溶胶-凝胶法制备氧化铝薄膜

以Al(NO3)3·9H2O作为前驱体制备AlOOH溶胶,通过提拉法在不锈钢表面形成氧化物薄膜。探讨了热处理制度和表面处理对薄膜形成过程的影响,并通过XRD和SEM等分析手段对氧化铝薄膜形成过程的物相组成和表面质量进行了分析。实验结果表明:温度在500～800℃,升温速率控制在1.5℃/min,可以得到表面致密的氧化铝薄膜,所制得的薄膜成分以晶态氧化铝和非晶态氧化铝共存,其中晶态氧化铝以γ-氧化铝的形式存在。     

溶胶-凝胶法制备多晶氧化铝纤维的研究

本文探讨了溶胶-凝胶法制备多晶氧化铝过程中影响胶体性能的因素,成纤方法与工艺参数,热处理工艺制度及晶相转化关系等一系列问题.实验得到了以莫来石为主晶相长期使用温度超过1500℃的多晶氧化铝纤维.     

溶胶-凝胶法合成小尺寸板状氧化铝

以氟化物为矿化剂，通过热处理使γ-A12O3在气相传质下转变为小尺寸的板状α—Al2O3。利用XRD和SEM等手段，测定了板状氧化铝的特性，研究了制备工艺、HF含量、反应温度等因素对其特性的影响。结果表明：含AlF32％(质量分数)的混合料，在l100℃下保温180min可以得到直径为2μm的板状α—Al2O3。在此基础上，详细阐述了板状氧化铝的形成机理。     

溶胶-凝胶法制备氧化铝系复合膜的研究进展

介绍了采用溶胶-凝胶法制备Al2O3系复合膜的研究发展现状以及掺入不同外加组分后Al2O3膜的结构特点及其影响机理,同时指出了用溶胶-凝胶法制备氧化铝系复合膜过程存在的问题及发展趋势。     

溶胶凝胶法氧化铝分离膜制备工艺探讨

以异丙醇铝为主要原料,将原料予处理后,用溶胶-凝胶法制备Al2O3膜,考察胶溶剂的种类和用量、水解温度、回流时间等制备条件对Al2O3膜微观结构的影响.研究结果表明,选择用HCl作为胶溶剂,调节溶液pH值为2.0～3.5、水与乙醇体积量比为1∶1、水解温度为80～85 ℃左右.通过预处理,合成时间缩短,为6～8 h左右.可以制得微观结构性能比较好的Al2O3膜.     

溶胶凝胶法氧化铝分离膜制备工艺探讨

以异丙醇铝为主要原料，将原料子处理后，用溶胶-凝胶法制备Al2O3，膜，考察胶溶剂的种类和用量、水解温度、回流时间等制备条件对Al2O3，膜微观结构的影响。研究结果表明，选择用HCl作为胶溶剂，调节溶液pH值为2．O-3．5、水与乙醇体积量比为1：1、水解温度为80～85℃左右。通过预处理，合成时间缩短，为6～8h左右，可以制得微观结构性能比较好的Al2O3膜。     

溶胶-凝胶法制备氧化硅-氧化铝体系凝胶及合成过程研究进展

氧化硅-氧化铝（SiO₂-Al₂O₃）体系凝胶不仅应用广泛,而且其制备及反应机理还可借鉴到碱激发胶凝材料等领域。通过对溶胶-凝胶法合成氧化硅-氧化铝体系凝胶的制备过程及影响因素和影响规律、凝胶的性质和结构表征及合成机理研究进展进行综述,提出目前仍缺乏有关碱（土）金属离子对凝胶结构性能的影响研究以及硅铝含量变化的定量描述数据,建议拓宽研究范畴,结合核磁共振等检测方法,得出该体系结构性能变化准确数据,为氧化硅-氧化铝体系凝胶的设计和应用夯实基础。     

溶胶-凝胶法制备氧化铝纤维的研究

采用溶胶-凝胶法,以AlCl3·6H2O、金属Al粉、ZrOCl2·6H2O、和H2O为原料制备氧化铝纤维.主要研究了拉丝助剂(HCl和HAc)、烧结温度及ZrO2添加量对氧化铝纤维性能的影响.研究结果表明同种拉丝助剂添加量越大,可拉丝时间越长.在1000～1400 ℃烧结范围内,烧结温度对纤维的表面结构影响不大;1400 ℃下可以得到晶粒发育完善,晶型完整以及拉伸强度最佳的氧化铝纤维.ZrO2可对氧化铝纤维起到增强作用,但随着ZrO2量的增加,拉伸强度的增加作用逐渐减小.     

