電気伝導度測定による二成分系成形体の微構造解析(第2報)
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概要
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Particle connection in two-component powder compact was quantitatively evaluated by electrical conductivity measurement. As a model system, an Al_2O_3 powder (median size 0.33μm or 0.51μm, insulator) was mixed with an indium tin oxide powder (ITO, 90 mass% In_2O_3-10 mass% SnO_2, median size 0.20μm, electronic conductor) in aqueous solutions with and without polyacrylic acid (dispersant) at pH 3.3-10.0. The packing density of the powder compacts consolidated by filtration depended on the pH of the suspension, the size of Al_2O_3 particles and the volume fraction of ITO. The above green density was well simulated using the fractional collision frequency and packing density of Al_2O_3-Al_2O_3, Al_2O_3-ITO and ITO-ITO clusters in the powder compact. A continuous connection of ITO particles in the consolidated green compact formed at 25 vol% ITO fraction in both the powder compacts with 0.33μm-and 0.51μm-Al_2O_3 median size, respectively. On the other hand, particle connection of ITO-ITO formed at 95% relative density for 20 vol% ITO fraction after the sintering at 1400℃. At 10 vol% ITO fraction, no ITO-ITO connection was formed in the dense compact with a relative density above 95%. The conduction path in the green and sintered compacts was formed at Df=0.15 (D: relative density of the compact, f: ITO volume fraction), which corresponded to 0.66cm of the critical length of connecting ITO particles in a 1cm-cube of the compact. It is possible to interpret that one string of connecting ITO particles is in contact three-dimensionally with another string to make the conduction path.
- 社団法人日本セラミックス協会の論文
- 2005-08-01
著者
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平田 好洋
鹿児島大学工学部応用化学工学科
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鮫島 宗一郎
鹿児島大学工学部応用化学工学科
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平田 好洋
鹿児島大学大学院理工学研究科ナノ構造先端材料工学専攻
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平田 好洋
鹿児島大学大学院理工学研究科
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鮫島 宗一郎
Department of Advanced Nanostructured Materials Science and Technology, Kagoshima University
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是枝 有紀
鹿児島大学大学院理工学研究ナノ構造先端材料工学専攻
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鮫島 宗一郎
Department Of Advanced Nanostructured Materials Science And Technology Kagoshima University
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鮫島 宗―郎
鹿児島大学工学部応用化学工学科
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Hirata Yoshihiro
Department Of Advanced Nanostructured Materials Science And Technology Kagoshima University
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平田 好洋
鹿児島大学大学院 理工学研究科化学生命・化学工学専攻
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平田 好洋
鹿児島大学大学院
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