Heat-expandable beads as burning rate accelerators

Details Heat-expandable beads as burning rate accelerators Heat-expandable beads as burning rate accelerators

1982-05-05

1991-10-01

Lechert, Jr., Stephen J.

Explosive and thermic compositions or charges

Structure or arrangement of component or product

Particles of diverse size or shape

149 38, 149 42, 149 79, 149 92, 149 95, 149113, C06B 4500

Patent

active

050530887

ABSTRACT:
Mechanical enhancement of the burning rate of solid propellants is achieved y the incorporation of limited percentages of heat-expandable beads into the solid propellant matrix. When the flame front reaches an individual bead, the bead which contains an expanding or blowing agent (e.g., pentane, 4,4'-oxybis(benzenesulfonyl hydrazide) (Celogen OT), etc., expands to several times its volume and ruptures. Bead expansion or rupture causes a disruption of the propellant's surface, and the flame can penetrate into the propellant. This penetration results in a major increase in burning rate.

REFERENCES:
patent: 3671342 (1972-06-01), Slawinski
patent: 3977922 (1976-08-01), Inoue et al.
patent: 4008108 (1977-02-01), Chrisp
patent: 4034675 (1977-07-01), Sayles
patent: 4132740 (1979-01-01), Shoults
patent: 4133706 (1979-01-01), Shoults
patent: 4141766 (1979-02-01), Cameron et al.
patent: 4151022 (1979-04-01), Donaghue et al.
patent: 4304185 (1981-12-01), Sayles

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