溶胶-凝胶法在氧化铝板晶和微粉表面包裹玻璃涂层

以硅酸乙酯和硝酸钙为原料，制备了CaO-SiO2溶胶。采用液相包裹技术在氧化铝板晶和粉末表面上包裹了一层Ca0-SiO2玻璃。用DTA／TGA研究了凝胶热分解过程。用SEM观察表明，玻璃涂层在氧化铝板晶或氧化铝微粉团聚体表面上的分布是均匀的。     

用溶胶-凝胶法制备Al_2O_3涂层工程陶瓷的表面改性研究

分析了溶胶 -凝胶法制备Al2 O3 溶胶的适宜工艺条件 ,在氧化铝基陶瓷基体上成功地制备了Al2 O3 涂层 ;利用X射线衍射分析和差热分析 (DTA)方法对Al2 O3 凝胶粉末的相变过程进行了研究 .通过分析精磨、热处理、Al2 O3 一次和二次溶胶涂层 4种试样的抗弯强度测量值对材料总体性能进行了估计 .结果表明 :Al2 O3 涂层工程陶瓷可以提高基体的抗弯强度而降低其分散性 ,效果好于单纯的热处理 .通过观察4种试样的表面SEM形貌和两种涂层试样的断面SEM形貌提出了溶胶涂层钝化或弥合表面微裂纹的理论模型     

Characterization of UV curable hybrid hard coating materials prepared by sol-gel method

Using sol-gel method, UV-curable urethane acrylate resin system was hybridized with inorganic silicate network to produce hybrid coating materials with high anti-abrasive property. In preparation of acrylate/SiO₂ hybrid materials, various acrylic reactants with multi-functional groups in addition to urethane acrylate oligomer as the main network former were employed to obtain more densified organic network structure with a high degree of cross-linking. As a silane coupling agent, 3-methacryloxypropyl-trimethoxysilane (MPTMS) was used to promote interfacial attraction between UV-cured organic acrylate resin and inorganic silicate component in the hybrid. The addition of MPTMS offered significant effect on the improvement of phase compatibility between organic and inorganic phases, which resulted in stable and homogeneous morphology with a dispersion of nano-sized fine silica particles. The results of morphological observation, glass transition behavior, and optical transparency for the hybrid gels provided an evidence for the increased interfacial attraction between two phases. From the Taber abrasion test for the hybrid coating films, it was revealed that there existed optimal ranges of inorganic silicate precursor TEOS and silane coupling agent MPTMS contents for the preparation of UV cured acrylate/SiO₂ hybrid with high abrasion resistant property.     

溶胶-凝胶法制备彩色玻璃吸热膜工艺研究

采用溶胶-凝胶法制备出以三氧化二铁-二氧化硅为镀层的彩色吸热玻璃。研究了浸涂液中硝酸铁和水的含量,提升速度、升温速度对成膜效果的影响。优选出最佳工艺,采用该工艺可获得均匀、致密、牢固的彩色膜。     

Preparation of aluminum hydroxide gels by the sol-gel method

Aluminum hydroxide gels were prepared by ihe sol-gel method. The role of acid in sols was investigated through the analysis of telling lime and hydrolysis rale. The phase transformation of gels with calcination temperatures was also monitored with X-Ray diffraction. The gelling times of the aluminum hydroxide sols decreased with the increase of acid content. Exceptionally, the solution peplized with 0.07 HCI/alkoxide molar ratio look longer time than other solutions until the gellation. The hydrolysis rate of aluminum hydroxide was much faster as the acid concentration increased during peptization. In the case of NH₄OH as a peptizing agent, there was Ihe lower rate of hydrolysis and thus the more alkoxyl groups were remained in the gel.     

Eco-friendly method of fabricating indium-tin-oxide thin films using pure aqueous sol-gel

An indium-tin-oxide (ITO) thin film with approximately 50 nm thickness was successfully synthesized on glass substrates by using a fully aqueous sol-gel process. The sol was prepared from indium nitrate hydrate and tin fluoride as a precursor. Thermogravimetric analysis confirmed that the sol converted into crystalline ITO at 286 °C. The optical band gap and transmittance of the thin film were observed to increase with annealing temperature and plasma treatment time. X-ray photoelectron spectroscopy and transmittance studies established that the number of oxygen vacancies in the thin film drastically increased with increasing temperature and plasma treatment. The annealing temperature and argon plasma treatment time appear to be key factors in reducing resistivity and increasing the transmittance of the thin film. A considerable decrease in the resistivity of the ITO thin film was observed after Ar plasma treatment. This eco-friendly sol-gel ITO thin film may find potential applications in n-type ohmic electrodes for ink-jet printable electronics.     

