatings; 7YSZ; turbine blades thermal barrier coatings; 7YSZ; turbine blades
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Smialek, J.L.; Miller, R.A. Revisiting the Birth of 7YSZ Thermal Barrier Coatings: Stephan Stecura . Coatings 2018, 8, 255.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Coatings EISSN 2079-6412 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top