Thermal expansion coefficient of a NiCoCrAlY-ZrO₂(Y₂O₃) coating by a digital image processing based dilatometer
by M. Beghini, L. Bertini, F. Frendo
International Journal of Materials and Product Technology (IJMPT), Vol. 15, No. 1/2, 2000

Abstract: A procedure for thermal expansion coefficient measurement is presented. A quartz dilatometer and a digital image processing technique were employed to obtain an accurate measure of the elongation of a prismatic specimen placed in a tubular furnace. By testing several symmetrically coated specimens the thermal expansion coefficient of a NiCoCrAlY-ZrO₂(Y₂O₃) coating was obtained. The relationships for deducing the coefficient of the coating were derived by the multi-layer beam model and their sensitivity to experimental errors was discussed. Results were obtained in the range 20°C-950°C, both for the substrate and coating materials. An estimate of results accuracy is given, based on a Monte Carlo simulation of uncertainties.

Online publication date: Tue, 01-Jul-2003

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