Abstract
Properties of virtually all ceramics are severely degraded by the presence of defects, which develop from powder packing irregularities in green bodies during the densification process.1–3 To produce good ceramics, it is crucial to characterize these irregularities in green bodies and to establish their relation to defects in the resultant ceramics. A recent study, using a new characterization tool,4–6 showed that all green bodies examined contained extremely large particles,5–8 aggregates5,6 and pores.9–11 Large pores in a green body were found to grow12,13 in accord with theory,14 forming large voids in the microstructure during compact densification. The behavior of large aggregates and particles during the densification process has not been well studied, and examination of their behavior appears to be interesting.
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