铝合金表面新型有机-无机杂化纳米Si02涂层的制备及其性能

为了提高铝合金的耐腐蚀性能、耐磨损性能及硬度,通过溶胶-凝胶反应,以纳米硅溶胶为主要原料,有机硅烷为偶联剂,制备了新型纳米SiO2防腐蚀涂料。通过浸渍-提拉法在铝合金（LY12）基体表面形成涂层,通过改变硅溶胶的含量,详细研究了此涂层的显微硬度、耐磨性能和耐腐蚀性能与硅溶胶含量的关系。结果显示,新型有机-无机杂化纳米SiO2涂层厚度为20μm时具有良好的耐腐蚀性能和耐磨性能,由此而使此杂化膜替代对环境有害的铬酸盐转化膜成为可能,并为有机-无机杂化纳化材料的应用提供了理论依据。     

铝合金表面新型有机-无机杂化纳米SiO2涂层的制备及其性能

为了提高铝合金的耐腐蚀性能、耐磨损性能及硬度,通过溶胶-凝胶反应,以纳米硅溶胶为主要原料,有机硅烷为偶联剂,制备了新型纳米SiO2防腐蚀涂料.通过浸渍-提拉法在铝合金(LY12)基体表面形成涂层,通过改变硅溶胶的含量,详细研究了此涂层的显微硬度、耐磨性能和耐腐蚀性能与硅溶胶含量的关系.结果显示,新型有机-无机杂化纳米SiO2涂层厚度为20μm时具有良好的耐腐蚀性能和耐磨性能,由此而使此杂化膜替代对环境有害的铬酸盐转化膜成为可能,并为有机-无机杂化纳化材料的应用提供了理论依据.     

二氧化硅基有机-无机防腐蚀杂化膜的制备及性能

传统的钢铁表面覆膜技术如磷化、铬酸盐钝化等污染严重,硅烷化和有机-无机杂化涂层用于金属预处理则具有耐温、耐腐蚀等优点,又利于环保.以正硅酸乙酯、γ-氨丙基三乙氧基硅烷为原料,采用溶胶.凝胶法制备了SiO2基有机-无机杂化材料.通过红外光谱对不同温度处理的杂化材料进行了分析,以差示扫描量热法研究了杂化材料在不同温度下的吸放热反应,结合对杂化溶胶涂覆于钢铁基体表面形成涂层的塔菲尔曲线分析,对杂化膜的保护性能进行了研究.结果表明:涂层试样在N2气氛下300℃热处理,可以保证涂层中Si-O-Si键等最大程度地键合,并有效保留了有机组分,从而有利于保证杂化材料涂层的完整性,较大地提高了基体钢铁的耐腐蚀性能,可作为金属表面涂装处理工序中良好的中间过渡层.     

AZ91D镁合金表面无铬转化膜/杂化复合涂层的耐蚀性能

溶胶凝胶法制备的涂层性能优良,采用溶胶凝胶法、以正硅酸乙酯为主制备性能优良的涂层技术已很成熟,但用于镁合金的防护鲜有报道。为了提高AZ91D镁合金的耐蚀性能,先在其表面制备了无铬钼酸盐转化膜,然后采用有机/无机杂化溶胶凝胶的方法在转化膜表面制备杂化涂层,从而得到转化膜/杂化复合涂层。对复合涂层进行了红外光谱分析,并用扫描电镜(SEM)观察了其微观形貌,同时也对其进行了极化曲线和电化学阻抗谱分析。结果表明:二氧化硅和有机硅氧键通过溶胶凝胶反应,无机和有机间呈网络结构穿插在一起;复合涂层表面平整均匀,无开裂现象;转化膜层和转化膜/杂化复合涂层都可提高镁合金的耐蚀性,但后者的效果更加明显。     

金属表面复合保护涂层的制备与性能研究

采用溶胶-凝胶法合成了有机-无机复合溶胶.用提拉法将复合溶胶涂覆在不锈钢基板上,基板上的湿凝胶经热处理后便形成了透明保护涂层.对制备好的涂层进行了附着力和硬度等性能分析,分析结果表明:有机-无机复合溶胶易于成膜,且成膜具有很好的耐磨性、韧性和耐腐蚀性.     

