Abstract
In order to determine the effect of the coarse tail of the ZrO2 size distribution of the monoclinic ZrO2 content of zirconia‐toughened alumina, quantitative hot‐stage X‐ray measurements were made on (1) A12O3‐10% Zr02 (submicrometer with a coarse tail >1 μm), (2) A12O3‐10% ZrO2 with the coarse tail of the ZrO2 carefully removed by centrifugation, and (3) Al2O3‐10% ZrO2 in which 10% of Zr02(1) and 90% of Zr02(2) were used. The monoclinic content of (3) was compared with the weighted average of(1) and (2). A disproportionate amount of monoclinic ZrO2 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.
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