铝源和pH值对溶胶-凝胶法制备α-Al_(2)O_(3)粉体的影响  

Effect of aluminum sources and pH value on preparation ofα-Al_(2)O_(3) powders by sol-gel method

作　　者：高丽娜 韩兵强[1] 肖志兵 张锦化[1] 魏佳炜 鄢文[1] GAO Lina;HAN Bingqiang;XIAO Zhibing;ZHANG Jinhua;WEI Jiawei;YAN Wen(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Zhejiang Lansin Composite Material Technology Co.,Ltd,Huzhou 313000,China;College of Materials Science and Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]浙江兰欣复合材料科技有限公司,浙江湖州313000 [3]洛阳理工学院材料科学与工程学院,河南洛阳471023

出　　处：《武汉科技大学学报》2025年第1期25-33,共9页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金(U21A2058);武汉科技大学校企合作项目(2021H20052).

摘　　要：本文以硫酸铝、硝酸铝和氨水为原料,通过溶胶-凝胶法制备了形貌规则的α-Al_(2)O_(3)粉体。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、热重-差示扫描量热仪(TG-DSC)和傅里叶变换红外光谱仪(FTIR)系统地研究了不同铝盐质量比和溶液的pH值对氧化铝粉体物相组成、形貌和分散性的影响。结果表明,通过调节硝酸铝和硫酸铝的质量比可以改变α-Al_(2)O_(3)粉体的分散性和形貌。其中,硫酸根离子的加入使得氢氧化铝前驱体转变为勃姆石相,且制得的α-Al_(2)O_(3)粉体形貌规则。随着pH值的升高,前驱体物相由无定形氢氧化铝经勃姆石相转变为拜耳石相,且制得的α-Al_(2)O_(3)粉体团聚严重。当硝酸铝和硫酸铝的质量分数分别为75%和25%,溶液pH值为7时,前驱体在1200℃下加热2 h,能够制得分散性良好、形貌规则的α-Al_(2)O_(3)粉体。In this paper,α-Al_(2)O_(3) powder with regular morphology was prepared by the sol-gel method using aluminum sulfate,aluminum nitrate and ammonia water as raw materials.The effects of different mass ratios of aluminum salts and the pH value of the solution on the phase composition,morphology and dispersibility of the alumina powder were systematically studied by X-ray diffractometer(XRD),scanning electron microscope(SEM),thermogravimetric-differential scanning calorimeter(TG-DSC)and Fourier transform infrared spectrometer(FTIR).The results show that the dispersibility and morphology of theα-Al_(2)O_(3) powder can be changed by adjusting the mass ratio of aluminum nitrate and aluminum sulfate.The addition of sulfate ions makes the aluminum hydroxide precursor transform into the boehmite phase,and the preparedα-Al_(2)O_(3) powder has a regular morphology.With the increase of the pH value,the precursor phase changes from amorphous aluminum hydroxide to the bayerite phase through the boehmite phase,and the preparedα-Al_(2)O_(3) powder is seriously agglomerated.When the mass fractions of aluminum nitrate and aluminum sulfate are 75%and 25%respectively,the pH value of the solution is 7,and the precursor is heated at 1200℃for 2 h,theα-Al_(2)O_(3) powder with good dispersibility and regular morphology can be prepared.

关 键 词：α-Al_(2)O_(3) 溶胶-凝胶法 显微结构 粒径分布 

分 类 号：TQ174.75[化学工程—陶瓷工业]