金属表面复合保护涂层的制备与性能研究

采用溶胶-凝胶法合成了有机-无机复合溶胶。用提拉法将复合溶胶涂覆在不锈钢基板上，基板上的湿凝胶经热处理后便形成了透明保护涂层。对制备好的涂层进行了附着力和硬度等性能分析，分析结果表明：有机-无机复合溶胶易于成膜，且成膜具有很好的耐磨性、韧性和耐腐蚀性。     

甲基丙烯酸甲酯-顺丁烯二酸酐共聚物/SiO2杂化材料的制备与性能

用γ-氨丙基三乙氧基硅烷(APTEOS)为交联剂，以甲基丙烯酸甲膏(MMA)、顺丁烯二酸酐(MAH)和四乙氧基硅(TEOS)为原料，通过自由基溶液聚合和溶胶-凝胶过程制得了两相间以共价键结合的透明MMA-MAH共聚物／SiO2有机-无机杂化材料。通过FT-IR分析证实了材料有机相与无机相之间是以共价键结合的．随着无机相含量的增加，材料热性能呈明显上升趋势．复合材料可见光透过率在75％左右，当SiO2含量超过一定值后，可见光透过率逐渐降低。研究结果初步表明，在复合材料中有机相和无机相是纳米复合的。     

镁合金表面SiO2/有机硅杂化涂层的制备及其耐腐蚀性能

为了提高镁合金的耐腐蚀性能,先对其表面进行磷化,再采用溶胶-凝胶法在磷化膜表面制备SiO2/有机硅杂化涂层。采用电化学工作站测试涂层的极化曲线,并用金相显微镜观察了其腐蚀前后的表面形貌。结果表明:磷化膜表面的杂化涂层光滑、黏附性优良,硅溶胶与有机硅树脂形成了有机无机网络连接;磷化膜表面涂覆有机硅树脂和杂化涂层都可以显著提高镁合金的耐腐蚀性能,但后者的效果更加明显。     

冷轧钢表面锆盐复合硅烷涂层的性能及结构研究

采用溶胶-凝胶法,以氟锆酸钠与1,2-双(三甲氧基硅基)乙烷(BTMSE)为前驱体,在冷轧钢基体上制备无机/有机复合硅烷涂层。采用电化学技术(Tafel曲线与阳极极化曲线)及硫酸铜点滴实验对比考察复合硅烷涂层与纯硅烷涂层防腐性能。使用SEM,FTIR,XPS等测试方法考察其腐蚀前后表面形貌、官能团组成、元素价键结构等性质。结果表明:相比于纯硅烷涂层,复合涂层的腐蚀电流密度明显降低,极化电阻明显增大,腐蚀前后微观形貌基本不变。通过XPS对价键进行分析,认为在金属表面形成了Si-O-Zr键。对锆盐在金属表面成键及防腐机理进行探讨,并提出了新的结构模型。     

冷轧钢表面锆盐复合硅烷涂层的性能及结构研究EI北大核心CSCD

采用溶胶-凝胶法,以氟锆酸钠与1,2-双(三甲氧基硅基)乙烷(BTMSE)为前驱体,在冷轧钢基体上制备无机/有机复合硅烷涂层。采用电化学技术(Tafel曲线与阳极极化曲线)及硫酸铜点滴实验对比考察复合硅烷涂层与纯硅烷涂层防腐性能。使用SEM,FTIR,XPS等测试方法考察其腐蚀前后表面形貌、官能团组成、元素价键结构等性质。结果表明:相比于纯硅烷涂层,复合涂层的腐蚀电流密度明显降低,极化电阻明显增大,腐蚀前后微观形貌基本不变。通过XPS对价键进行分析,认为在金属表面形成了Si-O-Zr键。对锆盐在金属表面成键及防腐机理进行探讨,并提出了新的结构模型。     

