Authors: Echsler, H.; Renusch, D.; Schütze, M.

Source: Materials Science and Technology, Volume 20, Number 7, July 2004 , pp. 869-876(8)

Publisher: Maney Publishing

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.

Keywords: PARTIALLY STABILISED ZIRCONIA; CREEP; SINTERING; AIR PLASMA SPRAYED THERMAL BARRIER COATINGS; YOUNG'S MODULUS; THERMAL BARRIER COATINGS

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708304225017346

Affiliations: Karl-Winnacker-Institut der DECHEMA eV, Theodor-Heuss-Allee 25, D – 60486 Frankfurt am Main, Germany

Publication date: 2004-07-01

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