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Particle Interactions in Zirconia‐Toughened Alumina
Author(s) -
Wilfinger Keith R.,
Can W. Roger
Publication year - 1989
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.1151-2916.1989.tb09720.x
Subject(s) - monoclinic crystal system , cubic zirconia , materials science , particle (ecology) , particle size , composite material , mineralogy , chemical engineering , crystallography , ceramic , chemistry , crystal structure , geology , oceanography , engineering
In order to determine the effect of the coarse tail of the ZrO 2 size distribution of the monoclinic ZrO 2 content of zirconia‐toughened alumina, quantitative hot‐stage X‐ray measurements were made on (1) A1 2 O 3 ‐10% Zr0 2 (submicrometer with a coarse tail >1 μm), (2) A1 2 O 3 ‐10% ZrO 2 with the coarse tail of the ZrO 2 carefully removed by centrifugation, and (3) Al 2 O 3 ‐10% ZrO 2 in which 10% of Zr0 2 (1) and 90% of Zr0 2 (2) were used. The monoclinic content of (3) was compared with the weighted average of(1) and (2). A disproportionate amount of monoclinic ZrO 2 was found in (3) and it was concluded that transformation of the coarse particles promotes transformation in finer particles. Microstructural examination supports this conclusion. Results were interpreted as being due both to autocatalytic transformation and to constraint relief from microcracking.