用Sol-Gel法在PC上制备有机-无机复合耐磨涂层

用ｓｏｌ－ｇｅｌ法在聚碳酸酯ＰＣ上制备一层耐磨涂层。该涂层为有机－无机复合网络,由γ—缩水甘油醚氧丙基三甲氧基硅烷（γ—ＧＰＴＭＳ）和金属醇盐Ｔｉ（ＯＣ２Ｈ５）４合成。采用浸涂工艺,热固化后可得到几微米厚的透明涂层。用３—氨丙基三乙氧基硅烷（３—ＡＰＳ）对ＰＣ表面进行处理,可使涂层与基体的结合力大大提高。涂层的基本骨架由Ｓｉ－Ｏ－Ｔｉ组成,能显著改善ＰＣ材料的耐磨性能。     

硅烷偶联剂在金属表面预处理中的应用研究进展

近年来发展的硅烷偶联化预处理技术因其对环境友好、可操作性强,有望成为金属表面铬钝化处理的替代工艺。硅烷膜作为金属表面预处理层,不但改善了基材表面的状态,增强了涂料与基材间的黏附性能,也可作为单独的防护涂层,对腐蚀介质的渗透起着物理屏障作用。主要从3个方面介绍了硅烷偶联剂在金属表面预处理中的研究进展:(1)金属表面硅烷偶联化机理;(2)金属基材表面状态、硅烷水解体系、硅烷成膜方式及膜固化方式等工艺对膜性能的影响;(3)硅烷预处理技术研究的新进展,包括传统浸渍成膜、电沉积辅助法制备硅烷膜及无机稀土金属盐、纳米颗粒、缓释剂掺杂制备的硅烷杂化膜的研究现状。     

Compatibility enhancement of polyimide-silica hybrid sol-gel materials without incorporation of silane-coupling agent

A facile route has been developed to enhance compatibility between organic polyimide matrix and dispersed phase of inorganic silica particles without addition of conventional silane-coupling agent. The as-prepared hybrid sol-gel materials having reduced size of SiO2 particle dispersed in polyimide matrix were successfully synthesized through pre-catalyzed sol-gel route using an organic diamine base. The PI-silica hybrid materials through conventional polyamic acid-catalyzed sol-gel route with/without silane-coupling agent were also prepared for comparative control studies. Morphological feature of as-prepared sol-gel materials prepared from three different approaches was also compared based on the studies of transmission electron microscopy. Effects of the material composition, in three different catalyzed routes, were investigated by thermal stability, mechanical strength, optical clarity, gas barrier and water absorption measurements of polyimide and a series of polyimide-silica hybrid sol-gel materials, respectively.     

有机-无机杂化材料在骨修复中的应用

已经应用于临床的骨修复材料主要是生物活性陶瓷和金属如钛及其合金制成的生物材料,它们能与生物骨结合但与人体松质骨相比弹性模量高且柔韧性较低.需要研究1种具有与天然生物骨相类似力学性能的生物活性材料.目前制备这种材料的方法有溶胶-凝胶法、共混法、插层复合法.已分别用明胶、PDMS、PTMO及MPS与无机系统合成了生物活性的有机-无机杂化材料.其今后主要发展方向在于有机成分的引入以达到最佳的柔韧性和力学强度以及作用机理的研究以提高生物活性.     

