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High‐Temperature Extrusion Behavior of a Superplastic Zirconia‐Based Ceramic
Author(s) -
Kellett Bruce J.,
Carry Claude,
Mocellin Alain
Publication year - 1990
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.1151-2916.1990.tb05246.x
Subject(s) - materials science , extrusion , superplasticity , composite material , piston (optics) , ceramic , graphite , die (integrated circuit) , lubricant , metallurgy , microstructure , physics , wavefront , optics , nanotechnology
Workability of 3‐mol%‐yttria‐stabilized tetragonal ZrO 2 has been gauged through a series of extrusion experiments performed under vacuum with graphite dies at 1500°C and 35 MPa piston stress. It is shown that dense and smooth extrusions can be obtained from solid billets when graphite paper is used as a lubricant. Sigmoidal dies and conical dies with cone angles of 18.4°, 26.6°, and 45° and diameter ratios of 1.5, 2, and 3 were used to explore extrusion behavior. Observed piston velocities correspond to what may be predicted from the experimental uniaxial constitutive creep equation and a simple slab analysis. A precise analysis, however, is not attempted because of lack of steady‐state behavior of the material itself.