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Hot isostatic pressing of tetragonal ZrO2solid-solution powders prepared from acetylacetonates in the system ZrO2-Y2O3-Al2O3

✍ Scribed by H. Watanabe; K. Hirota; O. Yamaguchi; S. Inamura; H. Miyamoto; N. Shiokawa; K. Tsuji

Publisher
Springer
Year
1994
Tongue
English
Weight
814 KB
Volume
29
Category
Article
ISSN
0022-2461

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✦ Synopsis

In compositions having ZrO2/Y203 = (74.25-71.25)/(0.75-3.75) (mol % ratio) with 25 mol % AI203, metastable t-Zr02 solid solutions crystallize at ~ 780 ~ to ~ 860 ~ from amorphous materials prepared by the simultaneous hydrolysis of zirconium, yttrium and aluminium acetylacetonates. Hot isostatic pressing has been performed for 1 h at 1130 and 1230 ~ under 196 MPa using their powders. Two kinds of material are fabricated: (i) perfect Zr02 solidsolution ceramics and (ii) composites of Zr02 solid solution and 0~-AI203. Their mechanical properties are examined, in connection with microstructures and t/m ZrO 2 ratios. Composites with a homogeneous dispersed 0~-AI203 derived from solid-solution ceramics result in a remarkable increase of strength.

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