Loading...
Please wait, while we are loading the content...
Similar Documents
Preliminary study of cyclic thermal shock resistance of plasma-sprayed zirconium oxide turbine outer air seal shrouds
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Wisander, D. W. Bill, R. C. |
| Copyright Year | 1977 |
| Description | Several experimental concepts representing potential high pressure turbine seal material systems were subjected to cyclic thermal shock exposures similar to those that might be encountered under severe engine start-up and shut-down sequences. All of the experimental concepts consisted of plasma-sprayed yttria stabilized ZrO2 on the high temperature side of the blade tip seal shroud. Between the ZrO2 and a cooled, dense metal backing, various intermediate layer concepts intended to mitigate thermal stresses were incorporated. Performance was judged on the basis of the number of thermal shock cycles required to cause loss of seal material through spallation. The most effective approach was to include a low modulus, sintered metal pad between the ZrO2 and the metallic backing. It was also found that reducing the density of the ZrO2 layer significantly improved the performance of specimens with plasma-sprayed metal/ceramic composite intermediate layers. |
| File Size | 3680521 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780007337 |
| Archival Resource Key | ark:/13960/t1sf7k29m |
| Language | English |
| Publisher Date | 1977-12-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Sprayed Coatings Seals Stoppers Zirconium Oxides Shrouds Thermal Shock Shock Resistance Yttria-stabilized Zirconia Gas Turbine Engines Spallation Ceramics Plasma Spraying 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 |
