Stable initiator compositions and igniters
View Patent ↗High sparking initiator compositions with a controlled amount of power are disclosed. The initiator compositions comprise a metal containing oxidizing agent, at least one metal reducing agent, and a non-explosive binder. Low voltage igniters that provide bidirectional plumes upon ignition are also disclosed. These igniters have a electrically resistive element positioned across a hole in a support which directs the plume. These igniters and compositions are useful in the actuation of solid fuel heating unit, in particular, sealed heating units.
1. An initiator composition comprising a mixture including
a. a metal containing oxidizing agent
b. a metal reducing agent, and
c. a non-explosive binder,
wherein said mixture is characterized by release of a total amount of energy of 0.25 J to 8.5 J upon actuation and a deflagration time of 5 to 30 milliseconds at a composition thickness of 20 to 100 microns.
2. The initiator composition of claim 1 , wherein said mixture is characterized by a deflagration time of 5 to 20 milliseconds at a composition thickness of 40 to 100 microns.
3. The initiator composition of claim 1 , wherein said mixture is characterized by a deflagration time of 5 to 10 milliseconds at a composition thickness of 40 to 80 microns.
4. The initiator composition of claim 1 , wherein said metal reducing agent is selected from the group consisting of aluminum, zirconium and boron.
5. The initiator composition of claim 1 , wherein said metal containing oxidizing agent is selected from at least one of the following: a chlorate of an alkali, a chlorate of an alkali earth metal, a perchlorate of an alkali metal, a perchlorate of an alkali earth metal, and an oxide of a metal.
6. The initiator composition of claim 5 , wherein the said metal containing oxidizing agent is selected from at least one of the following: molybdenum trioxide, copper oxide, tungsten trioxide, potassium chlorate, and potassium perchlorate.
7. The initiator composition of claim 1 , wherein the composition comprises at least two metal reducing agents.
8. The initiator composition of claim 7 , wherein at least one of the at least two metal reducing agents is boron.
9. The initiator composition of claim 8 , wherein said composition comprises about 7–10% by weight of boron, based on total composition dry weight.
10. The initiator composition of claim 1 , wherein both the metal reducing agent and the metal-containing oxidizing agent comprise powders.
11. The initiator composition of claim 10 , wherein at least one of the metal reducing agent and the metal-containing agent comprise a powder of nanoparticle size.
12. The initiator composition of claim 10 , wherein both the metal reducing agent and the metal-containing oxidizing agent comprise powders of nanoparticle size.
13. The initiator composition of claim 1 , wherein said composition comprises about 25–75% by weight of said oxidizing agent, based on total composition dry weight.
14. The initiator composition of claim 1 , wherein said composition comprises about 25–75% by weight of said reducing agent, based on total composition dry weight.
15. The initiator composition of claim 1 , wherein said composition comprises less than about 15% by weight of said binder, based on total composition dry weight.
16. The initiator composition of claim 1 , wherein said composition comprises less than about 5% by weight of said binder, based on total composition dry weight.
17. The initiator composition of claim 15 , wherein the binder is inert.
18. The initiator composition of claim 17 , wherein the binder is selected from the group consisting of fluoro-carbon rubber and synthetic layered silicate.
19. The initiator composition of claim 1 , wherein said initiator composition is for use with electrical resistance actuation.
20. The initiator composition of claim 1 , wherein said initiator composition is for use with percussion actuation.
21. The initiator composition of claim 1 , wherein said initiator composition is for use with optical actuation.
22. The initiator composition of claim 21 , wherein said optical actuation is provided by a flashbulb.
23. The initiator composition of claim 1 , wherein the metal containing oxidizing agent comprises molybdenum trioxide, the metal reducing agent comprises aluminum and boron, and the non-explosive binder comprises fluoro-carbon rubber.
24. An initiator composition comprising about 26–27% by weight of aluminum, about 51–52% by weight of molybdemun trioxide, about 7–8% by weight of boron, and about 14–15% by weight of fluoro-carbon rubber, based on total composition dry weight.