Thermal ageing studies on low infrared emissivity composite coatings

• Published in: Journal of alloys and compounds Vol. 496; no. 1; pp. 691 - 694
• Main Authors: Hu, Chen, Xu, Guoyue, Shen, Xingmei, Huang, Rong, Li, FengLei
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 30.04.2010; Elsevier
• Subjects: Aging; Aluminum; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Emissivity; Exact sciences and technology; Infrared; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Polymers; Polysiloxanes; Quenching; Radiation effects; Resistivity; Roughness; SEM; Surface structure; Thermooptical and photothermal effects; X-ray diffraction; X-ray diffraction; Radiation effects; SEM; Polymers; Quenching; Scanning electron microscopy; Electrical conductivity; Thermal ageing; Surface morphology; Roughness; Aluminium; XRD; Emissivity; Composite coating; Oxidation; Silicones
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2010.02.172

The emissivity property of low infrared emissivity coatings was studied during the thermal ageing. The influence of roughness, surface structure and electrical conductivity on infrared emissivity was systematically investigated. The results of experimental investigation indicate that the infrared emissivity changes with roughness, surface structure and conductivity during thermal ageing. This effect was explained by thermal oxidation of Al particles and polysiloxane degradation in the composite coatings and confirmed by SEM and XRD. Due to the degradation of polysiloxane and oxidation of Al particles, roughness increases, surface structure forms cracks and gaps, and conductivity reduces obviously with different temperature, which leads to significantly increasing emissivity.