Effects of substrate roughness on infrared-emissivity characteristics of Au films deposited on Ni alloy


Zhibin Huang, Wancheng Zhou, Xiufeng Tang, Dongmei Zhu, Fa Luo, State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechincial University, Xi’an 710072, China


Low-emissivity Au films were sputter-deposited on three groups of nickel alloy substrates with different surface roughness. The gold-coated samples were then heated in the air at 600℃ for 200h to simulate the exposure of use environment. The results showed that the substrate roughness had great influences on the integrity of the Au film, which directly affect the infrared characteristics of the sample. After heat treatment, the average infrared emissivity of the samples with small roughness just little increased, while it increased greatly of the samples with large roughness. Moreover, the Au films on the samples with small roughness exhibited better resistance against oxidation.


Low-emissivity layers, Au films, substrate roughness


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