Microstructure and optical properties of Co-WC-Al 2 O 3  duplex ceramic metal-dielectric solar selective absorbing coating prepared by high velocity oxy-fuel spraying and sol-gel method

Duan, Xiaohua; Zhang, Xuemin; Ke, Chengzhu; Jiang, S. J.; Wang, Xiaobo; Li, Shulin; Guo, Weiyang

doi:10.1016/j.vacuum.2017.09.002

Cited by 22 publications

(5 citation statements)

References 31 publications

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“…However, the layers protect the WC/Co by diffusion of oxygen, giving the good thermal stability observed, but lower the emittance and improve the selectivity of the coating (see Figure 7). A similar strategy has been proposed by Duan et al [43] that investigated a tandem structure (see Figure 8b) made by WC/Co absorber coating manufactured by HVOF process plus an aluminum oxide (Al 2 O 3 ) anti-reflection layer (ARC), produced by the sol-gel method. The tandem structure presents a good selectivity with α/ε equal to 0.908/0.145 and good stability (0.898/0.172) after annealing at 600 • C for 7 days.…”

Section: Thermal Spray Processes For Selective Absorbermentioning

confidence: 99%

“…From the analyzed contributions, it emerges that laser processing is a potential alternative to vacuum techniques and conventional thermal spray processes. Optimization of processing parameters and adoption of a multilayer approach, as also seen in [35,43], including, for example, anti-reflection layers, could further improve the optical properties and the selectivity. However, some doubts about the cost-effectiveness of these solutions remain undebated.…”

Section: Thermal Spray Processes For Selective Absorbermentioning

confidence: 99%

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Thermal Spray Processes in Concentrating Solar Power Technology

Rubino

Poza

Pasquino

et al. 2021

Metals

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Solar power is a sustainable and affordable source of energy, and has gained interest from academies, companies, and government institutions as a potential and efficient alternative for next-generation energy production. To promote the penetration of solar power in the energy market, solar-generated electricity needs to be cost-competitive with fossil fuels and other renewables. Development of new materials for solar absorbers able to collect a higher fraction of solar radiation and work at higher temperatures, together with improved design of thermal energy storage systems and components, have been addressed as strategies for increasing the efficiency of solar power plants, offering dispatchable energy and adapting the electricity production to the curve demand. Manufacturing of concentrating solar power components greatly affects their performance and durability and, thus, the global efficiency of solar power plants. The development of viable, sustainable, and efficient manufacturing procedures and processes became key aspects within the breakthrough strategies of solar power technologies. This paper provides an outlook on the application of thermal spray processes to produce selective solar absorbing coatings in solar tower receivers and high-temperature protective barriers as strategies to mitigate the corrosion of concentrating solar power and thermal energy storage components when exposed to aggressive media during service life.

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Section: Thermal Spray Processes For Selective Absorbermentioning

confidence: 99%

Section: Thermal Spray Processes For Selective Absorbermentioning

confidence: 99%

Thermal Spray Processes in Concentrating Solar Power Technology

Rubino

Poza

Pasquino

et al. 2021

Metals

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“…After being annealed in the nonvacuum environment, the absorption and emittance of the multilayered coatings’ stack changed to 0.901/0.320. Using similar composite coating preparation method, Duan et al (2017) [ 97 ] investigated solar‐selective absorbing properties of duplex Co–WC–Al 2 O 3 (absorbing layer using HVOF method) and Al 2 O 3 (antireflection layer using sol–gel method) ceramic metal–dielectric. The coating exhibited high solar absorptance/emittance (0.908/0.145).…”

