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X‐ray Computed Tomography for Evaluation of Density Gradient Formation during the Compaction of Spray‐Dried Granules
Author(s) -
Deis Terry A.,
Lannutti John J.
Publication year - 1998
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.1151-2916.1998.tb02474.x
Subject(s) - agglomerate , compaction , materials science , relative humidity , humidity , composite material , mineralogy , chemistry , meteorology , physics
X‐ray computed tomography was used to quantify the internal structure of compacts made from poly(vinyl alcohol)‐containing spray‐dried agglomerates at specific levels of humidity. High humidities increased the average density but decreased the uniformity of the density distribution. Lower levels of humidity generally produced more diffuse high density zones. Internal uniformity is superior at lower humidities where agglomerate fracture is more common than gradual agglomerate deformation. SEM has been used to determine zone‐specific agglomerate behavior at 0% and 98% relative humidity. These results can be used to connect gradient development to compaction curve behavior.