基于KCl-NaCl-K_(2)SO_(4)三元熔盐低温制备片状氧化铝  

The Preparation of Platelet Alumina Based on KCl-NaCl-K_(2)SO_(4)Ternary Molten Salts at Low Temperature

作　　者：周小丽 徐敬尧 ZHOU Xiao-li;XU Jing-yao(College of Chemistry and Environmental Engineering,Baise University,Baise 533000,China;School of Materials Science and Engineering,Baise University,Baise 533000,China;College of Ecological Aluminum Industry,Baise University,Baise 533000,China;Engineering Research Center of Advanced Aluminum Matrix Materials of Guangxi Zhuang Autonomous Region,Baise 533000,China)

机构地区：[1]百色学院化学与环境工程学院,百色533000 [2]百色学院材料科学与工程学院,百色533000 [3]百色学院生态铝产业学院,百色533000 [4]广西壮族自治区铝基新材料工程研究中心,百色533000

出　　处：《中国陶瓷》2024年第10期38-44,共7页China Ceramics

基　　金：2020年度广西高校中青年教师科研基础能力提升项目(2020KY19023);百色市科学研究与技术开发计划(百科20221464)。

摘　　要：以KCl、NaCl和K_(2)SO_(4)三元熔盐作为反应介质,AlF_(3)为添加剂,Al(OH)_(3)作为铝源,制备片状Al_(2)O_(3),并使用X射线衍射和扫描电子显微镜分别对制备的片状Al_(2)O_(3)的晶体构型和形貌进行了表征。分别研究了焙烧温度、AlF_(3)含量和焙烧时间对Al_(2)O_(3)形貌和晶体构型的影响,研究结果显示,当原料配比(质量比)w(KCl)∶w(NaCl)∶w(Na_(2)SO_(4))=1∶2∶2,AlF_(3)添加量为5 wt%(相对于Al(OH)_(3))时,在700℃煅烧240 min,即可获得分散性良好的、晶体构型为α型的片状Al_(2)O_(3),其平均径向尺寸约为5μm,平均厚度约为150 nm,径厚比约为33。The platelet alumina was prepared with the KCl-NaCl-K_(2)SO_(4)ternary molten salts system as reaction medium,AlF_(3) as additive and Al(OH)_(3) as an aluminum source.The crystal structure and morphology of the prepared platelet alumina were characterized by XRD and SEM,respectively.Furthermore,the influences of calcining temperature,AlF_(3) content and calcining time on morphology and crystal structure of the alumina were studied.The results showed that with a raw material ratio(mass ratio)of w(KCl)∶w(NaCl)∶w(Na_(2)SO_(4))=1∶2∶2,AlF_(3) addition of 5 wt%(relative to Al(OH)_(3)),calcination at 700℃for 240 minutes,and well-dispersedα-phase platelet alumina were obtained;meanwhile,their mean radial size and thickness were respectively about 5μm and 150 nm,and their diameter-thickness ratio reached about 33.

关 键 词：三元熔盐 片状氧化铝 低温 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]