IMPROVEMENT OF THE USEFULNESS OF PYROLYTIC GRAPHITE IN ROCKET MOTOR APPLICATIONS. Annual Technical Summary Report No. 2
Technical Report
·
OSTI ID:4718948
Work on the application of pyrolytic graphite in high performance solid propellant motors is described. Studies of the deposition process variables cortinued with emphasl on methods of improving the microstructure of coatings formed at lower deposition temperatures. A substrate pretreatment consisting of a furane resin impregnation shows promise. Emphasis was placed on the measurement of the erosion rate of nozzles coated with a standard (2000 deg C) grade of pyrolytic graphite in rocket motor firings. For propellants with flame temperatures of 5600 and 6000 deg F, the erosion rate was very low. With a 6500 deg F propellant, erosion increased with increasing motor pressure and reached a rate near 0.5 mil/sec at about 900 psi. This indicates the utility of pyrolytic graphite for solid propellant rocket nozzles. Mechanical design and stress analysis calculations were made; based on these, the utility of segmerted nozzle designs was substartiated. (auth)
- Research Organization:
- Atlantic Research Corp., Alexandria, Va.
- NSA Number:
- NSA-17-011076
- OSTI ID:
- 4718948
- Report Number(s):
- AD-278371
- Country of Publication:
- United States
- Language:
- English
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