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Dynamic Compaction of Aluminum Nitride Powder: Hugoniot Measurement and Comparison with Static Behavior
Author(s) -
GOURDIN W. H.,
WEINLAND S. L.
Publication year - 1985
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1985.tb10123.x
Subject(s) - compaction , materials science , nitride , relative density , shock (circulatory) , aluminium , compression (physics) , shock wave , composite material , dynamic compaction , thermodynamics , sintering , layer (electronics) , medicine , physics
A limited number of shock Hugoniot measurements were performed on two unsintered aluminum nitride powder compacts having initial densities of 1.30 and 1.53 g/cm 3 . Stresses achieved ranged from 0.25 to 1.8 GPa, corresponding to linear compaction rates of 0.2 to 0.6 km/s. Densification is incomplete behind the first shock wave, proceeding only to ∼70% of the solid density, regardless of the initial density. On reshock, however, significantly higher densities are achieved. Initial compaction of the powder to a relative density of 65% to 70% occurs readily at stresses below 0.25 GPa. For greater stresses, however, densification is slight. Comparisons with static compression data for the same powders suggest that this resistance to compaction is an effect of compaction rate.