Liquid electrically initiated and controlled gas generator composition
A liquid electrically initiated and controlled composition comprising an oxidizer, soluble fuel additive(s), and other optional additives to enhance the chemical or ballistic properties, or a combination thereof is disclosed. The liquid composition further comprises stabilizers to enhance thermal stability, sequestrants to minimize deleterious effects of transition metal contaminants, and combustion enhancers maximizing efficiency. Buffers and heavy metal sequestering or complexing agents may be used in combination to achieve the highest degree of thermal stability. Additional ionic co-oxidizers may be added to the liquid composition to stabilize the liquid oxidizer and further depress freezing point. The liquid phase of matter allows flow via pipes or tubes from tanks, reservoirs, or other containers, through metering valves, followed by ignition or combustion modulation when stimulated by electrodes, statically or dynamically.
1. A method of controlling gas generation, the method comprising the steps of:
a. providing an electrically controlled gas generator composition comprising:
i. oxidizer containing hydroxylammonium nitrate (HAN) at 65-79 percent by weight;
ii. fuel additive at 15-30 percent by weight;
iii. a stabilizer and sequestrant at 0.1-1.0 percent by weight;
iv. a buffer containing ammonium dihydrogen phosphate at 0.1-1.0 percent by weight; and
v. a surfactant containing n-octanol at 0.1-0.5 percent by weight;
b. providing an electrode in contact with said gas generator composition; and
c. applying an electrical voltage to said gas generator composition via said electrode.
2. The method according to claim 1 wherein the fuel additive is selected from the group consisting of cyclic saccharides, complex sugars/polysaccharides and polyhydroxyl compounds soluble in liquid HAN oxidizer matrix.
3. The method according to claim 1 wherein the stabilizer and sequestrant is 2,2′-Bipyridyl.
4. The method according to claim 1 wherein said gas generator composition further comprises a desensitizer at 1-3 percent by weight.
5. The method according to claim 4 wherein the desensitizer is water.
6. The method according to claim 1 wherein said gas generator composition further comprises a combustion enhancer at 1-3 percent by weight.
7. The method according to claim 6 wherein the combustion enhancer is a polynitrogen compound selected from the group consisting of 5-aminotetrazole and 1,2,4-triazole.
8. The method according to claim 1 wherein said gas generator composition further comprises a co-oxidizer at 2-7 percent by weight.
9. The method according to claim 8 wherein the co-oxidizer is selected from the group consisting of ammonium nitrate, methyl ammonium nitrate and hydroxyethylammoniumformate.