Preparation of alumina fibers from aluminum salts by the sol-gel method

Alumina fibers were synthesized from two different systems, AlCl₃-Al powder-H₂O and Al(NO₃)₃-Al powder-H₂O, by the sol-gel method. For the former system, gel fibers were obtained from solutions in a composition range of Al powder/AlCl₃ molar ratios of 2 to 5. For the latter system, the spinnable range was narrower compared to the aluminum chloride system. The thermogravimetry analysis (TGA) curve of the aluminum chloride system showed a weight loss up to 700‡C while the TGA curve of the aluminum nitrate system showed no weight loss above 400‡C, which indicates that thermal decomposition of Cl_- is more difficult than that of NOgk-/3.     

前驱体法制备氧化锆无机纤维的研究

用前驱体载体溶液浸渍法制备了氧化锆无机纤维,经热处理200℃开始炭化,600℃纤维炭化基本完成。采用TG-DSC分析浸渍前后纤维的热性能,用FT-IR、SEM、XRD分析热处理前后纤维的组织结构。研究结果表明:氧化锆纤维的开始形成温度为400℃;热处理前纤维主要由纤维和锆盐组成,热处理后样品为单一的ZrO2组分;氧化锆纤维制品具有与前驱体纤维相同的物理形貌,单根纤维饱满,直径约为4～5μm;组成纤维的主晶相为t-ZrO2,并随热处理温度的升高出现次相c-ZrO2。     

溶胶-凝胶法由菱镁矿制备氧化镁晶须的工艺研究

采用溶胶-凝胶法,以菱镁矿、盐酸和尿素为原料,加入成胶剂柠檬酸并烘干,生成前驱体后利用程序升温在高温下煅烧得到氧化镁晶须。结果表明,制备氧化镁晶须的最佳条件为:反应体系温度100℃,溶液pH值为6,并分别加入MXC-2及DXC-3晶形控制剂。晶须长径比为20³0∶1,长度为30μm,并具有良好的结晶状态。     

Silicate nanosized films prepared by the sol-gel method for use in planar technology for fabricating semiconductor gas sensors

This paper reports on the results of investigations into the specific features of the formation of silicate nanosized films from sols based on tetraethoxysilane (hydrolyzed in an acid medium in the presence of inorganic dopants) on the surface of semiconductor materials. The properties of the films thus prepared are analyzed as functions of the synthesis conditions of sols and the conditions of deposition and heat treatment of the films. It is demonstrated that these films can be used in technology for fabricating semiconductor gas sensors based on SnO₂.Original Russian Text Copyright © 2005 by Fizika i Khimiya Stekla, Shilova.     

sol-gel法制备NiZn铁氧体透明薄膜研究

采用溶胶-凝胶法制备NiZn铁氧体薄膜,研究了溶胶配制、甩胶及退火工艺对NiZn铁氧体薄膜性能的影响,系统研究了制备工艺和退火工艺。结果表明,不同的膜厚,改变了样品内的残余应力;在退火工艺上,升温速率直接影响成核数量,退火温度和保温时间决定薄膜的结晶程度和附着力的大小。通过对溶胶-凝胶法制备NiZn铁氧体薄膜技术的研究及工艺优化,得到合理的退火处理工艺为:以2.5℃/min的升温速率升到700℃,保温40 min后随炉自然冷却到室温。同时研究了NiZn铁氧体薄膜的可见光透过和微波损耗特性。     

sol-gel法制备NiZn铁氧体透明薄膜研究

采用溶胶-凝胶法制备NiZn铁氧体薄膜,研究了溶胶配制、甩胶及退火工艺对NiZn铁氧体薄膜性能的影响,系统研究了制备工艺和退火工艺。结果表明,不同的膜厚,改变了样品内的残余应力;在退火工艺上,升温速率直接影响成核数量,退火温度和保温时间决定薄膜的结晶程度和附着力的大小。通过对溶胶-凝胶法制备NiZn铁氧体薄膜技术的研究及工艺优化,得到合理的退火处理工艺为:以2.5℃/min的升温速率升到700℃,保温40 min后随炉自然冷却到室温。同时研究了NiZn铁氧体薄膜的可见光透过和微波损耗特性。