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RESEARCH PAPERS

Thermal Barrier Coatings on Turbine Blades by Plasma Spraying With Improved Cooling

[+] Author and Article Information
T. Cosack

MTU Motoren- und Turbinen-Union, Dachauerstr. 665D-8000, Munchen 50, Federal Republic of Germany

L. Pawlowski, S. Sturlese

CSM Centro Sviluppo Materiali, I-38057 Pergine di Valsugana (TN), Italy

S. Schneiderbanger

MTU Motoren- und Turbinen-Union, Munchen 50, Federal Republic of Germany

J. Eng. Gas Turbines Power 116(1), 272-276 (Jan 01, 1994) (5 pages) doi:10.1115/1.2906805 History: Received February 24, 1992; Online April 24, 2008

Abstract

Turbine blades were coated with a thermal barrier coating system consisting of an MCrAlY bond coat about 100 μm thick deposited by Low-Pressure Plasma Spraying (LPPS) and a 300 μm thick ZrO2 -7 wt. % Y2 O3 top coat. The latter was manufactured by both Atmosphere and Temperature Controlled Spraying (ATCS) and Air Plasma Spraying (APS) using internal air cooling through the cooling holes of the turbine blades. Coated blades were submitted to thermal cycling tests in a burner rig with hot gas temperature of 1485°C. In the case of ATCS coated blades the number of cycles until the first spallation at the leading edge of the blade was between 350 and 2400. The number of cycles of the thermal barrier coatings sprayed with internal cooling was between 1200 and 1800. Furnace cycling tests were also carried out with ATCS coated blades at temperatures of 1100 and 1200°C. The results of thermal cycle tests and the investigations of the microstructure are discussed.

Copyright © 1994 by The American Society of Mechanical Engineers
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