Loading...
Please wait, while we are loading the content...
Similar Documents
Development of a plasma sprayed ceramic gas path seal for high pressure turbine application
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Shiembob, L. T. |
| Copyright Year | 1978 |
| Description | Development of the plasma sprayed graded, layered ZRO2/CoCrAlY seal system for gas turbine engine blade tip seal applications up to 1589 K (2400 F) surface temperature was continued. The effect of changing ZRO2/CoCrAlY ratios in the intermediate layers on thermal stresses was evaluated analytically with the goal of identifying the materials combinations which would minimize thermal stresses in the seal system. Three methods of inducing compressive residual stresses in the sprayed seal materials to offset tensile thermal stresses were analyzed. The most promising method, thermal prestraining, was selected based upon potential, feasibility and complexity considerations. The plasma spray equipment was modified to heat, control and monitor the substrate temperature during spraying. Specimens were fabricated and experimentally evaluated to: (1) substantiate the capability of the thermal prestrain method to develop compressive residual stresses in the sprayed structure and (2) define the effect of spraying on a heated substate on abradability, erosion and thermal shock characteristics of the seal system. Thermal stress analysis, including residual stresses and material properties variations, was performed and correlated with thermal shock test results. Seal system performance was assessed and recommendations for further development were made. |
| File Size | 11230140 |
| Page Count | 85 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780016198 |
| Archival Resource Key | ark:/13960/t15n1140r |
| Language | English |
| Publisher Date | 1978-05-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Sprayed Coatings Seals Stoppers Gas Turbines Ceramic Coatings Mechanical Properties Thermal Conductivity Ceramics Plasma 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 |
