Thermal barrier coatings on turbine blades by plasma spraying with improved cooling

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Journal of Engineering for Gas Turbines and Power; (United States)

DOI:https://doi.org/10.1115/1.2906805· OSTI ID:7115405

Cosack, T; Schneiderbanger, S ^[1]; Pawlowski, L; Sturlese, S ^[2]

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1. MTU Motoren- und Turbinen-Union, Munchen (Germany)
2. CSM Centro Sviluppo Materiali, Pergine di Valsugana (Italy)

Turbine blades were coated with a thermal barrier coating system consisting of an MCrAlY bond coat about 100 [mu]m thick deposited by Low-Pressure Plasma Spraying (LPPS) and a 300 [mu]m thick ZrO[sub 2]-7 wt.% Y[sub 2]O[sub 3] 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 1,485 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 2,400. The number of cycles of the thermal barrier coatings sprayed with internal cooling was between 1,200 and 1,800. Furnace cycling tests were also carried out with ATCS coated blades at temperatures of 1,100 and 1,200 C. The results of thermal cycle tests and the investigations of the microstructure are discussed.

• OSTI ID: 7115405
• Journal Information: Journal of Engineering for Gas Turbines and Power; (United States), Journal Name: Journal of Engineering for Gas Turbines and Power; (United States) Vol. 116:1; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104* -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CHALCOGENIDES
COATINGS
HEAT RESISTANT MATERIALS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
SPRAYED COATINGS
TRANSITION ELEMENT COMPOUNDS
TURBINE BLADES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES