Extrusion freeforming of ceramics through fine nozzles

Thermoplastic suspensions of 55 vol.% zirconia in a wax-based vehicle were extruded through a range of fine nozzles with diameters from 76 to 510 μm. Fixed pressure extrusion under a maximum nitrogen gas pressure of 350 kPa and an extrusion temperature of 175 °C were used. The ability of unfiltered...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2003-04, Vol.23 (5), p.629-635
Main Authors: Grida, Imen, Evans, Julian R.G.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Extrusion freeforming
Fused deposition
General studies
Latticework
Technical ceramics
ZrO 2
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Summary:Thermoplastic suspensions of 55 vol.% zirconia in a wax-based vehicle were extruded through a range of fine nozzles with diameters from 76 to 510 μm. Fixed pressure extrusion under a maximum nitrogen gas pressure of 350 kPa and an extrusion temperature of 175 °C were used. The ability of unfiltered suspensions to flow in fine nozzles depended critically on the mixing method. Ceramic latticework in the form of structures suitable for bone substitute scaffolds were created by extrusion freeforming, a process also known as fused deposition modelling (FDM) or fused deposition of ceramics (FDC). However, precisely ordered deposition could not be obtained by fixed pressure extrusion with a 55 vol.% suspension because of rate variations due to slight mixing inhomogeneities. The quality of welds was examined. Heat transfer considerations show that the use of thermoplastic suspensions is not ideal for fine (
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(02)00163-2