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Al2O3-SiO2复合膜的制备与结构表征

俞建长; 徐卫军; 胡胜伟; 黄清明   

  1. 福州大学材料科学与工程学院, 福州 350002
  • 收稿日期:2004-08-05 修回日期:2004-10-10 出版日期:2005-09-20 网络出版日期:2005-09-20

Preparation and Structural Characterization of Al2O3-SiO2 Composite Membrane

YU Jian-Chang; XU Wei-Jun; HU Sheng-Wei; HUANG Qing-Ming   

  1. College of Materials Science and Engineering; Puzhou University; Fuzhou 350002; China
  • Received:2004-08-05 Revised:2004-10-10 Published:2005-09-20 Online:2005-09-20

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摘要： 以异丙醇铝和正硅酸乙酯为主要原料,用溶胶-凝胶法制备无支撑体Al2O3-SiO2复合膜.应用XRD、DTA-TGA、IR、BET等测试手段对复合膜的物相组成、热稳定性、孔结构进行表征.并且讨论了化学组成和煅烧温度对复合膜孔结构的影响.研究结果表明:550℃煅烧10h的复合膜物相组成为无定形的SiO2和γ-Al2O3晶体,粒度大小在2-4nm之间,化学组成为Al2O3/SiO2=3:2的复合膜在不同煅烧温度时,400℃煅烧的物相为γ-AlOOH和,γ-Al2O3,550-1150℃煅烧的物相为γ-Al2O3,1220℃煅烧的物相为γ-Al2O3和α-Al2O3,1300℃煅烧的物相为莫来石相和α-Al2O3;化学组成不同的复合膜主要是由Al-O网络和Si-O网络构成,没有形成Al-O-Si网络结构;复合膜具有良好的热稳定性;化学组成和煅烧温度对复合膜的孔结构有一定的影响.

关键词: 异丙醇铝, 正硅酸乙酯, 溶胶-凝胶法, Al2O3-SiO2复合膜

Abstract: Al2O3-SiO2 composite membrane was prepared by sol-gel process using aluminium isopropoxide and
tetraethoxysilane as raw materials. The phase constitution, thermal stability, and the pore structure were characterized by means of XRD, DTA-TGA, IR, BET
etc. The results show that the phase constitution of the composite membrane was SiO2 and γ-Al2O3 after calcined at 550℃ for 10h,
and the particle size range from 2nm to 4nm. The XRD results of the composite membrane (Al2O3/SiO2=3:2) calcined at different temperatures show that
the membrane is constituted of γ-AlOOH and γ-Al2O3 at 400℃, γ-Al2O3 at 550℃ to 1150℃, γ-Al2O3 and α-Al2O3 at 1220℃, mullite
and α-Al2O3 at 1300℃. Al2O3-SiO_2 composite membrane is constituted of Al--O and Si--O networks, and no Al--O--Si network
found membrane. The composite membrane has high thermal stability, and the pore structure of the membrane can influence on its constitution and
the thermal treatment temperatures.

Key words: aluminium isopropoxide, tetraethoxysilane, sol-gel, Al2O3-SiO2 composite membrane

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