Relaxation patterns in powder injection mouldings made with repeated flow Reversals

Injection moulding suspensions based on both high and low molecular weight organic vehicles and incorporating both spherical and anisotropically shaped particles were prepared. A double end-gated rectangular bar cavity was used for injection moulding. Conventional mouldings were made by injection fr...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 1999-01, Vol.19 (4), p.411-417
Main Authors: Zhang, T, Evans, J.R.G, Bevis, M.J
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
General studies
injection moulding, Al 2O 3
Metal powders
Metals. Metallurgy
microstructure—prefiring
Powder metallurgy. Composite materials
Production techniques
shaping
suspensions
Technical ceramics
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Summary:Injection moulding suspensions based on both high and low molecular weight organic vehicles and incorporating both spherical and anisotropically shaped particles were prepared. A double end-gated rectangular bar cavity was used for injection moulding. Conventional mouldings were made by injection from one gate followed by static hold pressure. Modulated pressure mouldings were made in the same way but reciprocating flow was induced between the gates during solidification. The mouldings were sectioned, polished and heat treated whereupon a pattern of rings emerged in relief preserving the history of flow reversals as the solid-liquid interface advanced from the mould walls.
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(98)00225-8