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US5143567A
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Additive approach to ballistic and slag melting point control of azide-based gas generant compositions
Assignee: Autoliv ASP Inc
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Filing: 1991-08-23
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Granted: 1992-09-01
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Expires: 2011-08-23
Abstract
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 17-25% of iron oxide, preferably ferric oxide; and about 3.5-6% metal nitrite or nitrate co-oxidizer, preferably sodium nitrate; to which base composition is added about 2.5-8% 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 1.0 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.
Inventors
- 👤 Robert D. Taylor
- 👤 Lewis R. Huntsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:36
CPC Classifications
C; C06; C06B; C06B35/00; C06D; C06D5/00; C06D5/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
110 words
A composition for generating nitrogen gas consisting essentially of (all percents by weight): A. between about 65 and 74 percent of azide fuel, B. between about 17 and 25 percent iron oxide oxidizer, C. between about 3.5 and 6.0 percent of a co-oxidizer selected from the group consisting of metal nitrites, nitrates and mixtures thereof, D. between about 2.5 and 8.0 percent of a metal oxide additive selected from the group consisting of silica, alumina, titania and mixtures thereof, E. up to about 6.0 percent bentonite, and F. up to about 4.0 percent molybdenum disulfide, said composition having a controllable burning rate between about 1.0 and 1.5 inches per second.
Claim 2
Dependent Claim
110 words
A composition for generating nitrogen gas consisting essentially of (all percents by weight): A. between about 65 and 74 percent of azide fuel, B. between about 17 and 25 percent iron oxide oxidizer, C. between about 3.5 and 6.0 percent of a co-oxidizer selected from the group consisting of metal nitrites, nitrates and mixtures thereof, D. between about 2.5 and 8.0 percent of a metal oxide additive selected from the group consisting of silica, alumina, titania and mixtures thereof, E. up to about 6.0 percent bentonite, and F. up to about 4.0 percent molybdenum disulfide, said composition having a controllable burning rate between about 1.0 and 1.5 inches per second.
Claim 3
Dependent Claim
19 words
A composition according to claim 1 wherein said fuel is at least one alkali or alkaline earth metal azide.
Claim 4
Dependent Claim
16 words
A composition according to claim 2 wherein said fuel is at least one alkali metal azide.
Claim 5
Dependent Claim
12 words
A composition according to claim 3 wherein said fuel is sodium azide.
Claim 6
Dependent Claim
13 words
A composition according to claim 1 wherein said iron oxide is ferric oxide.
Claim 7
Dependent Claim
15 words
A composition according to claim 1 wherein co-oxidizer is at least one alkali metal nitrate.
Claim 8
Dependent Claim
12 words
A composition according to claim 6 wherein said co-oxidizer is sodium nitrate.
Claim 9
Dependent Claim
17 words
A composition according to claim 1 wherein said additive consists of a mixture of silica and alumina.
Claim 10
Dependent Claim
18 words
A composition according to claim 8 wherein between about 2.5 and 5.0 percent of said additive is present.
Claim 11
Dependent Claim
16 words
A composition according to claim 9 wherein between about 3.0 and 6.0 percent bentonite is present.,
Claim 12
Dependent Claim
18 words
A composition according to claim 8 wherein between about 5.0 and 8.0 percent of said additive is present.
Claim 13
Dependent Claim
15 words
A composition according to claim 11 wherein less than about 3.0 percent bentonite is present.
Claim 14
Dependent Claim
14 words
A composition according to claim 10 wherein about 1 percent molybdenum disulfide is present.
Claim 15
Dependent Claim
14 words
A composition according to claim 12 wherein about 1 percent molybdenum disulfide is present.
Claim 16
Dependent Claim
52 words
A composition for generating nitrogen gas consisting of (all percents by weight): A. about 67.96 percent sodium azide, B. about 20.54 percent ferric oxide, C. about 5.0 percent sodium nitrate, D. about 0.5 percent silica, E. about 2.0 percent alumina, F. about 3.0 percent bentonite, and G. about 1.0 percent molybdenum disulfide.
Claim 17
Dependent Claim
52 words
A composition for generating nitrogen gas consisting of (all percents by weight): A. about 67.96 percent sodium azide, B. about 20.54 percent ferric oxide, C. about 5.0 percent sodium nitrate, D. about 0.5 percent silica, E. about 2.0 percent alumina, F. about 3.0 percent bentonite, and G. about 1.0 percent molybdenum disulfide.
Claim 18
Dependent Claim
47 words
A composition for generating nitrogen gas consisting of (all percents by weight): A. about 66.65 percent sodium azide, B. about 23.35 percent ferric oxide, C. about 3.5 percent sodium nitrate, D. about 0.5 percent silica, E. about 5.0 percent alumina, and F. about 1.0 percent molybdenum disulfide.
Claim 19
Dependent Claim
47 words
A composition for generating nitrogen gas consisting of (all percents by weight): A. about 66.65 percent sodium azide, B. about 23.35 percent ferric oxide, C. about 3.5 percent sodium nitrate, D. about 0.5 percent silica, E. about 5.0 percent alumina, and F. about 1.0 percent molybdenum disulfide.
Claim 20
Dependent Claim
131 words
A composition for generating nitrogen gas consisting essentially of (all percents by weight): A. between about 65 and 74 percent of azide fuel, B. between about 17 and 25 percent of an 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 3.5 and 6.0 percent of a co-oxidizer selected from the group consisting of metal nitrites, nitrates and mixtures thereof, D. between about 2.5 and 8.0 percent of a metal oxide additive selected from the group consisting of silica, alumina, titania and mixtures thereof, E. up to about 6.0 percent bentonite and F. up to about 4.0 percent molybdenum disulfide, said compositions having a controllable burning rate between about 1.0 and 1.5 inches per second.
Claim 21
Dependent Claim
131 words
A composition for generating nitrogen gas consisting essentially of (all percents by weight): A. between about 65 and 74 percent of azide fuel, B. between about 17 and 25 percent of an 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 3.5 and 6.0 percent of a co-oxidizer selected from the group consisting of metal nitrites, nitrates and mixtures thereof, D. between about 2.5 and 8.0 percent of a metal oxide additive selected from the group consisting of silica, alumina, titania and mixtures thereof, E. up to about 6.0 percent bentonite and F. up to about 4.0 percent molybdenum disulfide, said compositions having a controllable burning rate between about 1.0 and 1.5 inches per second.
References Cited (Backward Citations)
US2981616A
Cited
US3904221A
Cited
US3883373A
Cited
US3947300A
Cited
US4094028A
Cited
US4203787A
Cited
US4296084A
Cited
US4533416A
Cited
US4376002A
Cited
US4547235A
Cited
US4604151A
Cited
US4696705A
Cited
US4698107A
Cited
US4834818A
Cited
US4806180A
Cited
US4836255A
Cited
US4981536A
Cited
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