Thermal barrier coating life prediction model. Annual report

Technical Report · Tue Apr 01 04:00:00 EST 1986

OSTI ID:6872198

Hillery, R V; Pilsner, B H; Cook, T S; Kim, K S

This is the second annual report of the first 3-year phase of a 2-phase, 5-year program. The objectives of the first phase are to determine the predominant modes of degradation of a plasma sprayed thermal barrier coating system and to develop and verify life prediction models accounting for these degradation modes. The primary TBC system consists of an air plasma sprayed ZnO/sub 2/-Y/sub 2/O/sub 3/ top coat, a low pressure plasma sprayed NiCrAlY bond coat, and a Rene' 80 substrate. Task I was to evaluate TBC failure mechanisms. Both bond coat oxidation and bond coat creep have been identified as contributors to TBC failure. Key property determinations have also been made for the bond coat and the top coat, including tensile strength, Poisson's ratio, dynamic modulus, and coefficient of thermal expansion. Task II is to develop TBC life prediction models for the predominant failure modes. These models will be developed based on the results of thermmechanical experiments and finite element analysis. The thermomechanical experiments have been defined and testing initiated. Finite element models have also been developed to handle TBCs and are being utilized to evaluate different TBC failure regimes.

• Research Organization: General Electric Co., Cincinnati, OH (USA)
• OSTI ID: 6872198
• Report Number(s): N-87-13539; NASA-CR-179504; NAS-1.26:179504; R-86AEB511; AR-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
BONDING
CHALCOGENIDES
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
COATINGS
DATA
EXPANSION
EXPERIMENTAL DATA
FABRICATION
INFORMATION
JOINING
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POISSON RATIO
PROTECTIVE COATINGS
SERVICE LIFE
SPRAYED COATINGS
THERMAL DEGRADATION
THERMAL EXPANSION
THERMAL INSULATION
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES