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Hot Extrusion of Ceramics
Author(s) -
Wu Xin,
Chen IWei
Publication year - 1992
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.1151-2916.1992.tb07206.x
Subject(s) - extrusion , materials science , ceramic , composite material , texture (cosmology) , grain size , mineralogy , analytical chemistry (journal) , chemistry , image (mathematics) , artificial intelligence , computer science , chromatography
Two dense ceramics, Bi 2 Sr 2 CaCu 2 O 8+ X and 2Y‐TZP: 10 wt% Al 2 O 3 , were hot‐extruded through conical dies under a wide range of conditions. Extrusion of Bi 2 Sr 2 CaCu 2 O 8+ X was performed at 775° to 825°C and speeds of 0.0005 to 0.2 mm/s, with the die semi‐angles from 30° to 60° and extrusion ratios from 4 to 9. Extrusion of 2Y‐TZP:10 wt% Al 2 O 3 was performed at 1650°C and 0.017 mm/s. During hot extrusion of Bi 2 Sr 2 CaCu 2 O 8+ X , a strong texture was developed with the basal plane aligned along the extrusion direction, whereas the zirconia/alumina composite underwent grain growth which resulted in strain hardening. A simple analytical extrusion model for strain‐rate‐sensitive materials has been developed using a combined slab method and upper‐bound method and a power‐law material flow equation. The model predictions are in good agreement with the experimental results and they further serve to delineate the limitation of the extrusion technique for ceramic applications.