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Flow Patterns in Green Bodies Made by High-Speed Centrifugal Compaction Process
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Flow Patterns in Green Bodies Made by High-Speed Centrifugal Compaction Process

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Abstract:

High-Speed Centrifugal Compaction Process (HCP) is a wet compacting method, in which powders are compacted under a huge centrifugal force. The HCP was well applied to small alumina specimens, but the compact easily cracked when we applied the HCP to other materials. In the present study we clarify the mechanism that introduces such cracks. Firstly, we observed HCP alumina, dyeing with iron oxide powder or by the Immersion Liquid Technique, and found that there was a kind of flow pattern generated during the HCP. A simple simulation also revealed that the formation of such a flow pattern was related to the Colioli’s force in the centrifugal field, and therefore was hard to suppress. Nonetheless, the actual introduction of inhomogeneity along the flow was largely affected by another factor. Die releasing oil was dragged in the flows and formed low density regions along the flow.

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Periodical:

Materials Science Forum (Volumes 534-536)

Pages:

285-288

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.534-536.285

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Online since:

January 2007

Authors:

Hiroyuki Y. Suzuki, Katsuaki Urabe, Tomoki Takano, Hidenori Kuroki

Keywords:

Colioli's Force, Flow in Centrifugal Field, High Speed Centrifugal Compaction Process, Immersion Liquid Technique, Simulation

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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