Preparation of silica-based hybrid materials coated on polypropylene film

In this study, silica-based organic–inorganic hybrid coating materials were prepared by the sol–gel method. Tertaethoxysilane and polyvinyl alcohol were used as the inorganic and organic compounds, respectively. The substrate polypropylene film surface was modified by corona-plasma treatment to provide appropriate adhesion between the coating material and the polymer base film. A silane.coupling agent of vinyltriethoxysilane was also used to improve the adhesion between the base film and the coated layer. The effects of vinyltriethoxysilane in the hybrid materials were investigated using Fourier transform infrared analyses and X-ray diffraction. The vinyl group of vinyltriethoxysilane increased the hydrophobicity of the hybrid materials. The polypropylene films coated with the hybrid materials were characterized by examining their morphology, optical transparency and oxygen permeability. The results showed that the formation of hydrogen bonds between polyvinyl alcohol and the other compounds affected the microstructure of the coating solution and the final oxygen permeation property. Further, although the presence ofvinyltriethoxysilane in the hybrid coating solution could improve adhesion between the coated layer and the polymer base film, it deteriorates the effectiveness of the barrier to prevent of oxygen permeation through the coated film. However, the coated film maintained visible transparency and even enhanced the transmission of long wavelength visible-light owing to refractive index matching.     

Nanostructured fumed metal oxides for thermal interface pastes

Fumed metal oxides (13 nm aluminum oxide particles and 20–25 nm zinc oxide particles), which are in the form of porous agglomerates of nanoparticles, are effective as thermally conductive solid components in thermal pastes. They are as effective as carbon black, but are advantageous in their electrical non-conductivity. Without fuming, the oxides are less effective. By coating with silane, which decreases the viscosity of the paste, they are even more effective. The organic vehicle (polyol esters) and solid component content (2.4–4.0 vol.%) are chosen to attain conformability and spreadability. The use of either 4.0 vol.% silane coated fumed zinc oxide or 2.4 vol.% silane coated alumina gives thermal pastes that are more effective than commercial thermal pastes (Ceramique and Shin-Etsu). Fumed zinc oxide is superior to non-fumed zinc oxide in improving the thermal stability. Silane coating of the fumed zinc oxide further improves the thermal stability. Fumed alumina does not affect the thermal stability, but silane coated fumed alumina improves the thermal stability. Though silane coated fumed zinc oxide is superior to silane coated alumina in enhancing the thermal stability, it is slightly inferior in the phase separation tendency.     

金属表面硅烷复合化处理的研究进展及发展趋势

金属表面硅烷化处理技术具有绿色环保、步骤简单、能耗小等优点,形成的硅烷膜缺陷少、结合力强、耐蚀性能好,具有与铬钝化膜相当的抗腐蚀性。但是单一的硅烷膜一旦受到机械损伤,就会失去对金属基体应有的保护。主要从稀土、钼酸盐、氟钛(锆)酸盐等方面介绍了目前国内外常用的金属表面硅烷化处理的改性方法,重点介绍了不同金属稀土对硅烷化处理技术的改性研究,并对稀土-硅烷膜的缓蚀机理进行了初步探讨,对硅烷化处理技术的发展趋势进行了展望。     

硅烷在无铬锌铝涂料中的应用现状及展望

硅烷偶联剂含有机和无机结构,既可以作腐蚀抑制剂,也可以作良好的粘结剂,同时还具有无污染、无毒、成本低、适用范围广的特点,在无铬锌铝涂层的应用上有很大的发展空间。总结了国内外硅烷在无铬锌铝涂层中的应用情况,指出复配硅烷和含环氧基团的硅烷类技术具有很好的发展潜力。     

Funktionelle Schichten auf Metallen: Maßgeschneiderte Eigenschaften durch Sol‐Gel‐Technologie

Functional Layers on Metals: Tailored Properties by Sol‐Gel Technology The value of metal articles can be substantially enhanced by convenient surface coatings. Beside organic layers (e. g. paints) and inorganic layers (e. g. enamel) wellknown as coating materials, so‐called inorganic‐organic hybrid polymers set out to combine the advantages of both coating groups. For the manufacture of such hybrid materials functional particles with sizes of a few nanometers – so‐called nanoparticles – are synthesized in the sol‐gel process. The versatility of this procedure allows to cover an extreme variety of properties of the resulting layers. Thus, depending on their composition, sol gel coatings are suited as corrosion protection, as primer, as abrasion‐reducing coating or as easy‐to‐clean layer. A sufficient wetting and adhesion on vitually any substrate can be achieved by proper choice of functional groups and pretreatment steps.