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Monoclinic Zirconia Bodies by Thermoplastic Ceramic Extrusion
Author(s) -
Scheying Gerd,
Wührl Ingrid,
Eisele Ulrich,
Riedel Ralf
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00358.x
Subject(s) - materials science , extrusion , ceramic , dispersant , composite material , thermoplastic , cubic zirconia , ethylene vinyl acetate , polyethylene , chemical engineering , polymer , dispersion (optics) , physics , optics , engineering , copolymer
Two ultrafine, undoped ZrO 2 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.