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Sinter‐Forging Characteristics of fine‐Grained Zirconia
Author(s) -
Panda Prakash C.,
Wang Jenqdaw,
Raj Rishi
Publication year - 1988
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.1151-2916.1988.tb05820.x
Subject(s) - materials science , strain rate , composite material , silicon nitride , cubic zirconia , yttria stabilized zirconia , compression (physics) , shear stress , hydrostatic pressure , stress (linguistics) , forging , shear (geology) , ceramic , metallurgy , linguistics , philosophy , physics , layer (electronics) , thermodynamics
Powder preforms of zirconia, containing 2.85 mol% yttria, were sinter‐forged in simple uniaxial compression at 1400°C by applying constant displacement rates to the specimens. Shear and densification strains and the uniaxial stress were measured as a function of time. In contrast with alumina and silicon nitride, zirconia appears to densify by a dislocation mechanism. As a consequence, the densification rate is linked to the applied strain rather than to the applied hydrostatic pressure; the powder compact requires a critical amount of compressive strain to consolidate to full density, irrespective of the strain rate or the stress at which that strain is applied.