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Preparation of acicular particles of α-alumina

  • Takeo Iga (a1) and Yoshio Murase (a1)

Abstract

Aluminum ammonium sulfate (AA) solution (0.1 mol/l) and ammonium hydrogen carbonate (AHC) solution (1.2 mol/l) were allowed to react at room temperature. The precipitates formed were kept with the mother liquor in a closed vessel and aged at 100 °C. Acicular-shaped crystalline particles of Al(NH4)CO3(OH)2, (AACH), were obtained after the elongated aging period. Acicular α-alumina particles were obtained through the thermal decomposition at 1300 °C out of the AACH particles which were previously treated with a small amount of tetraethoxysilane (about 1.6 wt. % of SiO2).

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1Kato, S., Iga, T., Hatano, S., and Izawa, Y., Yogyo-Kyokai-Shi (J. Ceram. Soc. Jpn.) 84, 215 (1976).
2Iga, T. and Izawa, Y., Transactions of the Materials Research Society of Japan 11 (The Materials Research Society of Japan, Japan, 1992), p. 33.
3Murase, Y. and Iga, T., Yogyo-Kyokai-Shi (J. Ceram. Soc. Jpn.) 95, 556 (1987).
4Iga, T. and Kato, S., Yogyo-Kyokai-Shi (J. Ceram. Soc. Jpn.) 86, 509 (1978).
5Japan Kokai Tokkyo Koho, 48–83100 (1973); Ger. Offen., 2,202,853 (1973).

Preparation of acicular particles of α-alumina

  • Takeo Iga (a1) and Yoshio Murase (a1)

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