Influence of shock compression on the specific surface area of inorganic powders. [alumina, manganese dioxide, hematite and magnetite]

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5444897

Williams, F L; Morosin, B; Graham, R A

Four characteristic behaviors as a function of peak shock pressure have been observed for changes in the specific area of inorganic powders modified by shock wave loading. The mechanisms producing the observed responses appear to be abrupt phase change, communition of particles and interparticle bonding. Recently, classical BET surface area measurements were reported for compacts of aluminum oxide, zinc oxide, aluminum nitride, titanium carbide and titanium diboride after they were subjected to controlled shock-loading to mean peak pressures from 4 to 27 GPa. Extension to specific surface area measurements of shock loaded hematite, magnetite, manganese dioxide and well annealed alumina powders has been accomplished. Sampling from the edge, center and the bulk of shock-loaded compacts of these powders reveals variation in the degree of modification consistent with the calculated variation of the shock pressure and shock temperature. It was also found that the apparent response of a material to shock-loading can be masked if the starting material is already highly defected. The nature of morphological changes in powders is of interest in understanding shock activated sintering, shock enhanced catalytic activity, dynamic compaction and shodk-enhanced solid state reactivity. 8 refs., 5 tabs.

• Research Organization: New Mexico Univ., Albuquerque (USA). Dept. of Chemical and Nuclear Engineering; Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5444897
• Report Number(s): SAND-85-1706C; CONF-850770-5; ON: DE85016816
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COMPACTS
COMPRESSION
DATA
DENSITY
EXPERIMENTAL DATA
HEMATITE
INFORMATION
IRON COMPOUNDS
IRON ORES
IRON OXIDES
MAGNETITE
MANGANESE COMPOUNDS
MANGANESE OXIDES
MINERALS
NUMERICAL DATA
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
SHOCK WAVES
SURFACE AREA
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE