Time-resolved pressure measurements in chemically reacting powder mixtures

Conference · Sun Jul 10 00:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

DOI:https://doi.org/10.1063/1.46450· OSTI ID:6977190

Dunbar, E ^[1]; Graham, R A; Holman, G T; Anderson, M U ^[2]; Thadhani, N N ^[3]

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1. New Mexico Tech, EMRTC, Socorro, New Mexico 87801 (United States)
2. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
3. Georgia Institute of Technology, Schoool of Materials Science and Engineering, Atlanta, Georgia 30332 (United States)

PVDF piezoelectric polymer stress-rate gauges have been used to detect and record stress pulses input to and propagated through powder mixtures of 5Ti+3Si at densities of 53%. Data are obtained for the porous solid crush-up'' and in the chemically reacting state. Wave speed is determined to an accuracy of 0.1% and serves as a sensitive and overt indication of chemical reactions. Compressed-gas gun and high explosive loading experiments show a crush strength of about 1 GPa. Strong exothermic chemical transformation is indicated by large increases in wave speed to expanded volume states. The degree of reaction is approximately 50%. The pressure measurements are supplemented by studies of shock treated powder mixtures preserved for post-shock analysis which determine the effect of particle size and morphology on reaction threshold and degree of reaction. The materials response is consistent with Graham's CONMAH conceptual model of shock-induced solid state chemistry reaction. [copyright]American Institute of Physics

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6977190
• Report Number(s): CONF-921145--
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (United States), Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Vol. 309:1; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CHEMICAL REACTIONS
COMPRESSION
PARTICLE SIZE
POWDERS
PRESSURE MEASUREMENT
SHOCK WAVES
SILICIDES
SILICON COMPOUNDS
SIZE
SYNTHESIS
TIME DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM SILICIDES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE