Thermal conductivity of ZrO2-4 mol%Y2O3 thin coatings by pulsed thermal imaging method

Abstract

Thin ZrO 2-4mol% Y 2 O 3 coatings were deposited onto ZrO 2 substrates by electron beam-physical vapor deposition. The coated samples revealed a feather-like columnar microstructure. The main phase of the ZrO 2-4mol% Y 2 O 3 coatings was the tetragonal phase. To evaluate the influence of the coating's thickness on the thermal conductivity of thin ZrO 2-4mol% Y 2 O 3 coatings, the pulsed thermal imaging method was employed to obtain the thermal conductivity of the coating layer in the two-layer (coating and substrate) samples with thickness between 56 and 337 micrometers. The thermal conductivity of the coating layer was successfully evaluated and compared well with those obtained by the laser flash method for similar coatings. The thermal conductivity of coatings shows an increasing tendency with an increase in the coating's thickness.

In Situ Preparation and Corrosion Resistance of a ZrO2 Film on a ZrB2 Ceramic

“…The preparation methods for ZrO 2 coatings, such as the hydrothermal treatment [6], sol-gel method [7], physical vapor deposition [8], electrodeposition [9] and spraying techniques [10] are highly developed. Among the existing methods, the in situ reaction technique is characterized by its uniform coating and the perfect bonding with the substrate.…”