Chapter 58. Gelcast AS800 Materials Characterization for Rocket Engine Applications

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Simin Rachel Khoshbin

Published Online: 28 MAR 2008

DOI: 10.1002/9780470294635.ch58

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

How to Cite

Khoshbin, S. R. (2000) Gelcast AS800 Materials Characterization for Rocket Engine Applications, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294635.ch58

Author Information

  1. The Boeing Company Rocketdyne Propulsion & Power 6633 Canoga Ave. P.O. Box 7922 Canoga Park, CA 91309–7922

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375693

Online ISBN: 9780470294635

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Keywords:

  • gelcast silicon nitride;
  • light weight thrust chamber assembly;
  • virgin material.;
  • rocket propulsion technology;
  • space shuttle main engine

Summary

The material properties for a gelcast silicon nitride (ASSOO) 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°F), ambient and elevated (2000°F).

The characterization of AS800 yielded data consistent with Allied Signal 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 machined 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.