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Strength Improvement of Yttria‐Partially‐Stabilized Zirconia by Flaw Elimination
Author(s) -
SUNG JASON,
NICHOLSON PATRICK S.
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.tb06415.x
Subject(s) - flexural strength , materials science , yttria stabilized zirconia , cubic zirconia , slip (aerodynamics) , composite material , fracture (geology) , sintering , ceramic , physics , thermodynamics
A systematic improvement of the flexural strength of conventionally sintered 4.5‐wt%‐Y 2 O 3 ‐partially‐stabilized zirconia was realized by identifying the fracture origins of four‐point‐bend bars and eliminating them by process modification. The average flexural strength increased from 880 to 1380 MPa, a value comparable with that of isostatically hot‐pressed or slip‐cast material. A part‐through crack extension model was used to correlate the fracture stresses and the fracture origin sizes and a “fracture origin severity parameter” was identified.