Microstructure control and superplastic property of zirconia dispersed alumina ceramics.
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- Sakka Yoshio
- National Research Institute for Metals
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- Suzuki Tohru S.
- National Research Institute for Metals
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- Nakano Keishi
- National Research Institute for Metals
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- Hiraga Keijiro
- National Research Institute for Metals
Bibliographic Information
- Other Title
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- ジルコニア添加アルミナ系セラミックスの微構造制御と超塑性特性
- ジルコニア テンカ アルミナケイ セラミックス ノ ビコウゾウ セイギョ ト
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Abstract
Superplasticity provides the possibility of high-temperature deformation processing of dense ceramics that has advantages of greater shape formability with better dimensional accuracy. To enhance the tensile ductility, microstructural design is required to get a fine grain size that is stable against coarsening during deformation at hightemperatures. Zirconia particle dispersed alumina is known to be effective in suppressing grain growth but the initial grain size of alumina reaches about 1μm using a conventional dry processing. In the present study, zirconia dispersed alumina composites were produced by colloidal process. Well-dispersed slurries consisting of α-Al2O3 and ZrO2 fine powders were prepared by adjusting the pH value or adding appropriate amounts of polyelectrolyte. The slurries were consolidated by slip casting, followed by isostatic pressing (CIP). The consolidated bodies have small pore size and narrow pore size distribution, which enabled sintering at low-temperature of 1400°C and resulted in the desired fine-grained microstructure. It is demonstrated that large tensile elongation exceeding 550% can be obtained for the colloidally processed samples owing to dense, fine-grained and homogeneous microstructure.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 45 (12), 1186-1195, 1998
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390282681284919552
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- NII Article ID
- 10002053464
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 4629457
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed