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Preparing Ultrafine Alumina Powder by AACH Thermal Decomposition

Fangyang Liu

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Abstract

Ammonium aluminum carbonate hydroxide(AACH) was synthesized as the precursor by the precipitation reaction of aluminum sulfate and ammonium carbonate.Then the precursor was agglomerated to get Al_2O_3 powder.The thermal decomposition reaction of the precursor was confirmed by analyzing the DTA/TGA curves.The DTA/TGA curves and XRD shown that the phase transformation of AACH in sintering process was: AACH→AlOOH→amorphous Al_2O_3→γ-Al_2O_3→θ-Al_2O_3→α-Al_2O_3.And the effect of drying method on the dispersity of ultrafine alumina was also discussed in this paper.

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What this paper is about

Ammonium aluminum carbonate hydroxide(AACH) was synthesized as the precursor by the precipitation reaction of aluminum sulfate and ammonium carbonate.Then the precursor was agglomerated to get Al_2O_3 powder.The thermal decomposition reaction of the precursor was confirmed by analyzing the DTA/TGA curves.The DTA/TGA curves and XRD shown that the phase transformation of AACH in sintering process was: AACH→AlOOH→amorphous Al_2O_3→γ-Al_2O_3→θ-Al_2O_3→α-Al_2O_3.And the effect of drying method on the dispersity of ultrafine alumina was also discussed in this paper.

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Available abstract

Ammonium aluminum carbonate hydroxide(AACH) was synthesized as the precursor by the precipitation reaction of aluminum sulfate and ammonium carbonate.Then the precursor was agglomerated to get Al_2O_3 powder.The thermal decomposition reaction of the precursor was confirmed by analyzing the DTA/TGA curves.The DTA/TGA curves and XRD shown that the phase transformation of AACH in sintering process was: AACH→AlOOH→amorphous Al_2O_3→γ-Al_2O_3→θ-Al_2O_3→α-Al_2O_3.And the effect of drying method on the dispersity of ultrafine alumina was also discussed in this paper.

Key concepts: Hydroxide, Thermal decomposition, Dispersity, Materials science, Decomposition, Sintering, Ammonium hydroxide, Chemical engineering

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