1种低红外发射率涂层耐热性能研究

Thermal Stability of a Low Infrared Emissivity Coating

为有效降低飞行器高温部位表面的红外发射率,以改性有机硅为黏结剂体系、金属铝粉为主要填料,制备了在8～14μm波段具有较低红外发射率的涂层。在50～400℃温度范围内考察了涂层的耐热性能,并采用扫描电镜、TGA等手段对其进行表征,研究了涂层的红外发射率、光泽度和力学性能随温度的变化规律及影响机理。结果表明：制备的涂层在300℃以下具有良好的力学性能,可长期使用,在8～14μm波段的红外发射率与温度成反比,光泽度与温度成正比;当环境温度高于300℃,涂层开始发生热降解现象,光泽度降低,涂层的力学性能降低。

In order to efficiently decrease infrared emissivity on surface of aircraft high temperature position,the low infrared emissivity coatings at 8～14μm were prepared by using modified silicone and Aluminum powder as binder and pigment,respectively.The thermal stability and infrared emissivity of the coatings was researched,and the influence of temperature on the gloss and mechanical properties of coatings was investigated with scanning electron microscopy and thermo gravimetric analysis.The results indicate that good mechanical properties of the coatings are reserved under 300 degrees,and the infrared emissivity is inversely related to the temperature,while the gloss is proportionate to the temperature.The thermal degradation happened and the gloss went down and the mechanical properties reduced when the environment temperature is higher than 300 ℃.