Solutions for resistance-after-fire problems in an electric match
Current leakage in an electric match after firing is a problem if it drains power that can be used elsewhere or if it induces unwanted fluctuations in other electrical circuits. Two novel techniques are described that significantly reduce the RAF sensitivity of a Ti/KClO/sub 4/-loaded electric match used to ignite the pyrotechnic materials in a thermal battery. In the first technique, a thin (less than 10 ..mu..m thick) film insulator, such as Parylene or SiO/sub 2/, is vapor deposited within the match cavity prior to the loading of the pyrotechnic. The insulator tends to smooth the cavity surface as an aid to ejection of firing residues and to decrease the exposed metal surface area to prevent pin-to-pin short circuits. The second technique involves placing a length of heat-shrinkable tubing on the match extending from the output end so that the shrink tubing is activated by the heat of the match and the thermal battery when fired. The shrinkage of the tubing effectively decreases the cross-sectional area for mass and heat transfer from the battery back into the match. 5 figures, 2 tables.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5284166
- Report Number(s):
- SAND-80-0269C; CONF-800713-13
- Resource Relation:
- Conference: 7. international pyrotechnics seminar, Vail, CO, USA, 14 Jul 1980
- Country of Publication:
- United States
- Language:
- English
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THERMAL BATTERIES
IGNITION
PYROTECHNIC DEVICES
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EXPERIMENTAL DATA
THERMAL CONDUCTIVITY
DATA
ELECTRIC BATTERIES
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ENERGY STORAGE SYSTEMS
INFORMATION
NUMERICAL DATA
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
250903* - Energy Storage- Batteries- Materials
Components
& Auxiliaries