Deflagration-to-detonation transition project. Quarterly report, June-August 1979
- ed.
Development of the MC3533 detonator began; a contract was placed for determination of suitable ignition conditions and hardware was fabricated for planned component shock ignition tests. Performance studies were planned to optimize DDT detonator design. The feasibility of utilizing ceramic varistors of several compositions to protect detonators from inadvertent ignition from an electrostatic discharge stimulus was established. Several mixtures of the explosive 2-(5-cyanotetrazolato)pentaamminecobalt-(III) perchlorate (CP) with other constituents were screened as igniter powders for the MC3196A detonator. It was shown that with the spark gap of the MC3423 detonator removed, a voltage in excess of 15 kV is required to fire the device. This establishes the fact that the spark gap provides suitable protection, since its breakdown is at a considerably lower voltage. The output of the MC3423 detonator has been increased by increasing the density and mass of CP in the output column. Electrothermal response testing was performed on MC3423 igniters which had had their bridgewires pressed against the header surface prior to loading. These units easily met all-fire and no-fire goals. Chemical and physical compatibility studies have continued. The coefficient of thermal expansion of CP has been found to be approx. 60 x 10/sup -6/ mm/mm-/sup 0/C. Impact testing of CP lot 47344 has reconfirmed the conclusion that the material exhibits greatest sensitivity in the form of unconfined pellets. Photoacoustic spectra were obtained for CP, its precursors, and known reaction products. Continuing studies of CP analogs showed that none of the analogs examined in confined pellet form is as sensitive to ignition from an electrostatic discharge as is CP. NMR spectra were obtained of loosely packed CP and its solution in DMSO. Optical measurements of CP (1.3 Mg/m/sup 3/) DDT by fiber optic techniques yielded a stable deflagration rate of 0.54 km/s and transition at approx. 8 ..mu..s.
- Research Organization:
- Sandia Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 5391637
- Report Number(s):
- SAND-80-0230/1
- Country of Publication:
- United States
- Language:
- English
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