络合溶胶-凝胶法制备Al_2O_3纳米晶及其表征(英文)  

PREPARATION AND CHARACTERIZATION OF ALUMINA NANOCRYSTALLINE POWDER BY COMPLEXING SOL-GEL METHOD

作　　者：石涛[1] 申乾宏[1] 周箭[1] 杨辉[1,2] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027 [2]浙江加州国际纳米技术研究院,杭州310029

出　　处：《硅酸盐学报》2009年第4期627-630,共4页Journal of The Chinese Ceramic Society

基　　金：浙江省重大科技计划(No.2006C11029)资助项目。

摘　　要：以异丙醇铝为原料,用聚乙二醇(PEG1000)络合溶胶-凝胶法合成了Al2O3纳米晶,并采用差热-热重分析、X射线衍射、透射电子显微镜等对络合前驱体及粉体进行表征;探讨了PEG1000及煅烧温度对纳米Al2O3相结构、粒子尺寸、形貌及分散性的影响规律。结果表明:PEG1000增强了纳米Al2O3粒子的分散性。干凝胶在600～900℃煅烧后得到γ-Al2O3相;在600℃煅烧条件下,得到γ-Al2O3粒子形貌为针状结构,长度约为50～60nm;随着煅烧温度的升高,γ-Al2O3针状粒子长度逐渐减小,在750℃煅烧后,得到γ-Al2O3粒子长度为20～30nm;在900℃煅烧条件下,γ-Al2O3粒子形貌为颗粒状,平均粒径尺寸为10nm;当干凝胶在1000℃煅烧后得到θ-Al2O3和α-Al2O3的混合相,所得粒子平均粒径尺寸为20nm;当干凝胶在1200℃煅烧后,得到的Al2O3全部转化α-Al2O3相,制得的纳米Al2O3粒子尺寸均一且分散性良好。A nanocrystalline alumina （Al2O3） powder was synthesized from aluminum isopropoxide （Al（OC3H7）3 ） by the complexing sol-gel method using polyethylene glycol （PEG1000） as a complexing agent. The complexing precursor and the powder calcined at various temperatures were characterized by differential thermal analysis/thermogravimetric analysis, X-ray diffraction and transmission electron microscopy. The effects of complexing agent and calcination temperature on the powder dispersion, phase structure size and morphology of particles were discussed. The results show that the addition of complexing agent can improve the particle dispersion. The alumina powder with 7-Al2O3 phase can be obtained after the gel powder was calcined at 600-900 ℃. The morphology of 7-Al2O3 particles calcined at 600 ℃ is needle-like with a length of about 50-60 nm. Since the needle-like particles become shorter with increasing calcination temperature, the length of the particles is thus 20-30 nm at 750 ~C. The particles calcined at 900 ℃ become grain-like with a size of 10nm. The gel particles calcined at 1 000 ℃ is a mixture powder with θ-Al2O3, α-A12O3 phases with a size of 20 nm. The phase of the particles calcined at 1 200 ℃ can be transformed into α-Al2O3 phase.

关 键 词：纳米三氧化二铝 溶胶-凝胶法 络合 异丙醇铝 

分 类 号：TQ424.27[化学工程]