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Monoclinic Zirconia Bodies by Thermoplastic Ceramic Extrusion

Scheying, Gerd and Wührl, Ingrid and Eisele, Ulrich and Riedel, Ralf (2004):
Monoclinic Zirconia Bodies by Thermoplastic Ceramic Extrusion.
In: Journal of the American Ceramic Society, Wiley, pp. 358-364, 87, (3), [Article]

Abstract

wo ultrafine, undoped ZrO2 powders with median primary particle sizes of 9 and 25 nm were used to prepare ceramic suspensions for thermoplastic extrusion. The organic vehicle consisted of an industrial-grade poly(ethylene-co-vinyl acetate) (EVA) or polyethylene (PE-HD) and decanoic acid as a dispersing agent. The powder volume loadings achieved were 44% and 52% by volume for the two powders, respectively. The amount of dispersant needed was calculated from a new model based on available chemisorption sites on the powder surface. Mixing and extrusion were conducted using a conventional modular plastic processing unit. Green bodies were dewaxed up to 450°C in an inert atmosphere and sintered to full density in air at 1060° and 1100°C, respectively. Analysis of the ceramic phase content and the microstructure of the bodies is presented.

Item Type: Article
Erschienen: 2004
Creators: Scheying, Gerd and Wührl, Ingrid and Eisele, Ulrich and Riedel, Ralf
Title: Monoclinic Zirconia Bodies by Thermoplastic Ceramic Extrusion
Language: English
Abstract:

wo ultrafine, undoped ZrO2 powders with median primary particle sizes of 9 and 25 nm were used to prepare ceramic suspensions for thermoplastic extrusion. The organic vehicle consisted of an industrial-grade poly(ethylene-co-vinyl acetate) (EVA) or polyethylene (PE-HD) and decanoic acid as a dispersing agent. The powder volume loadings achieved were 44% and 52% by volume for the two powders, respectively. The amount of dispersant needed was calculated from a new model based on available chemisorption sites on the powder surface. Mixing and extrusion were conducted using a conventional modular plastic processing unit. Green bodies were dewaxed up to 450°C in an inert atmosphere and sintered to full density in air at 1060° and 1100°C, respectively. Analysis of the ceramic phase content and the microstructure of the bodies is presented.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 87
Number: 3
Publisher: Wiley
Uncontrolled Keywords: zirconia, extrusion
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 23 Apr 2012 08:28
Funders: Supported by German Federal Grant (BMBf) under Grant No. 03M2744A5.
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