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Packing and solidification in ceramic injection moulding

Published online by Cambridge University Press:  31 January 2011

S. Krug ,
J. R. G. Evans  and
J. H. H. ter Maat
S. Krug
Affiliation:
Department of Materials, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom
J. R. G. Evans
Affiliation:
Department of Materials, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom
J. H. H. ter Maat
Affiliation:
BASF Aktiengesellschaft, 67056 Ludwigshafen, Germany
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Abstract

The occupation of volume in large ceramic injection mouldings solidified under different pressures using two moulding techniques is considered. Large (60 × 45 × 25 mm) alumina injection mouldings were prepared in cavities fitted with conventional (metallic) and insulated [poly(ether ether ketone)] sprues. These provide quite distinct solidification histories which, in turn, influence the physical properties of the moulding and the extent and type of defects it contains. In the former case, the gate solidified after 26 s whereas, in the latter, the hold pressure could be applied for over 240 s. In insulated sprue moulding, the advance of the solid liquid boundary during packing and solidification was traced by fractography. Pressure was varied from 5 to 120 MPa. The interdependencies of moulding mass, apparent density, local density, polymer crystallinity, and microstructure were accounted for as a function of pressure and pressure transmission method. Changes in polymer crystallinity due to different cooling rates at different positions in the mouldings were insufficient to account for observed density differences. Systematic changes in the mass as a function of hold pressure were related to macroporosity in conventional mouldings and to microporosity in insulated sprue mouldings.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 6 , June 2001 , pp. 1829 - 1837
Copyright
Copyright © Materials Research Society 2001

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References

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