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Abstract

Plasma sprayed thermal barrier coatings (TBC) have been successfully applied onto gas turbine components. To enable their full potential to be achieved there is a need to reduce crack propagation and delamination. The aim of this investigation was to evaluate the open porosity of the films and the possibility to seal or reduce this open porosity. The thermal barriers (Ni(Co)CrAlY alloy / yttria stabilized zirconia) are elaborated by plasma spray (PS) and the sealing by superficial SiO(2) layers using chemical vapour deposition (CVD). The unmodified and coated TBC samples have been characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and mercury porosity measurement. To determine whether the previously discussed CVD coating was able to reduce the oxidation of the bond coating layer of thermal barrier coating, TBC samples were subjected to a high temperature oxidation test (1000 C; 1000 h).

Additional information

Authors: LABATUT C, JRC Ispra (IT);BROSSA F, JRC Ispra (IT);CRIPPA A, JRC Ispra (IT);BIANCHI P, ENEL-CRAM, Milano (IT)
Bibliographic Reference: Paper presented: 11th International Conference on Surface Modification Technologies, Paris (FR), September 8-10, 1997
Availability: Available from (1) as Paper EN 40704 ORA
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