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Abstract
Infrared radiative properties of thermal barrier coatings have been investigated for developments of solar absorbing surface coatings. Various types of multilayer broadband optical filters were designed incorporating 7 wt-% yttria stabilised zirconia (7YSZ) and aluminium oxide (Al2O3). Electron beam physical vapour deposition method was employed to deposit 7YSZ thin films on quartz substrates to study their optical properties. The refractive index and thickness of 7YSZ films were estimated using spectroscopic ellipsometry technique, giving the index as 1·95 at 633 nm. Multilayer thermal barrier coating structures were fabricated by depositing alternate layers of 7YSZ and Al2O3 on quartz using electron beam physical vapour deposition. The spectral characteristics of multilayer 7YSZ–Al2O3 coatings were evaluated using a spectrometer in the visible and near infrared range. Preliminary results obtained from multilayer 7YSZ–Al2O3 coatings had exhibited 75% transmission over a wide band of 0·4–1·0 μm.
The authors wish to acknowledge the Engineering and Physical Sciences Research Council (EPSRC), UK, and Ultra Precision and Structured Surfaces, Integrated Knowledge Centre (UPSCitation2-IKC) for financial support through award no. EP/EO23711/1. Mr M. Targa would like to acknowledge ‘Associazione Amici Museo del Patrimonio Industriale, Italy’ within the framework of the Leonardo Da Vinci project for providing support and assistance to carry out his research field training at Cranfield University.