Section: Electromagnetic Wave Propagation Characteristics Of Thermal ...mentioning

confidence: 99%

Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

et al. 2022

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This review aims to consolidate scattered literature on thermally sprayed coatings with nonionizing electromagnetic (EM) wave absorption and shielding over specific wavelengths potentially useful in diverse applications (e.g., microwave to millimeter wave, solar selective, photocatalytic, interference shielding, thermal barrier‐heat/emissivity). Materials EM properties such as electric permittivity, magnetic permeability, electrical conductivity, and dielectric loss are critical due to which a material can respond to absorbed, reflected, transmitted, or may excite surface electromagnetic waves at frequencies typical of electromagnetic radiations. Thermal spraying is a standard industrial practice used for depositing coatings where the sprayed layer is formed by successive impact of fully or partially molten droplets/particles of a material exposed to high or moderate temperatures and velocities. However, as an emerging novel application of an existing thermal spray techniques, some special considerations are warranted for targeted development involving relevant characterization. Key potential research areas of development relating to material selection and coating fabrication strategies and their impact on existing practices in the field are identified. The study shows a research gap in the feedstock materials design and doping, and their complex selection covered by thermally sprayed coatings that can be critical to advancing applications exploiting their electromagnetic properties.

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“…The technology of generating electricity for thermal energy shows great application prospects. , Selective absorption coating is the core material of solar collectors. The coating needs to have a high absorptivity (α) in the solar spectral range of 0.3–2.5 μm, a low thermal emissivity (ε) in the infrared region of 2.5–25 μm, and excellent optical stability and corrosion resistance at high temperatures. − The types of solar absorption coatings include intrinsic absorption coatings, optical interference coatings, dielectric-metal composite coatings, and optical trap coatings. − Recently, the optical interference coatings with multilayer cermet structures, such as Co-WC-Al 2 O 3 , TiC-Al 2 O 3 , WNi-Al 2 O 3 , and WTi-Al 2 O 3 , have become the research focus because of excellent optical properties. − However, the atomic diffusion between the layers of the traditional multilayer solar absorption coating destroys the multilayer structure at high temperatures, resulting in a significant reduction in the light interference absorption efficiency, making it less stable at high temperatures . In addition, due to the weather environment such as rain and snow, the corrosion resistance is crucial for the long-term application of the coating, which directly affects the service life of the coating …”

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Weather Resistance of a Bionic Lotus Multiscale Micro–Nanostructure TiC/TiN–Ni/Mo Spectral Selective Absorber Based on Laser Cladding-Induced Melt Foaming

Pang,

Li,

Gao

et al. 2024

ACS Appl. Mater. Interfaces

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As the core of a solar collector, a solar selective absorbing coating has become the key material for efficient utilization and development of solar energy. In order to overcome the core scientific problem of poor hightemperature stability of optical properties caused by atomic diffusion between layers in the high-temperature environment of traditional multilayer solar absorption coatings, the multiscale lotus bionic porous structure was constructed by using a TiC/TiN−Ni/Mo material system with excellent intrinsic absorption performance. The melt foam method and laser cladding technology were combined to deposit the multiscale bionic porous structure solar selective absorption coating in situ by a laser-induced melt foaming strategy. It was found that the bubbles in the molten pool were affected by Marangoni force, gravity, buoyancy, and surface tension. The unescaped bubbles formed pores near the surface of the coating and showed a bimodal distribution. For the multiscale addition of 1.8 and 0.4 μm pore-forming agents with a mass fraction of 15 wt %, the multiscale pores enhance the scattering and secondary absorption of light and reduce the amplitude of electromagnetic wave to electron vibration; at the same time, the small-size conductor effect formed by the hole increases the surface electron concentration, strengthens the absorption of light, and enhances the magnetic field strength at the hole, and the structural absorbing effect is significant. The coating absorptivity α reaches 85%, and the temperature stability is excellent. Compared with the substrate, the coating has a smaller corrosion current density, larger polarization resistance, and strong corrosion resistance. The research shows that the laser-induced multiscale bionic porous structure coating obtains the intrinsic absorption-structural absorption composite absorption mechanism and realizes the integration of flexible design and efficient manufacturing of high-temperature solar absorption coatings.

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Microstructure and optical properties of Co-WC-Al 2 O 3 duplex ceramic metal-dielectric solar selective absorbing coating prepared by high velocity oxy-fuel spraying and sol-gel method

Cited by 22 publications

References 31 publications

Thermal Spray Processes in Concentrating Solar Power Technology

Thermal Spray Processes in Concentrating Solar Power Technology

Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

Thermal Stability and Weather Resistance of a Bionic Lotus Multiscale Micro–Nanostructure TiC/TiN–Ni/Mo Spectral Selective Absorber Based on Laser Cladding-Induced Melt Foaming

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