Characterization of Ceramic Vane Materials for 10KW Turboalternator.
Abstract
Characterization was done on four vane candidate materials: hot-pressed silicon nitride, sintered silicon nitride, sintered silicon carbide, and siliconized silicon carbide, being considered for use in a small turbine engine. Chemistry, phase content, and room-temperature mechanical strength were in the ranges expected for such materials. Fracture locations and origins were identified whenever possible, and measurements of fracture mirror radii and flaw sizes were done to enable fracture mechanics parameters to be calculated. Oxidation resistance of all materials was excellent at 950 to 1100 C. High temperature (800 to 1200 C) mechanical behavior was characterized via stepped temperature stress rupture and conventional stress rupture testing. A possible instability was found in the sintered silicon nitride at 1000 C. The hot-pressed silicon nitride was subject to static fatigue at temperatures from 800 to 1100 C. The two silicon carbide materials performed adequately over the same temperature range.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1983
- Accession Number
- ADA132505
Entities
People
- Donald R. Messier
- George D. Quinn
- Liselotte J. Schioler
Organizations
- United States Army Research Laboratory