Application of low-emissivity Pt layer on Ni alloy to high temperature

摘要

Platinum films were sputter-deposited on two groups of nickel alloy substrates,in which the first group was the samples with rough surface,and the other group with polished surface.The platinum thin-films were applied to serve as the low-emissivity layers to reflect thermal radiation.Then,the platinum-coated samples were heated in air at 600℃ for 200 h to explore the effect of high-temperature environment on the emissivity of coated platinum film.After annealing,the average IR emissivity(at the wavelength of 3-14 μm) of the platinum film was only about 0.1 for polished sample and 0.45 for rough sample.The diffusion between platinum and the nickelalloy elements at 600℃ had been also discussed.