Elongational flow processing of ceramics

Citation
Jrg. Evans et J. Greener, Elongational flow processing of ceramics, J MATER PR, 96(1-3), 1999, pp. 143-150
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
ISSN journal
0924-0136 → ACNP
Volume
96
Issue
1-3
Year of publication
1999
Pages
143 - 150
Database
ISI
SICI code
0924-0136(19991101)96:1-3<143:EFPOC>2.0.ZU;2-F
Abstract
Extrusion and injection moulding are well-established procedures for shapin g ceramics and they rely principally on the shear flow of crowded (50-60 vo l%) suspensions of powder in molten waxes or polymers. Recently a number of simpler shaping operations have become available in which it is the elonga tional flow of such suspensions which confers shape. These have emerged aga inst the prevailing expectation that crowded suspensions could not sustain high elongational strains and the intuitive belief that where thermoplastic polymers are used, the shape would collapse on subsequent reheating to exp el the organic vehicle. This review describes some of the processes, namely , vacuum forming, blow moulding, film blowing, melt spinning, the formation of flanges and the manufacture of foams. The manufacturing operation is co mpleted, in each case, by removing the organic vehicle and sintering the po wder assembly. (C) 1999 Published by Elsevier Science S.A. All rights reser ved.