Thermal barrier coating life-prediction model development. Annual report no. 2

Technical Report · Wed Oct 01 04:00:00 EDT 1986

OSTI ID:6687672

Strangman, T E; Neumann, J; Liu, A

The program focuses on predicting the lives of two types of strain-tolerant and oxidation-resistant thermal barrier coating (TBC) systems that are produced by commercial coating suppliers to the gas turbine industry. The plasma-sprayed TBC system, composed of a low-pressure plasma-spray (LPPS) or an argon shrouded plasma-spray (ASPS) applied oxidation resistant NiCrAlY or (CoNiCrAlY) bond coating and an air-plasma-sprayed yttria partially stabilized zirconia insulative layer, is applied by both Chromalloy, Klock, and Union Carbide. The second type of TBS is applied by the electron beam-physical vapor deposition (EB-PVD) process by Temescal. The second year of the program was focused on specimen procurement, TMC system characterization, nondestructive evaluation methods, life prediction model development, and TFE731 engine testing of thermal barrier coated blades. Materials testing is approaching completion. Thermomechanical characterization of the TBC systems, with toughness, and spalling strain tests, was completed. Thermochemical testing is approximately two-thirds complete. Preliminary materials life models for the bond coating oxidation and zirconia sintering failure modes were developed. Integration of these life models with airfoil component analysis methods is in progress. Testing of high pressure turbine blades coated with the program TBS systems is in progress in a TFE731 turbofan engine. Eddy current technology feasibility was established with respect to nondestructively measuring zirconia layer thickness of a TBC system.

• Research Organization: Garrett Turbine Engine Co., Phoenix, AZ (USA)
• OSTI ID: 6687672
• Report Number(s): N-88-28142; NASA-CR-179507; GTEC-21-5988; NAS-1.26:179507
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
AIRFOILS
COATINGS
DOCUMENT TYPES
ENERGY BEAM DEPOSITION FILMS
ENGINES
FAILURE MODE ANALYSIS
FILMS
GAS TURBINE ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MATHEMATICAL MODELS
PERFORMANCE TESTING
PROGRESS REPORT
PROTECTIVE COATINGS
SERVICE LIFE
SPRAYED COATINGS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TESTING
TURBINE BLADES
VAPOR DEPOSITED COATINGS