New composite metal-ceramic coatings were developed and tested as possible high-temperature resistance abradable materials for the first stage of industrial gas turbines. APS deposition process was used to obtain high-temperature resistant composite CoNiCrAIY/AI2O3coatings. Composite CoNiCrAIY/Graphite coatings were produced by laser cladding. The HTO behavior of thecomposite coatings was studied. CoNiCrAlY/Al203 and CoNiCrAIY/graphite coatings after 1000 h at 1100C do not show relevant microstructural modifications. The oxidation resistance of the new composite coatings sat-isfied OEM specifications. The newly developed thick and porous TBC systems passed the thermal fatigue test according to the considered OEM procedures, regardless of the top coat porosity.Hardness Rockwell 15Y mea-surements suggest that all the produced coatings must be used with abrasive-tipped blades. MCrAIY/graphite and MCrAIY/alumina shrouds were generally too resistant to cutting or resulted in an extensive material transfer to the c-BN-tipped blades.Thick and porous TBC coat-ings with top coats having medium and high porosity levels have shown good abradability behavior against c-BN-tipped blades.
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