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RESEARCH PAPERS: Gas Turbines: Manufacturing, Materials, and Metallurgy

Thermocyclic Behavior of Variously Stabilized EB-PVD Thermal Barrier Coatings

[+] Author and Article Information
U. Schulz, K. Fritscher, M. Peters

DLR, German Aerospace Research Establishment, Institute of Materials Research, D-51170 Cologne, Federal Republic of Germany

J. Eng. Gas Turbines Power 119(4), 917-921 (Oct 01, 1997) (5 pages) doi:10.1115/1.2817074 History: Received February 01, 1996; Online November 19, 2007

Abstract

The demand for increasing gas inlet temperatures in modern gas turbines up to 1500°C and above is the main reason for the need for more reliable thermal barrier coatings. New ceramics should provide higher phase stability and better resistance against chemical attack by pollutants in the combustion gas. Electron-beam physical vapor deposition (EB-PVD) processed, ZrO2 -based TBCs were generated on bond-coated superalloy directionally solidified (DS) samples. Common yttria-stabilized zirconias of two different compositions, as well as novel stabilizers like CeO2 and La2 O3 , were investigated. A columnar structure was established during high-rate deposition in all cases. Diameter, degree of ordering of the columns, and phase composition depended on stabilizer oxide and content. The role of differences of vapor pressures is addressed with regard to chemical homogeneity of the coatings. The performance of the TBCs having various stabilizers was investigated in a cyclic oxidation furnace test and in a burner rig at Mach 0.3. The results were correlated to the type and content of stabilizer with special emphasis on phase analyses. Evaporation of new ceramic compositions necessitates special precautions because the vapor pressures of the components may differ too much. A new dual-source evaporation coater allows the production of these innovative TBCs with close control of chemistry. The potential of the equipment will be discussed.

Copyright © 1997 by The American Society of Mechanical Engineers
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