金属陶瓷涂层耐蚀性能研究

采用溶胶－凝胶浸渍提拉法在不锈钢、纯铜及铝合金基体上制备具有保护性的ＳｉＯ２、ＺｒＯ２、ＴｉＯ２、Ａｌ２Ｏ３及ＳｉＯ２－ＴｉＯ２陶瓷涂层,利用阳极极化曲线的、循环动电位极曲线、点蚀电位的测量以及三氯化铁和５％硫酸介质中的腐蚀试验研究了所得陶瓷涂层的耐蚀性。结果表明,这些陶瓷涂层能大幅芳提高金属基体在各种腐蚀介的耐蚀性。     

金属陶瓷涂层耐蚀性影响因素的研究

研究了溶胶制备中所用催化剂种类、基体金属前处理及涂层厚度对金属陶瓷涂层耐蚀性的影响,不含ＣＩ＾－催化剂的溶胶－凝胶配方所得陶瓷涂层的耐蚀性最了,适当的前处理及适宜的涂层厚度有利于提高陶瓷涂层的耐蚀性。     

AZ91D表面玻璃质陶瓷涂层的制备及性能研究

以Al1O3、SiO2为基料,通过加入PbO-B2O3-SiO2-ZnO-ZrO2系低熔点玻璃粉,在低于450℃的条件下热固化在镁合金表面制备陶瓷涂层,并用聚氯酯清漆封孔.通过测试,封孔涂层耐酸性提高22倍,耐碱性提高34倍,耐盐性提高18倍,耐磨性提高5倍.     

达克罗——一种优秀新型涂层

达克罗──一种优秀新型涂层高勤（南京宏光空降装备厂，２１００１２）达克罗涂层（欧美称ＤＡＣＲＯＭＥＴ，日本称为ＤＡＣＲＯＴＩＺＥＤ）是一种水溶性锌铝涂层，在欧美、日本已广泛应用。我厂从日本引进该技术，现简要介绍，以飨同仁。１达克罗涂层机理在黑色金属（...     

粉煤灰玻璃/陶瓷复合涂层制备工艺及性能研究

以粉煤灰为原料,采用热化学应法在Q235钢表面制备了玻璃/陶瓷复合涂层.采用X射线、扫描电镜(SEM)分别研究了涂层的物相组成及截面形貌,并测试了涂层的耐蚀、耐磨性能.结果表明:热固化后复合涂层有新相MgAl2O4 、Mg2Al4Si5O18、AlP04、Cr2O3等产生.复合涂层具有良好的热震性,相对基体的耐酸性、耐盐性分别提高21.3倍、2.5倍;耐磨粒磨损性提高6.6倍.     

碳化硅—石墨陶瓷涂层热辐射性能的研究

阐述了以碳化硅—石墨为基料的高辐射陶瓷涂层的性能及应用效果。这种材料具有高辐射率、高粘结强度、抗热震性能好等特点,是一种高效节能的陶瓷新材料。     

粉煤灰玻璃/陶瓷复合涂层制备工艺及性能研究

以粉煤灰为原料,采用热化学应法在Q235钢表面制备了玻璃/陶瓷复合涂层.采用X射线、扫描电镜(SEM)分别研究了涂层的物相组成及截面形貌,并测试了涂层的耐蚀、耐磨性能.结果表明:热固化后复合涂层有新相MgAl2O4 、Mg2Al4Si5O18、AlP04、Cr2O3等产生.复合涂层具有良好的热震性,相对基体的耐酸性、耐盐性分别提高21.3倍、2.5倍;耐磨粒磨损性提高6.6倍.     

