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Effect of layer-graded bond coats on edge stress concentration and oxidation behavior of thermal barrier coatings
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Zhu, Dongming Ghosn, Louis J. Miller, Robert A. |
| Copyright Year | 1998 |
| Description | Thermal barrier coating (TBC) durability is closely related to design, processing and microstructure of the coating Z, tn systems. Two important issues that must be considered during the design of a thermal barrier coating are thermal expansion and modulus mismatch between the substrate and the ceramic layer, and substrate oxidation. In many cases, both of these issues may be best addressed through the selection of an appropriate bond coat system. In this study, a low thermal expansion and layer-graded bond coat system, that consists of plasma-sprayed FeCoNiCrAl and FeCrAlY coatings, and a high velocity oxyfuel (HVOF) sprayed FeCrAlY coating, is developed to minimize the thermal stresses and provide oxidation resistance. The thermal expansion and oxidation behavior of the coating system are also characterized, and the strain isolation effect of the bond coat system is analyzed using the finite element method (FEM). Experiments and finite element results show that the layer-graded bond coat system possesses lower interfacial stresses. better strain isolation and excellent oxidation resistance. thus significantly improving the coating performance and durability. |
| File Size | 1532029 |
| Page Count | 26 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990008953 |
| Archival Resource Key | ark:/13960/t9n34sk4s |
| Language | English |
| Publisher Date | 1998-11-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Sprayed Coatings Stress Concentration Joints Junctions Plasmas Physics Durability Ceramics Substrates Finite Element Method Thermal Expansion Oxidation Resistance Thermal Control Coatings Oxidation Coating Microstructure Flame Spraying Thermal Stresses Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
