Abstract In this study, low infrared emissivity coatings with good thermal stabilities were fabricated using silicone resin as adhesive, flake aluminum powder as pigment, and low-melting glass powder as functional filler. The effects of the low-melting glass powder on the adhesions, thermal expansions, and infrared emissivity of the coatings were systematically investigated. In addition, the surface microstructures and thermal stability mechanisms of the coatings were analyzed in detail. Mechanical tests showed that the addition of the low-melting glass powder to the Al/polysiloxane coating enhanced its adhesion after a high-temperature treatment due to the mechanical interlocking of the particles by the secondary film-forming low-melting glass. Thermal analysis indicated that the oxidation resistance of the coating could be improved by the film-forming low-melting glass powder. The low-emissivity coating with a low-melting glass powder content of approximately 15 wt.% and Al/polysiloxane ratio of 1.5 exhibited good thermal stability. The adhesion of the coating increased to 9.0 ± 0.4 MPa after heating at 500 °C. When the content of the low-melting glass was increased from 0 to 15 wt.%, the oxidation exothermic peak of the coating shifted from 590 to 625 °C at a pigment/binder ratio of 1.5. The infrared emissivity of the coating was 0.25 after heating at 600 °C.

中文翻译：

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低熔点玻璃粉对低红外辐射铝/聚硅氧烷涂层热稳定性的影响

摘要 本研究以有机硅树脂为粘合剂，片状铝粉为颜料，低熔点玻璃粉为功能填料，制备了具有良好热稳定性的低红外辐射涂料。系统地研究了低熔点玻璃粉对涂层的附着力、热膨胀和红外发射率的影响。此外，还详细分析了涂层的表面微观结构和热稳定性机理。机械测试表明，由于颗粒与二次成膜低熔点玻璃的机械互锁，将低熔点玻璃粉末添加到铝/聚硅氧烷涂层中可增强高温处理后的附着力。热分析表明，成膜低熔点玻璃粉可以提高涂层的抗氧化性。低熔点玻璃粉末含量约为 15 wt.% 且铝/聚硅氧烷比为 1.5 的低辐射涂层表现出良好的热稳定性。在 500 °C 加热后，涂层的附着力增加到 9.0 ± 0.4 MPa。当低熔点玻璃的含量从 0 重量％增加到 15 重量％时，当颜料/粘合剂比为 1.5 时，涂层的氧化放热峰从 590°C 移至 625°C。在 600 °C 加热后，涂层的红外发射率为 0.25。在 500 °C 加热后，涂层的附着力增加到 9.0 ± 0.4 MPa。当低熔点玻璃的含量从 0 重量％增加到 15 重量％时，当颜料/粘合剂比为 1.5 时，涂层的氧化放热峰从 590°C 移至 625°C。在 600 °C 加热后，涂层的红外发射率为 0.25。在 500 °C 加热后，涂层的附着力增加到 9.0 ± 0.4 MPa。当低熔点玻璃的含量从 0 重量％增加到 15 重量％时，当颜料/粘合剂比为 1.5 时，涂层的氧化放热峰从 590°C 移至 625°C。在 600 °C 加热后，涂层的红外发射率为 0.25。