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Transformation Toughening in Sol–Gel‐Derived Alumina‐Zirconia Composites
Author(s) -
Srdi Vladimir V.,
Radonji Ljiljana
Publication year - 1997
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.1151-2916.1997.tb03089.x
Subject(s) - materials science , cubic zirconia , toughening , tetragonal crystal system , composite material , monoclinic crystal system , zirconium , toughness , phase (matter) , microstructure , particle size , intergranular corrosion , chemical engineering , ceramic , metallurgy , crystal structure , crystallography , chemistry , organic chemistry , engineering
The microstructures of α‐Al 2 O 3 seeded sol–gel‐derived alumina‐zirconia composites containing 20 wt% unstabilized zirconia (processed from zirconium n‐propoxide) were very fine, with submicrometer alumina grains and small, mainly intergranular zirconia particles, the latter having a critical size for the tetragonal‐to‐monoclinic phase transformation of 0.45 μm. The corresponding ratios of the toughening contribution to the matrix toughness are relatively low (δK c /K 0 <1). This finding is confirmed by an analysis of the tetragonal zirconia particle size dependence of the stress‐induced transformation toughening.