Development of Fiber Reinforced Ceramic Matrix Composites.
Final rept. Mar 74-Mar 75,
UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CONN
Pagination or Media Count:
Hot-pressed silicon nitride Si3N4 is a leading candidate for use in advanced gas turbine engines. Using an improved matrix material of Si3N4 10 wt Y2O3, Ta reinforced Si3N4 composites have shown excellent thermal fatigue and thermal shock properties in addition to much improved impact resistance when compared to unreinforced Si3N4. Ballistic impact tests at 1300C have shown that the threshold energy below which no damage occurs upon impact for Si3N4-Ta composites is on the order of five times greater than for unreinforced Si3N4. Creep tests at 1300C, 15,000 psi, have shown the Ta reinforced Si3N4 10 Y2O3 sample performing as well, or even better than, the unreinforced sample. In addition, component vane and wedge shapes of dense Si3N4 and Si3N4 reinforced with Ta wires have been formed with minimal finish grinding using the pseudo-isostatic hot-pressing technique.
- Laminates and Composite Materials
- Jet and Gas Turbine Engines