Formation and Sintering of Zirconia(3mol% Yttria)--Toughened Alumina Powders Prepared by the Hydrazine Method (粉末プロセスの制御と製品の評価<特集>)
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概要
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Alumina/3 mol% yttria-doped zirconia composite powders have been prepared by the hydrazine method. As-prepared powders are AIO(OH) gel solid solutions and the mixtures of this and amorphous ZrO<SUB>2</SUB> below and above 10 mol% ZrO<SUB>2</SUB>, respectively. Formation process leading to α-Al<SUB>2</SUB>O<SUB>3</SUB>-t-ZrO<SUB>2</SUB> composite powders is examined. Hot isostatic pressing has been performed for 1 h at 1500°C under 196 MPa using the composite powders of α-Al<SUB>2</SUB>O<SUB>3</SUB> and t ZrO<SUB>2</SUB> obtained by heating for 1 h at 1350°C. The resulting dense ZrO<SUB>2</SUB>-toughened Al<SUB>2</SUB>O<SUB>3</SUB> (ZTA) ceramics with 30 mol% ZrO<SUB>2</SUB> show excellent mechanical strength (1100 MPa). The grain sizes of α-Al<SUB>2</SUB>O<SUB>3</SUB> and intergranular ZrO<SUB>2</SUB> in ZTA decrease with increased ZrO<SUB>2</SUB> addition. Intragranular ZrO<SUB>2</SUB> grains are 0.3 μm regardless of the starting composition. Mechanical properties are discussed in connection with relative densities and microstructures.
- 社団法人 粉体粉末冶金協会の論文
著者
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HIROTA Ken
Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University
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Hirota Ken
Department Of
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Yamaguchi Osamu
Department Of Agricultural Sciences Faculty Of Agriculture Okayama University
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Inamura Suguru
Osaka Prefectural Institute of Industrial Technology
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Miyamoto Hiroki
Osaka Prefectural Institute of Industrial Technology
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Yamakata Koji
Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University
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Kume Hideki
Osaka Prefectural Institute of Industrial Technology
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Yamaguchi Osamu
Deparment of Applied Chemistry, Faculty of Engineering, Doshisha University
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