Accession Number:

AD0884140

Title:

Improved Graphite Materials for Re-Entry Vehicles. Volume 4

Descriptive Note:

Final rept. 1 Jan-31 Oct 1970

Corporate Author:

GENERAL ELECTRIC CO PHILADELPHIA PA RE-ENTRY SYSTEMS DEPT

Personal Author(s):

Report Date:

1971-05-01

Pagination or Media Count:

194.0

Abstract:

Several types of carbon-carbon composites have been developed, in which eitherhigh or low modulus carbon fiber bundles extend continuously in several directionsin three dimensions. Ablation screening tests at 90 atm. stagnation pressure haveshown than 3- irectional reinforced graphites, having a high proportion of fibersin the axial direction can have ablation rates similar to ATJ-S with propermatrix processing. Fine- extured, cubic, 7-directional- reinforced compositeshave shown performance similar to 3-directional samples with similar processing.Comparison ablation data on the 3-Mod. 3 CC composite and IP fibrous graphiteare also included. Preliminary flexure and plate slap screening tests on7-D REINFORCED GRAPHITE INDICATE A POTENTIAL FOR A TOUGH COMPOSITE WITHISOTROPIC PROPERTIES, AND FURTHER DEVELOPMENT OF THIS CONCEPT IS RECOMMENDED FORFUTURE WORK. Preliminary thermal-mechanical properties and plate slap screeningdata have been obtained on CVD INFILTRATED 4-DIRECTIONAL Omniweave reinforcedcarbons, suitable for thermal shields, in which composite fiber bundles arepacked in 4-directions with close-to- ubic symmetry. When high modulus filamentsare used, this material shows high impact resistance and high strain to failure1.5-2.5 elongation at maximum load in tension at room temperature, in additionto high surface hardness requiring diamond grinding and uniform recession insimulated thermal shield ablation tests.

Subject Categories:

  • Laminates and Composite Materials
  • Guided Missile Reentry Vehicles

Distribution Statement:

APPROVED FOR PUBLIC RELEASE