Low pressure exponent propellants containing boron
First Claim
1. A cured composite propellant grain consisting essentially of:
- A. from about 50% to about 75% by weight of an oxidizer consisting essentially of ammonium nitrate;
B. from about 1% to about 20% by weight of a cured polymeric binder;
C. from 0% to about 30% by weight of a nitrate ester plasticizer;
D. from about 3.5% by weight to about 8% by weight of boron in free elemental form; and
E. from 0% to about 3% by weight aluminum metal;
said propellant having a pressure exponent not exceeding about 0.30 at a combustion pressure between about 2500 and about 7000 pounds per square inch (between about 1700 and about 4800 N/cm2).
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Accused Products
Abstract
Propellant grain consisting essentially of:
A. from about 50% to about 75% by weight of an oxidizer consisting essentially of ammonium nitrate;
B. from about 1% to about 20% by weight of a cured polymeric binder;
C. from 0% to about 30% by weight of a nitrate ester plasticizer;
D. from about 3.5% to about 8% by weight of boron in free elemental form; and
E. from 0% to about 3% by weight of aluminum metal.
The grain has a pressure exponent not exceeding about 0.30 at a combustion pressure between about 2500 and about 7000 pounds per square inch (between about 1700 and about 4800 N/cm2). Also, an uncured pourable slurry having the formula stated above, except that the binder is uncured. Also, a method for forming a propellant grain having the formula stated above, comprising the steps of providing the uncured pourable slurry defined above, pouring the slurry into a casing, and curing the slurry in situ to form a cured propellant grain having a pressure exponent not exceeding about 0.30 in the pressure range defined above.
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Citations
18 Claims
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1. A cured composite propellant grain consisting essentially of:
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A. from about 50% to about 75% by weight of an oxidizer consisting essentially of ammonium nitrate; B. from about 1% to about 20% by weight of a cured polymeric binder; C. from 0% to about 30% by weight of a nitrate ester plasticizer; D. from about 3.5% by weight to about 8% by weight of boron in free elemental form; and E. from 0% to about 3% by weight aluminum metal;
said propellant having a pressure exponent not exceeding about 0.30 at a combustion pressure between about 2500 and about 7000 pounds per square inch (between about 1700 and about 4800 N/cm2). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An uncured propellant composition in the form of a pourable slurry which is curable at ambient pressure to form a solid propellant grain, said slurry consisting essentially of:
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A. from about 50% to about 75% by weight of an oxidizer consisting essentially of ammonium nitrate; B. from about 1% to about 20% by weight of an uncured polymeric binder; C. from 0% to about 30% by weight of a nitrate ester plasticizer; D. from about 3.5% to about 8% by weight of boron in free elemental form; and E. from 0% to about 3% by weight of aluminum metal; said propellant being curable to form a grain having a pressure exponent not exceeding about 0.30 at a combustion pressure between about 2500 and about 7000 pounds per square inch (between about 1700 and about 4800 N/cm2). - View Dependent Claims (18)
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Specification