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Abstract
The mechanical behaviour of free standing air plasma sprayed (APS) partially yttria stabilised zirconia (P-YSZ) thermal barrier coatings (TBC) at room temperature and at elevated temperatures up to 1050°C have been investigated. Creep tests under constant compressive load have been conducted as well as cyclic measurements of compressive stress – strain hysteresis loops with increasing maximum load, yielding Young's moduli of the porous partially yttria stabilised zirconia. Both mechanical parameters are needed for accurate modelling of the local stress fields of, for example, airfoils to identify critical regions where damage or even failure of the component may occur. Specimens in the as sprayed and sintered state were tested. The microstructural changes caused by sintering and mechanical loading at high temperature of the thermal barrier coatings have been characterised by porosity measurements made from metallographic cross-sections.