Loading...
Please wait, while we are loading the content...
Similar Documents
Thermal gradient cyclic behavior of a thermal/environmental barrier coating system on sic/sic ceramic matrix composites
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Zhu, Dongming Lee, Kang N. Miller, Robert A. |
| Copyright Year | 2002 |
| Description | Thermal barrier and environmental barrier coatings (TBCs and EBCs) will play a crucial role in future advanced gas turbine engines because of their ability to significantly extend the temperature capability of the ceramic matrix composite (CMC) engine components in harsh combustion environments. In order to develop high performance, robust coating systems for effective thermal and environmental protection of the engine components, appropriate test approaches for evaluating the critical coating properties must be established. In this paper, a laser high-heat-flux, thermal gradient approach for testing the coatings will be described. Thermal cyclic behavior of plasma-sprayed coating systems, consisting of ZrO2-8wt%Y2O3 thermal barrier and NASA Enabling Propulsion Materials (EPM) Program developed mullite+BSAS/Si type environmental barrier coatings on SiC/SiC ceramic matrix composites, was investigated under thermal gradients using the laser heat-flux rig in conjunction with the furnace thermal cyclic tests in water-vapor environments. The coating sintering and interface damage were assessed by monitoring the real-time thermal conductivity changes during the laser heat-flux tests and by examining the microstructural changes after the tests. The coating failure mechanisms are discussed based on the cyclic test results and are correlated to the sintering, creep, and thermal stress behavior under simulated engine temperature and heat flux conditions. |
| File Size | 1160470 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020066444 |
| Archival Resource Key | ark:/13960/t6q00571n |
| Language | English |
| Publisher Date | 2002-05-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Sprayed Coatings Ceramic Matrix Composites Plasmas Physics Temperature Gradients Gas Turbine Engines Water Vapor Engine Parts Heat Flux Thermal Control Coatings Lasers Temperature Effects Sintering 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 |
