Optical measurements of shock-induced chemical reactions in mixed aluminum-nickel powder
Optical pyrometer and high-speed photography experiments have been carried out to determine the temperature and temporal-spatial evolution of a chemical reaction zone in shock-loaded, nickel-aluminum powder mixtures. The temperature generated is about 5000/sup 0/K, and the reaction occurs on a 100 nanosecond or faster time scale. Experimental results are compared to numerical calculations, which suggest that there are threshold shock pressures and temperatures of about 15 GPa and 500/sup 0/C which are required to initiate the strong exothermic reaction. Further, excessive pressure appears to inhibit reaction. This observation is in agreement with previous experiments in which nickel-aluminum alloys were recovered from shock-loaded mixtures.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5626752
- Report Number(s):
- SAND-85-0498C; CONF-850736-21; ON: DE85014705
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
BINARY MIXTURES
CHEMICAL REACTIONS
DISPERSIONS
IMPACT SHOCK
MEASURING INSTRUMENTS
MIXTURES
NICKEL ALLOYS
PHOTOGRAPHY
POWDERS
PYROMETERS
SHOCK WAVES
STREAK PHOTOGRAPHY