1243 Effects of Inter-splat pore on the Mechanical Property of APSed Thermal Barrier Coatings Evaluated by Indentation Method

Abstract

Indentation test was carried out to measure mechanical properties (especially elastic modulus) of 8 wt.% Y_2O_3 partially stabilized ZrO_2 (YSZ) top coat used for Thermal barrier coatings (TBCs). The top coat was fabricated by air plasma spraying (APS) method. The APS coatings have very characteristic microstructure that consists of ceramic splats and inter-splat pores. Focusing on the intrinsic splat-structure on the mechanical behavior of APSed YSZ TBCs, quasi-splat structure specimens were also specified for the comparison. Special discussions were made on the effect of inter-splat pore on the elastic modulus evaluated by the indentation method.