Effects of shock modification on the self-propagating high temperature synthesis of nickel aluminides
Composite nickel-aluminum particles and compositionally similar mixtures of nickel and aluminum powders were subjected to controlled shock modification prior to initiation of a self-sustained high temperature synthesis reaction. For the mixed powders the shock event caused extensive mixing of the Ni and Al on a scale much finer than the original particle dispersion. In addition, an exothermic reaction associated with formation of an intermetallic composition was observed at a temperature below the normal initiation temperature of unshocked powders. For the shocked composite particles, no fine scale mixing was observed and no preinitiation exothermic events were noted. We concluded that shock-induced mixing of reactants leads to enhanced reactivity.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); North Carolina State Univ., Raleigh (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6168767
- Report Number(s):
- SAND-87-0830C; CONF-870753-39; ON: DE87012729
- Country of Publication:
- United States
- Language:
- English
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