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| Ivan J., Besterci M., Zbíral J., Edtmaier Ch., Šlesár M. |
| STATISTICAL DISTRIBUTION OF Y2O3 PARTICLE SIZE IN THE SYSTEM PT-Y2O3 BY MEANS OF THE STEM METHOD |
Abstract
In the work, the statistical distribution of Y2O3 particle size in the system Pt- Y2O3 is evaluated by STEM method. Mentioned materials were prepared by two-stage reduction of Pt, low-energy mechanical alloying, densed by HIP and more stage rolling.
It was shown that there are particles of two size categories in Pt matrix. They are: large particles, clusters, and ZrO2 inclusions with the size of 1.1 - 12 ?m, which represent 0.7 % of nominal volume fraction. The second part is of the effective disperse Y2O3 particles with the size of 0.09 - 1.1 ?m, the volume fraction of which was 0.3 % of the nominal one. Thin foils were evaluated by the SEM method in the scope of statistical particle size distribution by use of Waddeľs parameters. Selective electron diffraction was used to identify the phases Y2O3 [( 200), (511), (513)] and Pt [(200), (020), (220)].
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| No 1 (1999), p. 12-15 |
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