Plastic and nonmetallic article shaping or treating: processes – Explosive or propellant article shaping or treating – Rolling to form sheet or rod
Patent
1973-11-29
1976-08-03
Lechert, Jr., Stephen J.
Plastic and nonmetallic article shaping or treating: processes
Explosive or propellant article shaping or treating
Rolling to form sheet or rod
149 76, 149 193, 149 1991, 149 1992, C06B 2100
Patent
active
039729672
ABSTRACT:
A method is disclosed for curing a nitrogen-fluorine propellant in an eleomagnetic alternating field. The propellant is cast into thin walled-titanium tubes of predetermined size and with a graphite-epoxy overwrap. When the propellant-filled tubes are exposed to electromagnetic radiation, the propellant is cured to a grain in about 30 minutes as compared to about 5 days required for thermal curing at 135.degree.F. The disclosed method of curing is achieved because of the permeability of the overwrapped tubes to microwaves. The grain cured by the disclosed method acquires the desired mechanical properties, particulary, a greater uniformity, as indicated by a higher Shore hardness value, within a considerably shorter time period. The greater uniformity of mechanical properties throughout the propellant grain is particularly essential for this application because of the small quantity of propellant and the thrust repeatability necessary from one micromotor to another in the Maneuver Motor Array. Accelerated rate of cure is particularly advantageous because of the shortened turn-around time for the motor casting equipment. This is particularly desired because of the large number of motor tubes which must be cast for each array (112 tubes per array).
REFERENCES:
patent: 3070470 (1962-12-01), Argabright et al.
Gapcynski William G.
Lechert Jr. Stephen J.
Neureither Lawrence A.
The United States of America as represented by the Secretary of
Voigt Jack W.
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