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Ceramics International 17 (1991)267-274 Molecular and Colloidal Engineering of

Summary: Ceramics International 17 (1991)267-274
Molecular and Colloidal Engineering of
Ilhan A. Aksay
Department of Materials Science and Engineering and Advanced Materials Technology Center,
Washington Technology Center, University of Washington, Seattle, Washington 98195, USA
(Received 24 June 1990; accepted 10 September 1990)
Abstract: During the last decade, significant advances have been made in the
processing of ceramics by a combination of techniques utilizing molecular
precursors and colloids for powder consolidation. Powder consolidation methods
have mainly dealt with the formation of unagglomerated powders in the size range
of 0'1-1 #m, the preparation of colloidal suspensions that are suitable for the
formation of high density compacts by filtration and/or plastic formingtechniques,
the removal of the processing aids, and the role of consolidation methods on
microstructural evolution. In contrast, the molecular and/or sol-gel techniques
dealt with processing at a finer dimensional scale of 10-1000/~, with either
molecularly homogeneousprecursors or nanometer-sized particulates that are used
in the preparation of gels that display linear viscoelastic behavior. Similar to green
compacts of micron-sized powders, these gels are then converted to dense ceramics
by heat treatment. This reviewsummarizes the concepts that are common to both of


Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University


Collections: Materials Science