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Black Coatings

The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform

Schlomo Magdassi – 1st expert on this subject based on the ideXlab platform

  • Formation and performance of highly absorbing solar thermal coating based on carbon nanotubes and boehmite
    Energy Conversion and Management, 2016
    Co-Authors: Raj Kumar Bera, Subodh Gautam Mhaisalkar, Daniel Mandler, Schlomo Magdassi

    Abstract:

    A major component of solar thermal systems is the solar absorber, which converts light into heat. We report on achieving high absorptance, excellent adhesion, and high thermal stability of carbon nanotube-based Black Coatings by applying a layer of Boehmite (AlOOH) on top of the carbon nanotube (CNT) film by solution-processed spray deposition. The CNT layer made-up by spraying, functions as an absorbing layer and the AlOOH serves as an anti-reflecting and protecting film. The anti-reflecting property of AlOOH layer effectively increases the absorptance of CNT coating by decreasing the reflectance. The effect of the thickness of AlOOH layer on the absorptance, adhesion, and thermal stability of the resulting CNT/AlOOH coating was investigated. The CNT/AlOOH coating with optimized thickness of AlOOH layer shows very high absorptance (α) of 0.975. The adhesion of the coating is in the range of 95-100% with significant increase of thermal stability. This new approach is expected to open new possibilities for fabricating low-cost, highly efficient and thermally stable solar-thermal devices which are based on simple coating processes.

  • wet deposition of carbon nanotube Black Coatings for stray light reduction in optical systems
    Surface & Coatings Technology, 2015
    Co-Authors: Suzanna Azoubel, Rina Cohen, Schlomo Magdassi

    Abstract:

    Abstract Stray light, also known as optical noise, affects the performance of many optical devices. It can be reduced to a tolerable level by well-designed and well-baffled system or/and by using functional Black Coatings that are fabricated in a complex and costly process. Carbon nanotubes (CNTs) absorb light strongly, making them an ideal candidate for realizing a super Black coating. CNT Coatings were formed by spraying formulations composed of a silicon binder and low cost multiwalled CNTs on a pre-heated aluminum plate. The diffuse reflectance of the Coatings in the VIS range (350–800 nm) was in the range of 2.6–5.11%, depending on the MWCNT concentration in the coating. In the NIR range (850–2400 nm), the reflectance values were in the range of 4–6.5%, however the dependence on MWCNT concentration was not very significant. Excellent adhesion to the aluminum substrates was achieved, for Coatings with CNT concentration below 15%, while still having very low reflectance, even at temperature cycling between 200 °C and − 196 °C. The proposed coating formulations enable simple and low cost approach for producing high light-absorbing coating of complex 3D structures within a very short time by wet deposition of CNTs.

Masoud Barekat – 2nd expert on this subject based on the ideXlab platform

  • Wear behavior of silicone rubber/carbon Black Coatings on 6061 aluminum alloy surfaces
    Progress in Organic Coatings, 2020
    Co-Authors: Masoud Barekat, Reza Shoja Razavi, Saeed Bastani

    Abstract:

    Abstract In this paper, the effects of structural and process variables on wear resistance of silicone rubber/carbon Black Coatings on 6061 aluminum alloy surfaces are studied. Testing parameters have been optimized for maximum wear resistance based on taguchi orthogonal design with six important parameters, viz. polydimethylsiloxane (PDMS) molecular weight, oxime/OH ratio, catalyst weight percent, pigment weight percent, surface preparation method and adhesion promoter type. The analysis of variance showed that the wear resistance strongly depends on oxime/OH ratio and catalyst weight percent. PDMS molecular weight and pigment weight percent also have intermediate effects. Neither the surface preparation method nor adhesion promoter type had any effects on wear resistance in this study. The optimum sample was prepared according to the best levels of each factor and the wear resistance in optimum conditions was reasonably in agreement with the experimental data. Scanning electron microscopy analysis of wear surface and debris showed two mechanisms: cohesive wear with fatigue mechanism and interfacial wear with adhesion mechanism.

