Effects of ZrO<sub>2</sub> Ultrafine Particle Additive on the Formation of Al<sub>2</sub>O<sub>3</sub> from Sulfate
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- DAIMON Keiji
- Nagoya Institute of Technology
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- KATO Etsuro
- Nagoya Institute of Technology
Bibliographic Information
- Other Title
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- 硫酸塩からのアルミナの生成に及ぼすZaO<sub>2</sub>超微粒子の添加効果
- リュウサンエン カラ ノ アルミナ ノ セイセイ ニ オヨボス ZrO2 チョ
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Abstract
An aqueous solution of aluminum sulfate containing ultrafine ZrO2 particles was dehydrated at 300°C to prepare the starting material of ZrO2-Al2O3 composite. The effects of ZrO2 additive on the decomposition of anhydrous sulfate into η-Al2O3, on the η→α phase transformation and on the sinterability of produced ZrO2-Al2O3 composite powder were studied. The apparent crystallite size of the anhydrous sulfate decreased with increasing ZrO2 content from 42nm (no additive) to 18nm (20vol% ZrO2). The composite oxide powder, in which aggregated particle (50-100nm in diameter) of tetragonal ZrO2 dispersed in the secondary grains of η-Al2O3, was obtained by decomposing the anhydrous sulfate. In the composite powder containing 20vol% ZrO2, α-Al2O3 was found above 1100°C, while it formed above 1200°C for the single component Al2O3 powder. The grain growth of Al2O3 was prevented by ZrO2 particles dispersed in the η-Al2O3 grains; that is, the primary particle size of Al2O3 decreased with increasing ZrO2 content from 120nm (no additive) to 60nm (20vol% ZrO2) after calcination at 1250°C for 1h. The composite powders had very low green densities and they were difficult to sinter. But ball-milling of the composite powders yielded high densities up to 94% for 10vol% ZrO2 bodies fired at 1600°C for 1h in air. The ZrO2 particles were located at the boundary of Al2O3, and the grain size of Al2O3 decreased from 3.0μm (no additive) to 1.2μm (10vol% ZrO2) as the content of ZrO2 increased.
Journal
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- Journal of the Ceramic Association, Japan
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Journal of the Ceramic Association, Japan 95 (1100), 412-417, 1987
The Ceramic Society of Japan
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Details 詳細情報について
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- CRID
- 1390001205248721664
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- NII Article ID
- 110002313615
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- NII Book ID
- AN00245650
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- ISSN
- 18842127
- 00090255
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- NDL BIB ID
- 3131985
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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