氢氧化铝制备α-Al_(2)O_(3)微观结构分析  

Microstructure analysis ofα-Al_(2)O_(3) prepared by aluminum hydroxide

作　　者：康冬冬 冯雨 韩露[2] 鲁志燕 唐兵 崔娟 吴锋 Kang Dongdong;Feng Yu;Han Lu;Lu Zhiyan;Tang Bing;Cui Juan;Wu Feng(不详;Yunnan Punai Kungang High Temperature Materials Co.,Ltd.,Kunming 650000,Yunnan,China)

机构地区：[1]云南濮耐昆钢高温材料有限公司,云南昆明650000 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《耐火材料》2022年第3期218-221,共4页Refractories

基　　金：国家自然科学基金项目(51504133)。

摘　　要：为研究氢氧化铝制备α-Al_(2)O_(3)过程中的相转变和微观结构的变化,以氢氧化铝为原料,研究了不同煅烧温度(500、800、900、1100、1200、1300℃)下氢氧化铝的相变过程和显微结构的变化。结果表明:1)在500℃时,一部分三水铝石脱除结晶水转化为一水软铝石;500~800℃时,三水铝石和一水软铝石继续脱除结晶水转化为氧化铝过渡相。2)在800~1200℃时,氧化铝过渡相之间进行相转变;1300℃时,过渡相全部转化为α-Al_(2)O_(3)。3)煅烧温度为800℃时生成的γ-Al_(2)O_(3)和η-Al_(2)O_(3)比表面积最大,活性最高,为催化剂载体和提高电池循环寿命提供了新途径。Adopting aluminum hydroxide as the raw material to prepareα-Al_(2)O_(3),the phase transformation process and microstructure changes of aluminum hydroxide at different calcination temperatures(500,800,900,1100,1200,and 1300℃)were studied.The results show that:(1)at 500℃,a part of gibbsite loses crystal water and transforms into boehmite;at 500-800℃,gibbsite and boehmite continue to lose crystal water and convert into alumina transition phases;(2)at 800-1200℃,phase transformation occurs between alumina transition phases;at 1300℃,all transition phases transform intoα-Al_(2)O_(3);(3)when the calcination temperature is 800℃,the specific surface area ofγ-Al_(2)O_(3)toη-Al_(2)O_(3)is the largest and the activity is the highest,which provides a new way for the catalyst support and the improvement of the cycle life of the battery.

关 键 词：氢氧化铝 三水铝石 一水软铝石 氧化铝 

分 类 号：TQ175[化学工程—硅酸盐工业]