Wetting and interactions of Ni- and Co-based superalloys with different ceramic materials

• Published in: Journal of materials science 2010-04, Vol.45 (8), p.2071-2079
• Main Authors: Valenza, F., Muolo, M. L., Passerone, A.
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Ceramic materials; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Cobalt; Cobalt base alloys; Crystallography and Scattering Methods; Heat resistant alloys; Htc2009; Materials Science; Mullite; Nickel; Nickel base alloys; Organic chemistry; Polymer Sciences; Process parameters; Sapphire; Sessile drop method; Solid Mechanics; Substrates; Superalloys; Turbine blades; Turbines; Wettability; Wetting; Zirconium dioxide; Zirconium oxide
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-009-3801-4

In this work, a systematic study of the wetting behavior of two Ni-based and one Co-based superalloys, used, in particular, for the fabrication of turbine blades, is presented with reference to different ceramic substrates: sapphire, polycrystalline alumina, zirconia, and mullite. Wettability tests have been performed by means of the “sessile drop” method at 1500 °C; the characterization of the interfaces between the molten drop and the substrates has been performed by SEM/EDS analysis in order to check the final characteristics of the solidified interfaces. The results are discussed in terms of chemical interactions in relation to the processing parameters and as a function of the surface and interfacial, morphological and energetic properties of the systems.