迅速发展的新型陶瓷涂层

1、国外发展动态1.1 发展动态及市场销售情况新型陶瓷(或称精细陶瓷、先进陶瓷)由于高度耐热、抗磨、抗蚀,国外发达国家都将其作为战略材料优先开发。过去着重点多指单一陶瓷,今后单一陶瓷仍将     

金属表面电泳法制备陶瓷涂层的研究进展

陶瓷涂层具有耐磨、耐蚀、耐高温和抗微生物侵蚀等性能。介绍了国内外用电泳沉积法制备生物陶瓷涂层、碳化硅陶瓷涂层、氧化钛陶瓷涂层、氧化铝陶瓷涂层、氧化硅陶瓷涂层及氧化锆陶瓷涂层的研究进展,揭示了防腐领域中陶瓷涂层存在的问题,提出了解决方法并展望了未来的研究方向。     

Oligomeric silsesquioxane reinforced polyurethane with enhanced coating performance

A hydroxyl functional acrylic polyol (AP) resin was modified with silicone resin (silanol functional oligomeric silsesquioxane) by simple physical blending and also by chemical reaction between the two with the help of titanate catalyst. The blended (b-APS) and reacted (r-APS) pre-polymers were characterized by Fourier transform infrared (FTIR) spectroscopy, carbon nuclear magnetic resonance (¹³C-NMR) spectroscopy and gel permeation chromatography (GPC). The pre-polymers were then cured with isocyanate to obtain polyurethanes (PU) and their thermal, mechanical and coating properties were characterized. The higher glass transition temperature and storage modulus from dynamic mechanical analysis (DMA) indicates the superior mechanical properties of “silsesquioxane-modified” PU over the conventional unmodified PU. When compared, the PU from r-APS showed better thermomechanical properties than that from b-APS. The former also exhibited reduced phase heterogeneity as visualized by atomic force microscope (AFM) studies. When used as coating materials the incorporation of the silicone component both by physical blending and chemical reaction leads to molecular reinforcement of PU. Remarkable improvement was noticed in the performance properties of the coatings with respect to hardness, tensile strength, heat resistance, gloss and distinctness of image.     

Investigation on anticorrosion performance of nano and micro polyaniline in new water-based epoxy coating

In this research, a micro polyaniline (MicroPAni) and a dispersion of nano polyaniline particles (NanoPAni) were used as anticorrosion additive in a new water-based epoxy coating. Both materials were added directly to a new water-based hardener (RIPI-W.B.H.). The resulted mixtures were homogenized and sonicated for size reduction and better particle dispersion. The average particle size of polyaniline in the hardener was determined using dynamic light scattering (DLS). Transmission electron microscopy (TEM) was used to observe the particle size of polyaniline in the final dried film. After applying the coatings on metal surface, anticorrosion performance and adhesion properties of the coatings were compared together with a reference coating using salt spray and cross-cut adhesion tests. The results showed that anticorrosion performance of coating containing NanoPAni was better than the one for coating containing MicroPAni. In addition, investigation on the morphology of metal-coating interface by scanning electron microscopy (SEM) technique in samples containing polyaniline after salt spray test showed stable oxide layer formation on metal surface, which will enhance the corrosion resistance.     

Anti-oxidation performance of carbon aerogel composites with SiCO ceramic inner coating

To improve the oxidative-resistant ability of carbon fibre-reinforced carbon aerogel composites (C/CAs), C/CAs were impregnated with a silicon oxycarbide (SiCO) precursor sol several times. After gelating, aging, solvent exchanging, ambient drying, and pyrolyzing, the SiCO precursor sol infiltrated the nanoporous C/CA, and anti-oxidation carbon aerogel composites with a SiCO ceramic inner coating (C/CA-SiCO) were prepared. It was found that the density of the material increases with the number of times that impregnation and pyrolysis were carried out. The mechanical properties and the anti-oxidant performance were significantly improved after the deposition with different numbers of the SiCO coating cycles. The bending strength increased from 2.2?MPa to 10.8–32.3?MPa and the compressive strength (10%ε) increased from 0.4?MPa to 3.6–44.4?MPa. The weight loss for the as-prepared composites after heating at 1600?°C for 60?min in air was only 7.6%, and the in-plane shrinkage was less than 2%. Additionally, after the oxidation resistance test, the surface of the C/CA-SiCO had abundant β-SiO₂ crystalline, whereas its inner region of the composite remained amorphous.     

