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High‐Temperature Creep of Y 2 O 3 ‐Stabilized ZrO 2
Author(s) -
SELTZER M. S.,
TALTY P. K.
Publication year - 1975
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.1151-2916.1975.tb19574.x
Subject(s) - creep , materials science , grain size , porosity , impurity , stress (linguistics) , yttria stabilized zirconia , composite material , atmospheric temperature range , activation energy , mineralogy , cubic zirconia , thermodynamics , chemistry , ceramic , linguistics , philosophy , physics , organic chemistry
The compression creep behavior of Y 2 O 3 ‐stabilized ZrO 2 (YSZ) was studied at temperatures to 2000 ° C. The function of Y 2 O 3 content and grain size was tested in specimens with various impurity concentrations and porosity distributions. For relatively fine‐grained specimens, creep rates increased with the 1.5 power of the applied stress at low stresses and with the third power at high stresses. The results for coarse‐grained specimens can, in general, be fit by the cube dependence. The 1.5 power can be reduced to a linear dependence by correcting for an apparent threshold stress, which decreases with increasing temperature. Creep activation energies for YSZ are 128 ± 10 kcal/mol, independent of Y 2 O 3 content, impurity level, grain size, and porosity distribution. In addition, over a broad range of temperatures and stresses the absolute values of the steady‐state creep rates are influenced only by grain size and O 2 partial pressure.