期刊
MATERIALS CHARACTERIZATION
卷 81, 期 -, 页码 111-123出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2013.04.004
关键词
X-ray tomography; Compaction; Nanopowder; Porosity; Ceramic
Compaction process, the aim of which being to obtain green bodies with low porosity and small size, is often used before sintering treatment. Prior to die filling, the ceramic powder is generally granulated to improve flowability. However during compaction, density heterogeneity and critical size defects may appear due to intergranule and granule-die wall frictions. In this work, the influence of granule formulation on the compact morphology has been studied. To do so, a compaction setup was installed inside an X-ray tomography equipment so that the evolution of the compact morphology could be analysed during the whole compaction process. We have demonstrated that high humidity rate and the addition of binder in the granule formulation increase density heterogeneity and generate larger defects. (C) 2013 Elsevier Inc. All rights reserved.
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