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题名	荧光灯用氧化铝粉体的制备与性能表征
作者	韩强
学位类别	硕士
答辩日期	2011-06-09
授予单位	中国科学院研究生院
导师	陈运法
关键词	氧化铝 薄水铝石 水热法 可见光透过率 微结构
其他题名	Preparation and characterization of γ-Al2O3 powder for protective film of fluorescent lamps
学位专业	化学工程
中文摘要	节能灯正式名称为稀土三基色紧凑型荧光灯，主要是由“上部灯头结构”以及“底部灯管结构”组成。为了降低光衰以及防灯管黑化现象，人们在灯管与荧光粉之间涂一层氧化铝膜来达到保护节能灯的作用。氧化铝作为常用的工业材料有多种不同的晶相（如：δ、θ、α、γ-Al2O3等），其中γ-Al2O3被广泛用于催化剂、吸附剂、涂料以及高级陶瓷等。目前，市场上荧光灯保护膜材料大多采用德国Evonik Degussa公司气相法生产γ-Al2O3颗粒。针对其设备复杂、形貌单一、具有垄断性的特点，本文采用水热法并结合煅烧工艺制备出具有不同结构的γ-Al2O3颗粒，并对其成膜致密性与可见光透过性能进行了研究。主要研究内容及结果如下： (1) 采用水热工艺合成了粒径约100nm的薄水铝石颗粒，通过研究薄水铝石颗粒在煅烧过程中的晶型转变以及失水过程，发现在700℃对薄水铝石颗粒煅烧4h可以制得具有相同结构的γ-Al2O3颗粒。通过对原料价格以及合成条件的比较选择柠檬酸-硝酸铝-尿素体系作为合成γ-Al2O3的基本体系。 (2) 柠檬酸及尿素分别作为结构调控剂和沉淀剂、Al(NO3)3•9H2O作为铝源，通过调节水热温度与柠檬酸的浓度制备得到棒状、片状、100nm粒径类球状、刺猬状、壳状、500nm粒径球状、1μm球状薄水铝石颗粒，并由在700℃对薄水铝石颗粒煅烧4h制得γ-Al2O3颗粒。 (3) 通过对不同纳米结构的γ-Al2O3颗粒成膜进行表征，发现具有片状结构的γ-Al2O3颗粒具有较好的成膜致密性，其可见光透过率在400nm-800nm波长处随波长增加而增加，最大透过率可达80%。 (4) 通过对片状γ-Al2O3颗粒进行Mg、Sm、Ce、Eu、Fe、Gd元素掺杂，发现以Al2O3：CeO2摩尔比为10:1时样品对可见光的透过率提高最大，在波长300nm-500nm处提高20%左右，在波长500nm-800nm处提高10%左右。
英文摘要	Electricity-saving lamp, the formal name is Rare earth three-basis-colors compact fluorescent lamp, which consist of lamp cap in upside and lighting tube in bottom. In order to lower the light decay and avoid the melanism of lighting tube, theγ-Al2O3 film was used between glass of the lighting tube and phosphor powder. Alumina as one of the most useful materials in industry has many crystal phases, such as δ、θ、α、γ-Al2O3 etc, of which γ-Al2O3 materials are widely used as catalysts, adsorbents, coatings and advanced ceramics etc. At present, the γ-Al2O3 materials used for protective film of fluorescent lamps in the market of china are monopolized by Evonik Degussa Corporation, which is produced by vapor phase method. The Evonik Degussa’s γ-Al2O3 materials exhibit spherical morphology with ca.50nm in diameter and furthermore, the equipments for vapor phase method are rather complicated. Based on the reasons mentioned above, various boehmite particles with different morphologies were synthesized in this study by simple hydrothermal method, and the identical morphology of γ-Al2O3 particles was obtained coupled with calcination. The transmission of visible light and the compactness property of membranes made by different morphological γ-Al2O3 particles were also investigated. Main research contents and results were summarized as follows: (1) The boehmite particles with ca.100nm in diameter were synthesized by hydrothermal method. Phase transformation and dehydration mechanism in the calcinations process was investigated to obtain the identical morphological γ-Al2O3 particles. Aluminum nitrate, urea and citric acid, were chosen as hydrothermal reaction reagents, considering the price and the environment pollution. (2) boehmite particles with different morphologies were synthesized by changing the conditions in the hydrothermal reaction. During the process, aluminum nitrate, urea and citric acid were used as Al3+ source, precipitator and structure directing agent, respectively. (3) The membranes made by γ-Al2O3 particles with different morphologies were analyzed. It is shown that membranes made by petal-like γ-Al2O3 particles exhibit the fine compactness property, and its visible light transmission raised with the wavelength increased. The maximum value of visible light transmission is 80%. (4) To increase the membranes transmission in visible light range, the petal-like γ-Al2O3 particles were doped by Mg, Sm, Ce, Eu, Fe, Gd. The results showed that it could improve the membranes transmission in visible light range effectively when the petal-like γ-Al2O3 particles were doped by Ce with the mole ratio of 1:10 (Ce: Al). The visible transmission can raise 20% in the wavelength rang from 300nm-500nm, and 10% in the wavelength rang from 500nm-800nm.
语种	中文
公开日期	2013-09-23
页码	69
内容类型	学位论文
源URL	[http://ir.ipe.ac.cn/handle/122111/1663]
专题	过程工程研究所_研究所（批量导入）
推荐引用方式 GB/T 7714	韩强. 荧光灯用氧化铝粉体的制备与性能表征[D]. 中国科学院研究生院. 2011.

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