  • wear behavior of polyurethane carbon Black Coatings on 6061 aluminum alloy substrates
    Progress in Organic Coatings, 2016
    Co-Authors: Seyyed Saber Mirhosseini, Reza Shoja Razavi, Mehrdad Taheran, Masoud Barekat

    Abstract:

    Abstract In this paper, the effects of structural and process variables on wear resistance of polyurethane/carbon Black Coatings on the 6061 aluminum substrate are studied. These Coatings are widely used in different industries because of their outstanding thermal, chemical stabilities and excellent mechanical properties. The parameters were polyol type (ester or ether), NCO/OH ratio and pigment concentration. The experiments were carried out based on the design of experiments using Taguchi method. Abrasion resistance tests were performed with a Taber Abrasion test device, and its morphology was examined by scanning electron microscopy (SEM). Fourier-transform infrared (FTIR) spectroscopy was used to characterize the synthesized polymer. The analysis of variance showed that among the studied parameters, polyol type and pigment concentration have the most significant effects on wear resistance. Coating with polyester polyol increases the wear resistance due to possible hydrogen bonding between hard and soft segments. Furthermore, the pigment particles provide equivalent physical crosslinks, so it increases the wear resistance. Finally, the coated sample including polyester polyol, 12phr carbon Black and NCO/OH ratio equal to 1.4, provide the best wear resistance i.e. 0.2 mg. Also, the results showed that abrasion and cohesive wear are the dominant mechanisms for describing the wear behavior of studied Coatings.

  • Wear behavior of polyurethane/carbon Black Coatings on 6061 aluminum alloy substrates
    Progress in Organic Coatings, 2016
    Co-Authors: Seyyed Saber Mirhosseini, Reza Shoja Razavi, Mehrdad Taheran, Masoud Barekat

    Abstract:

    Abstract In this paper, the effects of structural and process variables on wear resistance of polyurethane/carbon Black Coatings on the 6061 aluminum substrate are studied. These Coatings are widely used in different industries because of their outstanding thermal, chemical stabilities and excellent mechanical properties. The parameters were polyol type (ester or ether), NCO/OH ratio and pigment concentration. The experiments were carried out based on the design of experiments using Taguchi method. Abrasion resistance tests were performed with a Taber Abrasion test device, and its morphology was examined by scanning electron microscopy (SEM). Fourier-transform infrared (FTIR) spectroscopy was used to characterize the synthesized polymer. The analysis of variance showed that among the studied parameters, polyol type and pigment concentration have the most significant effects on wear resistance. Coating with polyester polyol increases the wear resistance due to possible hydrogen bonding between hard and soft segments. Furthermore, the pigment particles provide equivalent physical crosslinks, so it increases the wear resistance. Finally, the coated sample including polyester polyol, 12phr carbon Black and NCO/OH ratio equal to 1.4, provide the best wear resistance i.e. 0.2 mg. Also, the results showed that abrasion and cohesive wear are the dominant mechanisms for describing the wear behavior of studied Coatings.

Juan R. Reveles – 3rd expert on this subject based on the ideXlab platform

  • The partial space qualification of a vertically aligned carbon nanotube coating on aluminium substrates for EO applications
    Optics Express, 2014
    Co-Authors: E Theocharous, Nigel Fox, Christopher J. Chunnilall, Ryan Mole, David Gibbs, Naigui Shang, Guy Howlett, Ben Jensen, Rosie Taylor, Juan R. Reveles

    Abstract:

    The fabrication of NanoTube Black, a Vertically Aligned carbon NanoTube Array (VANTA) on aluminium substrates is reported for the first time. The coating on aluminium was realised using a process that employs top down thermal radiation to assist growth, enabling deposition at temperatures below the substrate’s melting point. The NanoTube Black Coatings were shown to exhibit directional hemispherical reflectance values of typically less than 1{%} across wavelengths in the 2.5 µm to 15 µm range. VANTA-coated aluminium substrates were subjected to space qualification testing (mass loss, outgassing, shock, vibration and temperature cycling) before their optical properties were re-assessed. Within measurement uncertainty, no changes to hemispherical reflectance were detected, confirming that NanoTube Black Coatings on aluminium are good candidates for Earth Observation (EO) applications.