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脉冲电沉积纳米镍-碳化硅复合镀层的性能 总被引:1,自引:0,他引:1
分别采用直流(DC)和换向脉冲电流(PRC)电沉积法制得纳米Ni-SiC复合镀层。采用X射线衍射仪、扫描电镜、能谱仪对比研究了纯Ni镀层和Ni-SiC复合镀层的微观结构、宏观残余应力、表面形貌及成分。用浸泡法研究了不同镀层在3.5%(质量分数)NaCl和10%(体积分数)H2SO4溶液中的腐蚀行为。结果表明,脉冲电沉积能改变镀层的微观结构,有效提高镀层硬度,降低宏观残余应力。脉冲电沉积所得到的纯Ni镀层和纳米Ni-SiC复合镀层在3.5%NaCl及10%H2SO4溶液中的耐蚀性均优于直流镀层。脉冲镀层在3.5%NaCl溶液中受腐蚀很轻,主要腐蚀形态为点蚀,而在10%H2SO4溶液中,SiC粒子作为增强相使镀层的耐腐蚀性进一步提高。 相似文献
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镍基纳米复合镀层的研究进展 总被引:2,自引:0,他引:2
综述了镍基纳米复合镀层的研究现状。阐述了复合镀层的沉积机理、纳米微粒在复合镀层中的作用机理、纳米微粒在镍基镀液中的分散以及镍基纳米复合镀层的种类和性能。指出了纳米复合镀技术研究中存在的问题和发展方向。 相似文献
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先采用电泳沉积工艺在紫铜表面均匀沉积粒径为20 nm的Al2O3薄膜,然后通过电沉积在Al2O3沉积层表面得到Ni–Co合金,最终得到具有较高Al2O3含量的Ni–Co–Al2O3纳米复合镀层。采用扫描电镜和能谱仪分析了复合镀层的微观形貌和组成,并研究了镀层中Al2O3含量对镀层显微硬度和耐磨性的影响。结果表明,通过改变电泳沉积时间可制得Al2O3含量不同的Ni–Co–Al2O3复合镀层。Ni–Co–Al2O3复合镀层的综合性能优于Ni–Co合金镀层和Ni–Al2O3复合镀层。当复合镀层中纳米Al2O3粒子的体积分数约为30%(电泳沉积时间120 s)时,镀层组织致密,显微硬度较高,耐磨性最佳。 相似文献
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水性纳米复合隔热涂料的研制 总被引:2,自引:0,他引:2
以纳米ATO(掺锑二氧化锡)浆料和纳米TiO2粉体配合高反射与高辐射性能的颜填料,制备了一种水性纳米复合隔热涂料.乳液、颜料和填料筛选实验表明,聚合物乳液种类对涂层隔热性能几乎没有影响;颜料中,金红石型二氧化钛是性能最好的反射填料,其用量在PVC=18%时,涂层隔热性能最好;绢云母具有一定的辐射隔热效果,当其质量分数为11%时,涂层性能最忧,辐射率可达0.86;纳米ATO浆料具有良好的隔热效果,其最佳用量为10%.当以质量比为1:2的添加量将纳米ATO和纳米TiO2加入到涂料中,所得涂层在全波段(200~2 500 nm)的太阳热反射比为86%,辐射率为0.86. 相似文献
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Hydrophilic coatings based on 3‐glicidoxy propyl trimethoxy silane (GPTMS) and polyethylene glycol (PEG) were prepared with the incorporation of tetramethoxysilane (TMOS) and silica nanoparticle colloidal suspension by a sol–gel process. Characterization of the coatings has been performed by Fourier Transform Infrared (FTIR) and Attenuated Total Reflectance Infrared (ATR‐IR) techniques. Morphological properties were characterized by Scanning Electron Microscopy (SEM). The distribution of Si atoms in the hybrid system was obtained by Si mapping. The particle size in sol solution of the coating was measured by light scattering analyzer. Optical properties were characterized by using UV–vis spectrophotometer. The hydrophilicity of the coating was determined by contact angle measurements, and also the results have been confirmed by surface energy and water uptake investigations. The obtained results indicate that the surfactants affected the contact angles remarkably but did not change the transparency. It has been found that applying silica nano particles leads to coatings with different properties than those using TMOS, while siloxane contents were the same in these two set of coatings. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5322–5329, 2006 相似文献
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《国际智能与纳米材料杂志》2013,4(3):120-133
In this study, multifunctional carbon nanofiber (CNF) paper-based nanocomposite coating was developed for wind turbine blades. The importance of vibration damping in relation to structural stability, dynamic response, position control, and durability of wind turbine blades cannot be underestimated. The vibration damping properties of the nanocomposite blades were significantly improved and the damping ratio of the nanocomposite increased by 300% compared to the baseline composite. In addition, the CNF paper-based composite exhibited good impact-friction resistance, with a wear rate as low as 1.78×10?4mm3/Nm. The nanocomposite also shows the potential to improve the blockage of water from entering the nanocomposite, being a superhydrophobic material, with a contact angle higher than 160.0°, which could improve the longevity of a wind turbine blade. Overall, multifunctional nanocomposite coating material shows great promise for usage with wind turbine blades, owing to its excellent damping properties, great friction resistance, and superhydrophobicity. 相似文献
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Monotungsten carbide and titania nanocomposite with core-shell(WC@TiO2)structure was prepared by a new approach of spray drying and reduction-carbonization reaction,with titania nanopowder and ammonium metatungstate as precursors,methane as carbon source,and hydrogen as reduction gas.The sample was characterized by X-ray diffraction,scanning electron microscope,high resolution transmission electron microscope and X-ray energy dispersion spectroscopy.The results show that its crystal phase is composed of brookite,tungsten and monotungsten carbide.The morphology of the sample particle is irregular sphere-like,with a diameter smaller than 100 nm.Its chemical components are titanium,tungsten,carbon and oxygen.Monotungsten carbide nanoparticles lie on the surface of titania core and form an incomplete shell around titania core in the nanocomposite.The measurement with a microelectrode system of three electrodes shows that the sample is electrocatalytic active to nitrophenol in basic solution at room temperature.Its peak potential is at0.988 V(vs saturated calomel electrode (SCE)),which is more negative than the peak potential,0.817 V(vs SCE),of mesoporous monotungsten carbide, and its peak current is 8.809μA,which is higher than the peak current,4.058μA,of mesoporous monotungsten carbide.The hydrogen generation potential of the sample is at1.199 V(vs SCE),which is more negative than that of pure nanosized monotungsten carbide at1.100 V(vs SCE).These results show that the presence of titania in the sample can lower the peak potential of nitrophenol electrocatalysis and its hydrogen generation potential,and increase its peak current of nitrophenol electrocatalysis in basic solution at room temperature.This indicates a synergistic effect of titania and monotungsten carbide in electrocatalysis. 相似文献