Viscoelastic properties and coating performance of acrylic copolymers crosslinked with melamine resin

For 8 carboxy and hydroxy functional acrylic copolymers crosslinked with melamine resin, glass transition temperature (T_g), molecular weight of chain segments between crosslinked point (M_c), and polymer-solvent interaction parameters (χ_g ) were determined by dynamic mechanical measurements and swelling measurements. T_g increases and M_c decreases with the increase of hydroxyl value and the molecular weight of acrylic copolymers. T_g decreases and M_c increases with the increase of alkyl chain length of acrylate in acrylic copolymers. The film hardness, T_g and polarity of methyl methacrylate (MMA) containing acrylic-melamine-cured films are higher than those of styrene-containing acrylic-melamine-cured films, but both films are almost the same in the degree of crosslinking (maximum loss tangent, tan δ_max, and M_c). T_g increases and M_c decreases with the increase of melamine resin content for acrylic-melamine coatings. The cured film consists of the acrylic-melamine segments and the melamine-melamine segments at crosslinking points. The carboxy group enhances the crosslinking reactions at low temperatures. All films crosslinked have single glass transition temperatures and broad damping peaks, which show good compatibility. The values of χ_g of acrylic copolymer-melamine films in polar and nonpolar solvents depend on the polarity of acrylic composition and the degree of crosslinking. χ_g values of carboxy functional acrylic-melamine film in any solvents are smaller than that of carboxy and hydroxy functional acrylic-melamine film. χ_g values of MMA-containing acrylic-melamine film in polar solvents are smaller than those of styrene-containing acrylic-melamine film, but χ_g values of MMA-containing acrylic-melamine film in nonpolar solvents are larger than those of styrene-containing acrylic-melamine film. χ_g values of acrylic-melamine film in polar and nonpolar solvents increase with the increase of alkyl chain length of acrylate. The χ_g values of acrylic-melamine coatings in toluene are less than 0.3 and smaller than those of alkyd coatings.     

一种新型光固化防雾涂料

固体材料表面上的雾化现象,对光学器件、农业用透明塑料薄膜、太阳能电池透光板等产品的应用产生严重影响。介绍了一种新型超亲水纳米二氧化硅微粒UV防雾涂料,可在高速生产状态下实现卷对卷塑料基材涂层瞬时UV固化,同时保持塑料基材的良好光学透明性。     

一种新型防水涂料的制备

实验采用氢化C5石油树脂作为成膜物质制备新型防水涂料.通过对乳化剂的筛选和物料配比的考查,确定了制备乳液的最佳条件,并通过对其它助剂加入量的考察,确定了防水涂料的最佳配方.实验结果表明,当乳化剂选用复配型乳化剂,m(氢化C5石油树脂):m(石蜡)=2:1时,制备的乳液效果最好;当m(氢化C5石油树脂乳液):m(涂料)=...     

热反射隔热外墙涂料的制备和性能测试

本文系统的研究了单双两种组分的反射隔热涂料,具体分析了不同树脂固化剂及不同体系的填料及其掺量等因素对涂料的一些基础性能,如耐水性,耐玷污性及对反射隔热性能的影响。最终通过暴晒实验确定性能最为优异的反射隔热涂料。     

高温红外低发射率涂层性能研究

针对装备高温部位红外隐身需求,本论文结合大气等离子喷涂和丝网印刷-烧结工艺制备高温红外低发射率涂层。经过900℃和1100℃耐温性试验后,涂层高温红外发射率变化较小,表面未出现裂纹、脱落等缺陷,表明涂层可在900℃下长时使用,短时耐温达到1100℃。并且涂层表现出优异的低发射率特性,具有较好的工程化应用前景。