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<p>The femtosecond laser processing of silicon carbide (SiC) ceramics induces concurrent ablation and vaporization mechanisms, leading to the formation of ablation by-products. In this study, SiC/SiO<sub>2</sub> powder coatings were prepared by constructing a powder collection chamber with acrylic plates and irradiating SiC ceramics using a high-frequency femtosecond laser under varied gas environments (static air, air-blowing, and nitrogen-blowing). The effects of these environments on the coatings’ microstructure, chemical composition, and optical properties were systematically investigated. Experimental results indicated that the powder coatings deposited on acrylic plates exhibited a porous, layered honeycomb-like structure. Coatings prepared under nitrogen-blowing or air-blowing conditions displayed smaller particle sizes and higher density compared to those formed in a static air environment. Visible-near infrared spectroscopy analysis demonstrated that the nitrogen-blown coatings exhibited optimal optical performance, with reflectivity below 3%, transmittance exceeding 95%, and absorptivity under 3% across the 700–1500&#xa0;nm wavelength range. This enhancement is attributed to reduced light scattering interfaces due to the compact microstructure and the infiltration of SiC nanoparticles into interstitial pores within the SiO₂ matrix, which further minimized scattering losses. These findings highlight the significant potential of such coatings for applications in infrared window materials, stealth technology for unmanned aerial vehicles (UAVs), and spacecraft thermal control systems.</p>

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Influence of different gas environments on the morphology and optical properties of SiC/SiO2 powder coatings prepared by femtosecond laser

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Zixuan Qie,
  • Yuchen Lou,
  • Xifang Zhang,
  • Zhenqiang Yao

摘要

The femtosecond laser processing of silicon carbide (SiC) ceramics induces concurrent ablation and vaporization mechanisms, leading to the formation of ablation by-products. In this study, SiC/SiO2 powder coatings were prepared by constructing a powder collection chamber with acrylic plates and irradiating SiC ceramics using a high-frequency femtosecond laser under varied gas environments (static air, air-blowing, and nitrogen-blowing). The effects of these environments on the coatings’ microstructure, chemical composition, and optical properties were systematically investigated. Experimental results indicated that the powder coatings deposited on acrylic plates exhibited a porous, layered honeycomb-like structure. Coatings prepared under nitrogen-blowing or air-blowing conditions displayed smaller particle sizes and higher density compared to those formed in a static air environment. Visible-near infrared spectroscopy analysis demonstrated that the nitrogen-blown coatings exhibited optimal optical performance, with reflectivity below 3%, transmittance exceeding 95%, and absorptivity under 3% across the 700–1500 nm wavelength range. This enhancement is attributed to reduced light scattering interfaces due to the compact microstructure and the infiltration of SiC nanoparticles into interstitial pores within the SiO₂ matrix, which further minimized scattering losses. These findings highlight the significant potential of such coatings for applications in infrared window materials, stealth technology for unmanned aerial vehicles (UAVs), and spacecraft thermal control systems.