电沉积法制备碳纳米管/黑镍复合涂层的光学与结构特性

利用复合电沉积的方法在钛合金基体上成功制备出具有优异光学性能的碳纳米管／黑镍复合涂层, 并研究了复合涂层的微观形貌、光学性能以及镀液中碳纳米管浓度和电镀电流密度对光学性能的影响。实验结果表明: 相较于传统电镀方法获得的单一黑镍涂层, 复合涂层的晶粒尺寸明显减小, 形成多孔结构, 表面粗糙程度明显增加。复合涂层对300~2300 nm范围内的入射光吸收率达到98%左右, 在2.5~20 μm范围内的红外吸收率达到94%, 远远高于传统单一黑镍涂层。复合涂层的太阳吸收比会随着镀液中碳纳米管浓度与电镀电流密度的增加呈先增大后减小的变化规律。

Optical and Structural Properties of Carbon Nanotubes/Black Nickel Composite Coatings by Electrodeposition

Carbon nanotubes/black nickel composite coatings with high optical properties on titanium alloy substrate were prepared on the basis of composite electrochemical deposition methods. Micro scale morphology and optical properties of as-prepared materials were analyzed. The effects of carbon nanotubes concentration and electroplating current density on the optical properties were also explored. The results show that grain size of composite coating was small with microporous and increased surface roughness as compared with conventional black nickel coating. The absorptance (α_s) over a spectral range of 300-2300 nm was up to 98%, while the emittance (ε) over a 2.5 µm to 20 µm range was 94%, better than those of conventional black nickel coatings. The absorptance of composite coating increased firstly and then decreased with increase of carbon nanotubes concentration and electroplating current density.