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- 佐藤 太一
- 静岡大学 Metallurgical Engineering Department, Queen's University, Canada
書誌事項
- タイトル別名
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- Preparation of Rho Alumina
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The crystalline aluminium hydroxides of hydrargillite-I (synonym of gibbsite) and II (H-I, II) and bayerite-I and II (B-I, II), in which I and II consist of the coarse and fine particles, respectively, were heated at 200-400°C under reduced pressure. The starting materials were checked up by electron microscopy and thermal analysis (TG and DTA), and then the resulting products were examined by x-ray diffraction study. Consequently, it was found that upon heating under reduced pressures at 0.667-6.67 Pa, amorphous alumina was formed from H-I and II bearing no relation to the heating rate at 1.25 or 5°C m-1, and similarly amorphous alumina was also formed from B-I and II at the rapid heating rate of 5°C m-1 ; while very poor crystalline alumina, which is regarded as the material corresponding to rho alumina (ρ-alumina) was obtained at the slow heating rate of 1.25°C m-1 from B-II, and a mixture of boehmite and ρ-alumina was obtained from B-I at the same heating rate.<BR>Accordingly it is seen that a ρ-alumina is prepared from the dehydration of bayerite which consist of fine particles by heating at 200-400°C at the slow rate under reduced pressure.
収録刊行物
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- 資源と素材
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資源と素材 120 (4/5), 197-201, 2004
一般社団法人 資源・素材学会
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詳細情報 詳細情報について
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- CRID
- 1390001206049991168
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- NII論文ID
- 10012934332
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- NII書誌ID
- AN10062646
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- ISSN
- 18806244
- 09161740
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- NDL書誌ID
- 6967263
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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