High-temperature-stable ignition powder

Details High-temperature-stable ignition powder High-temperature-stable ignition powder

1983-11-15

1984-11-27

Lechert, Jr., Stephen J.

Explosive and thermic compositions or charges

Containing free boron or binary compounds of boron or boranes

149 16, 149 35, 149 37, 149105, 1491086, 1022025, C06B 4300, C06B 4710

Patent

active

044849605

ABSTRACT:
A mixture of about from 60 to 40 percent amorphous boron and about from 94 to 60 percent ferric oxide, useful as an ignition composition for electrically actuated blasting caps and squibs, has outstanding thermal stability, i.e., up to about 500.degree. C. making it especially suitable for use in blasting caps in oil wells that are deep and hot, e.g., in the liquid-disabled cap described in U.S. patent application Ser. No. 469,954. Bridgewire-sensitive compositions containing about from 10 to 20 percent boron are preferred. The compositions can be self-grained, or they may be grained preferably with a water-soluble polymeric binder.

REFERENCES:
patent: 2717204 (1955-09-01), Noddin et al.
patent: 3865035 (1975-02-01), Munson et al.

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