Enhancement of high-temperature stability of solar absorber coatings on metallic substrates through diffusion barriers

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2025-04-03 DOI:10.1016/j.surfcoat.2025.132120

C.I. Parra-Montero , T.C. Rojas , R. Escobar-Galindo , J.C. Sánchez-López

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Abstract

The high-temperature stability of solar absorber paints is critical for the efficiency of concentrating solar power systems, particularly central towers operating at ∼800 °C, where ion interdiffusion at the coating/substrate interface is significant. This work examines the effect of a diffusion barrier (DB) formed by controlled surface oxidation of stainless steel 316L (SS316) and Inconel 625 (INC625) at 800 °C to improve the thermal stability and optical performance. A CrAlSiN/AlSiO solar absorber tandem structure was deposited on oxidized and unoxidized substrates, with their stability compared after annealing at 800 °C for 2 h. The presence of the DB layer resulted in improved thermal stability and optical performance, with post-annealing absorptance values of 0.953 (SS316) and 0.949 (INC625), surpassing those of the reference samples, without the diffusion barrier (0.932 and 0.901, respectively). Microstructural and spectroscopic analyses confirmed the effectiveness of the DB, highlighting its potential for advanced concentrating solar power applications.

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通过扩散屏障增强金属基底上太阳能吸收膜的高温稳定性

太阳能吸收涂料的高温稳定性对聚光太阳能发电系统的效率至关重要，特别是在~ 800°C下运行的中央塔，在那里涂层/衬底界面的离子互扩散是重要的。这项工作考察了扩散屏障（DB）在800°C下通过控制不锈钢316L （SS316）和Inconel 625 （INC625）的表面氧化形成的影响，以改善热稳定性和光学性能。在氧化和未氧化的基底上沉积了CrAlSiN/AlSiO太阳能吸收体，在800℃退火2 h后，比较了它们的稳定性。DB层的存在提高了热稳定性和光学性能，退火后的吸光度值为0.953 （SS316）和0.949 (INC625)，超过了没有扩散阻挡的参考样品（分别为0.932和0.901）。微观结构和光谱分析证实了DB的有效性，突出了其在先进聚光太阳能应用中的潜力。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.