Gelcast AS800 Materials Characterization for Rocket Engine Applications
Abstract
The material properties for a gelcast silicon nitride (AS800) manufactured by AlliedSignal Ceramic Components of Torrance, California were characterized under the Air Force sponsored Light Weight Thrust Chamber Assembly (LWTCA) Program. The testing results summarized in this paper include tensile, flexural strength, compressive strength, interrupted stress rupture, thermal cycle, fracture toughness, low cycle fatigue, and elastic moduli determinations. In addition, the results for a series of tests determining the effect of simulated rocket engine environment on AS800 are included. Specimens were exposed to hydrogen, water, and oxygen at approximate temperature and pressures of engine operation. After exposure, the retained flexural strength of the specimen was measured and compared to the strength of virgin material. Environmental effects for as-sintered specimens and machined specimen surfaces were measured. The test temperatures included cryogenic (-320 deg F), ambient and elevated (2000 deg F). The characterization of AS800 yielded data consistent with AlliedSignal published data. The environmental exposure data showed that there are some effects on the retained properties of AS800 from exposure to oxygen and water combinations. The effects were statistically significant for as-sintered specimens exposed to oxygen with 10% water. The effects for other environmental conditions were not as severe and more data is needed to quantify the effects.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 12, 2000
- Accession Number
- ADA397984
Entities
People
- Simin R. Khoshbin
Organizations
- Boeing