Additive approach to ballistic and slag melting point control of azide-based gas generant compositions
First Claim
1. A composition for generating nitrogen gas and suitable for inflating vehicle occupant restraint systems, consisting essentially of (all percents by weight):
- A. between about 65 and 74 percent azide fuel,B. between about 17 and 29.5 percent of a primary oxidizer selected from the group consisting of iron oxide, chromium oxide, manganese oxide, cobalt oxide, copper oxide, vanadium oxide and mixtures thereof,C. between about 1.0 and 6.0 percent co-oxidizer selected from the group consisting of metal nitrites, nitrates and mixtures thereof;
D. between about 2.34 and 8.0 percent of a mixture of metal oxides selected from the group consisting of SiO2, Al2 O3 and TiO2,E. up to about 6.0 percent bentonite, andF. up to about 4.0 percent molybdenum disulfide,said composition having a burning rate between about 0.8 and 1.5 inches per second.
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0 Petitions
Accused Products
Abstract
Gas generant pyrotechnic compositions especially suitable for inflating vehicle occupant restraint systems with nitrogen gas are described. The compositions are comprised (in wt. %) of about 65-74% of an azide, preferably sodium azide; about 17-29.5% of iron oxide, preferably ferric oxide; and about 1.0-6% metal nitrite or nitrate co-oxidizer, preferably sodium nitrate; to which base composition is added about 0.5-8% silica, alumina, titania or mixtures thereof; up to 6% bentonite and up to 4% molybdenum disulfide. Preferred driver and passenger side formulations are disclosed. The compositions burn from about 0.8 to 1.5 inches per second, have excellent slag and clinker properties, as well as excellent aging and mechanical strength characteristics when formed into cylindrical pellets or wafers. The formulation ingredients are amenable to water slurry mixing, spray drying and machine pressing into cylindrical pellets or wafers for insertion into a suitable gas generating device.
32 Citations
20 Claims
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1. A composition for generating nitrogen gas and suitable for inflating vehicle occupant restraint systems, consisting essentially of (all percents by weight):
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A. between about 65 and 74 percent azide fuel, B. between about 17 and 29.5 percent of a primary oxidizer selected from the group consisting of iron oxide, chromium oxide, manganese oxide, cobalt oxide, copper oxide, vanadium oxide and mixtures thereof, C. between about 1.0 and 6.0 percent co-oxidizer selected from the group consisting of metal nitrites, nitrates and mixtures thereof; D. between about 2.34 and 8.0 percent of a mixture of metal oxides selected from the group consisting of SiO2, Al2 O3 and TiO2, E. up to about 6.0 percent bentonite, and F. up to about 4.0 percent molybdenum disulfide, said composition having a burning rate between about 0.8 and 1.5 inches per second. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A composition for generating nitrogen gas consisting of (all percents by weight):
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A. about 68.12 percent sodium azide, B. about 20.54 percent ferric oxide, C. about 5.0 percent sodium nitrate, D. about 0.34 percent SiO2, E. about 2.0 percent Al2 O3, F. about 3.0 percent bentonite, and G. about 1.0 percent molybdenum disulfide.
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18. A composition for generating nitrogen gas consisting of (all percents by weight):
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A. about 66.81 percent sodium azide, B. about 23.35 percent ferric oxide, C. about 3.5 percent sodium nitrate, D. about 0.34 percent SiO2, E. about 5.0 percent Al2 O3, and F. about 1.0 percent molybdenum disulfide.
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19. A composition for generating nitrogen gas consisting of (all percents by weight):
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A. about 66.57 percent sodium azide, B. about 23.85 percent ferric oxide, C. about 2.50 percent sodium nitrate, D. about 0.33 percent SiO2 E. about 5.00 Al2 O3, and F. about 1.75 molybdenum disulfide.
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20. A composition for generating nitrogen gas consisting of (all percents by weight):
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A. about 68.35 percent sodium azide, B. about 24.56 percent ferric oxide, C. about 2.50 percent sodium nitrate, D. about 0.34 percent SiO2, E. about 2.50 percent Al2 O3, and F. about 1.75 percent molybdenum disulfide.
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Specification
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- Resources
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Current AssigneeAutoliv ASP Incorporated (Autoliv Incorporated), the united states of america as represented by the secretary of the navy
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Original AssigneeMorton International Incorporated (Autoliv Incorporated)
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InventorsHuntsman, Lewis R., Taylor, Robert D.
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Primary Examiner(s)Miller, Edward A.
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Application NumberUS07/926,119Time in Patent Office916 DaysField of Search149/35US Class Current149/35CPC Class CodesC06B 35/00 Compositions containing a m...C06D 5/06 by reaction of two or more ...
