Abstract
Gamma-ray attenuation measurements enable nondestructive analysis of density heterogeneities which evolve during the processing of ceramics and ceramic composites by powder consolidation methods. A densitometer apparatus has been constructed at the Pacific Northwest Laboratory or use in situ measurement of porosity and composition as a function of time and position during powder compaction and sintering. Attenuation experiments were performed with aqueous suspensions of colloidal ..cap alpha..-Al/sub 2/O/sub 3/ to evaluate the sensitivity of the gamma-ray densitometer and also to investigate the role of pH on compaction processes during sedimentation. One of the concerns with this technique is whether the gamma radiation degrade sample solvents or dispersing agents; no evidence of radiation damage was revealed in aqueous polymer solutions, based on analysis with gas chromatography, ion chromatography, and nuclear magnetic resonance spectroscopy. 29 refs., 6 figs.
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