Fabrication of fine α-alumina powders by thermal decomposition of ammonium aluminum carbonate hydroxide (AACH)

K. Morinaga, T. Torikai, K. Nakagawa, S. Fujino

    研究成果: ジャーナルへの寄稿学術誌査読

    79 被引用数 (Scopus)

    抄録

    In this paper, the phase transformations that occur during the thermal decomposition of ammonium aluminum carbonate hydroxide (AACH) into α-Al2O3 have been studied. Amorphous, γ-, and θ-Al2O3 were identified as intermediate products. A time-temperature-transformation (TTT) diagram for thermal decomposition in air was determined. The critical particle size of θ-Al2O3 in the θ→α phase transformation is approximately 30 nm; the size does not depend on the firing atmosphere. However, the atmosphere affects the grain size distribution of the final α-Al2O3 particles. Powders with an average grain size of 60 nm were obtained by firing in vacuum or hydrogen.

    本文言語英語
    ページ(範囲)4735-4741
    ページ数7
    ジャーナルActa Materialia
    48
    18-19
    DOI
    出版ステータス出版済み - 12月 1 2000

    !!!All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • セラミックおよび複合材料
    • ポリマーおよびプラスチック
    • 金属および合金

    フィンガープリント

    「Fabrication of fine α-alumina powders by thermal decomposition of ammonium aluminum carbonate hydroxide (AACH)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル