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Initial Sintering Mechanism of Fine Zirconia Particles Including a Small Amount of Alumina
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- MATSUI Koji
- Synthetic Chemicals Production, Tosoh Corporation
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- OHMICHI Nobukatsu
- Synthetic Chemicals Production, Tosoh Corporation
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- OHGAI Michiharu
- Synthetic Chemicals Production, Tosoh Corporation
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- YAMAKAWA Takanori
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University
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- UEHARA Masato
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University
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- ENOMOTO Naoya
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University
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- HOJO Junichi
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University
Description
The sinterabilities of fine zirconia powders including 5 mass% Y2O3 were investigated with emphasis on the effect of Al2O3 addition on densification at the initial stage. The powders were pressed into disks and sintered at 1100-1500°C in air. When a small amount of Al2O3 was added, high-density sintered bodies were obtained at a low temperature. The shrinkage of powder compact in the course of heating was measured by a dilatometric method, indicating that the addition of Al2O3 increased the densification rate with elevating temperature. The activation energies of sintering were determined by analyzing the densification curves. The activation energy at the initial stage of sintering decreased by Al2O3 addition. The analysis of isothermal shrinkage curves exhibited that the diffusion mechanism changed from grain-boundary to volume diffusions by addition of Al2O3. It is concluded that the Al2O3 addition enhanced the densification because of decreasing the activation energy of volume diffusion at the initial stage of sintering.
Journal
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- Journal of the Ceramic Society of Japan, Supplement
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Journal of the Ceramic Society of Japan, Supplement 112 (0), S343-S349, 2004
The Ceramic Society of Japan
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Details 詳細情報について
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- CRID
- 1390282680499895680
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- NII Article ID
- 130004610198
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- ISSN
- 13492756
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- Text Lang
- en
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed