Record Details

Revisiting the Birth of 7YSZ Thermal Barrier Coatings: Steve Stecura
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Author and Affiliation:
Smialek, James L.(NASA Glenn Research Center, Cleveland, OH, United States);
Miller, Robert A.(Vantage Partners, LLC, Cleveland, OH, United States)
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" 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 to 8 wt% 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. It is a tribute to its inventor, Dr. Stephan J. Stecura, NASA retiree.
Publication Date: Mar 01, 2017
Document ID:
20170002299
(Acquired Mar 17, 2017)
Subject Category: NONMETALLIC MATERIALS
Report/Patent Number: NASA/TM-2017-219452, GRC-E-DAA-TN38803, E-19333
Document Type: Technical Report
Contract/Grant/Task Num: NNC12BA01B; WBS 109492.02.03.02.02
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH United States
Organization Source: NASA Glenn Research Center; Cleveland, OH United States
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: THERMAL CONTROL COATINGS; TURBINE ENGINES; RESEARCH AND DEVELOPMENT; METASTABLE STATE; PRECIPITATES; PLASMA LAYERS; MICROSTRUCTURE; REFRACTORY COATINGS; YTTRIA-STABILIZED ZIRCONIA; ZIRCONIUM OXIDES; HEAT RESISTANT ALLOYS; DURABILITY; RELIABILITY; HISTORIES
Other Descriptors: THERMAL BARRIER COATINGS; TURBINE BLADES
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