MORPHOLOGY AND COMPOSITION CHANGES DURING PREPARATION OF Al<sub>2</sub>O<sub>3</sub> POWDERS BY SPRAY PYROLYSIS OF AMMONIUM ALUM

LIU Shiquan; SONG Guangzhi; YANG Zhongxi; WANG Jianrong; DAI Huisheng

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MORPHOLOGY AND COMPOSITION CHANGES DURING PREPARATION OF Al₂O₃ POWDERS BY SPRAY PYROLYSIS OF AMMONIUM ALUM

更新时间：2025-12-10

- MORPHOLOGY AND COMPOSITION CHANGES DURING PREPARATION OF Al₂O₃ POWDERS BY SPRAY PYROLYSIS OF AMMONIUM ALUM
- CIESC Journal Issue 7, (2002)
- 作者机构：
  
  1. 山东大学晶体材料研究所
  2. 中国科学院理化技术研究所
  3. 山东建材工业学院材料系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 July 2002，
  
  Published：25 July 2002
- 稿件说明：
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LIU Shiquan, SONG Guangzhi, YANG Zhongxi, et al. MORPHOLOGY AND COMPOSITION CHANGES DURING PREPARATION OF Al₂O₃ POWDERS BY SPRAY PYROLYSIS OF AMMONIUM ALUM[J]. CIESC Journal, 2002, (7).
DOI：

LIU Shiquan, SONG Guangzhi, YANG Zhongxi, et al. MORPHOLOGY AND COMPOSITION CHANGES DURING PREPARATION OF Al₂O₃ POWDERS BY SPRAY PYROLYSIS OF AMMONIUM ALUM[J]. CIESC Journal, 2002, (7). DOI：

摘要

以铵矾为原料

采用喷雾干燥结合煅烧热解工艺制得粒径 (d50 )为 5 .82 μm的球形度良好的Al2 O3 微粉 .利用DTA -TG、XRD、SEM及能谱分析研究了喷雾、干燥、热解 3个阶段所得粉体的形貌及组成的变化过程 .喷雾干燥制备的粉体

经进一步烘干、煅烧后

发生脱水、颗粒分离、热解和收缩

粒径不断减小 .煅烧热解所得Al2 O3 微粉的晶型取决于热解温度和时间

1370℃煅烧 2h可获得结晶度良好的球形α -Al2 O3 微粉

Abstract

Globular Al 2O 3 powders with diameter ( d 50 ) of 5.82μm were prepared by spray-drying the solution of ammonium alum combined with pyrolysis process.SEM

XRD

DTA-TG

and Energy Spectrum were used to analyze the morphology and composition changes of powders obtained at different preparation stages.The results showed that the particles prepared by spray-drying were relatively coherent

then were dried

separated

dehydrated and shrunk after drying and pyrolysis processes.As a result

the diameter of powders decreased gradually

and the proportion of bigger particles significantly decreased.The sequence of the phase transition of ammonium alum was found to be NH 4Al(SO 4) 2·12H 2O→NH 4Al(SO 4) 2→Al 2(SO 4) 3→ θ -Al 2O 3→ α -Al 2O 3 according to DTA-TG and XRD results.Sintered at 1370℃ for 2h

α -Al 2O 3 powders of high purity was obtained.

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MORPHOLOGY AND COMPOSITION CHANGES DURING PREPARATION OF Al2O3 POWDERS BY SPRAY PYROLYSIS OF AMMONIUM ALUM

DOI：

摘要

Abstract

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Keywords

references

MORPHOLOGY AND COMPOSITION CHANGES DURING PREPARATION OF Al₂O₃ POWDERS BY SPRAY PYROLYSIS OF AMMONIUM ALUM