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Zirconia Particle Coarsening and the Effects of Zirconia Additions on the Mechanical Properties of Certain Commercial Aluminas
Author(s) -
WITEK S. R.,
BUTLER E. P.
Publication year - 1986
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.1151-2916.1986.tb04787.x
Subject(s) - materials science , intergranular corrosion , cubic zirconia , microstructure , toughening , ceramic , particle size , toughness , particle (ecology) , composite material , morphology (biology) , kinetics , chemical engineering , oceanography , biology , engineering , genetics , geology , physics , quantum mechanics
The effects of ZrO 2 additions on the mechanical properties of four commercial aluminas have been studied, and the changes in intergranular and intragranular ZrO 2 particle sizes during aging have been determined for one of the aluminas. In this ceramic, the intercranular and intragranular ZrO 2 particles coarsen obeying t 1/2 and t 1/3 kinetics, respectively. Changes in strength of the aluminas with additions of ZrO 2 are shown to be related to changes in the Al 2 O 3 matrix microstructure. Differences in toughness of the resulting composites are explained in terms of the different size and morphology of the intergranular ZrO 2 particles and the operation of several toughening mechanisms, with transformation toughening a relatively minor contributor.