A Study of a Novel Additive for HTPB Propellant
HERCULES INC CUMBERLAND MD ALLEGANY BALLISTICS LAB
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Experimental studies were conducted to define the utility regimes of graphite linters chopped graphite fiber ranging from 50 to 200 micrometers with respect to burn rate augmentation, acoustic stabilization and processing improvement in HTPB composite propellant. Linter utility regimes were defined with respect to burn rate reproducibility where the usable propellant compositional range was shown to increase as overall coarseness of the AP solids distribution increased. T-burner tests showed that linters afforded approximately the same amount of acoustic damping as zirconium carbide at a frequency of 1000 Hz. However, at 3800 Hz, 200 micrometers linters provided damping on the order of 100sec at the 3 level. Processing improvements were demonstrated at constant burn rate by replacing a 0.7 micrometers fine AP fraction with 2 micrometers AP and graphite linters.
- Solid Rocket Propellants