Water based coating for gas generating material and method
AssigneeTRW Vehicle Safety Systems Inc.
InventorGeorge W. Goetz
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Abstract
A gas generating grain has a water-based particulate booster coating thereon. The coating comprises an alkali metal azide, a water-soluble inorganic oxidizer in approximately a stoichiometric ratio of oxidizer to azide, and a nucleating amount of a small particle size metal oxide. The inorganic oxidizer is potassium perchlorate. A preferred metal oxide is selected from the group consisting of iron oxide, nickel oxide and aluminum oxide. The coating is applied to the grain from a water slurry and dried.
Claims24
A gas generating grain having a particulate booster coating thereon, said coating comprising an alkali metal azide, a water-soluble inorganic oxidizer, said oxidizer being potassium perchlorate, and a water-insoluble metal oxide, said coating being applied to said grain as a slurry and dried.
A gas generating grain having a particulate booster coating thereon, said coating being free of a metal fuel and comprising an alkali metal azide, a water-soluble inorganic oxidizer in approximately a stoichiometric ratio of oxidizer to azide, said oxidizer being potassium perchlorate, and a nucleating amount of a water-insoluble metal oxide, said coating being applied to said grain as a water slurry and dried.
A method for making a gas generating grain having a booster coating thereon, comprising the steps of:
- (a) preparing said grain;
- (b) preparing a coating slurry comprising water, an alkali metal azide, a water soluble inorganic oxidizer in approximately a stoichiometric ratio of oxidizer to azide, said oxidizer being potassium perchlorate, and a water-insoluble metal oxide;
- (c) applying said coating slurry to said grain,
- (d) removing excess coating slurry from said grain, and
- (e) drying said grain and the coating thereon.
Dependencies are inferred from the claim text.