INVESTIGATION OF CERAMICS FOR HIGH TEMPERATURE TURBINE VANES
Hot-pressing of a 99.7% pure commercial silicon carbide powder with one percent boron addition has yielded a 99+% dense ceramic with 30 microns tabular grains and 50,000 psi flexural strength. A submicron particle size powder consolidated with 1% boron addition at 1950C gives 108,000 psi strength at room temperature and 64,000 psi at 1500C. Its microstructure is composed of 3.0 microns equiaxed SiC grains and less than 0.5% of free silicon forming isolated grains at the lower temperature and a grain boundary phase and intragranular inclusions at 2100C. No boron containing phase could be detected. The structure is formed by a mixture of various hexagonal poly types with the alpha-6H form prevailing.
General Electric Corporate Research & DevelopmentSchenectady, NY USA
- Prochazka, S
- Publication Date: 1972-3
- Pagination: 69 p.
- TRT Terms: Blades (Machinery); Ceramic coatings; Ceramic materials; Failure; Turbines
- Old TRIS Terms: Turbine blade failure
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- Accession Number: 00035610
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: SRD-72-035 Final Rpt
- Contract Numbers: N00019-71-C-0290
- Files: TRIS
- Created Date: Oct 27 1973 12:00AM