本實驗是以硫酸鋁銨和硝酸鋁為鋁塩，分別與沉澱劑碳酸氫銨利用沉澱法製備奈米粒子碳酸氫氧鋁銨AACH粒子，在經由煅燒後會生成α相奈米氧化鋁粉末。研究利用鋁塩的改變、鋁塩和沉澱劑莫耳比的改變、晶種有或無的條件改變、煅燒溫度的改變，提供純度高且粒徑小的奈米氧化鋁粉末之製備方法。我們研究發現硫酸鋁銨與碳酸氫銨以莫耳比1:8製備的AACH球形粒子較小，粒徑在13~17nm; 兩種鋁塩製備的AACH都可在400℃煅燒成α相奈米氧化鋁粉末。而最小粒徑的α相氧化鋁，是由硝酸鋁與碳酸氫銨以莫耳比1:10製備的22~25nm AACH粒子，在有晶種的條件下，以700℃煅燒50分鐘，可以製得38nm球形奈米氧化鋁粉末。

Synthesis of nano α-aluminum oxide powder after calcinations was studied by defining aluminum salt as aluminum ammonium sulfate and aluminum nitrate , using precipitating agent ammonium hydrogen carbonate was studied in this work。
Effects of processing variables such as aluminum salt , Molar ratio (aluminum salt and precipitating agent ) , present or absent crystal seeds , calcinative temperature were investigated。
The results of the precipitation Method indicated that ammonium aluminum carbonate hydroxide (AACH) sopheral particle synthesized using aluminum ammonium sulfate and ammonium hydrogen carbonate in 1:8 molar ratio was smaller , 13 to 17 nm ; AACH of both the two synthesizing processes can be calcined to nano α-aluminum oxide powder at 400℃。
As indicated by the results, the tinest sopheral α-aluminum oxide powder with an averaged grain size , 38nm ,can be obtained by the process of calcinating the 22 to 25 nm AACH(prepared by aluminum nitrate and ammonium hydrogen carbonate in 1:10 molar ratio) at 700℃ for 50 minutes under the present of α-alumina crystal seeds。

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