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Volumetric and Size Characterization of Void Morphologies in Thermally Sprayed Metallic Deposits Using Scattering Techniques

Published

Author(s)

T Keller, W. Wagner, J Ilavsky, Andrew J. Allen, N Margadant, S Siegmann, J Pisacka, G Barbezat, R Enzl

Abstract

The complex void microstructure of thermally sprayed deposits may be approximated by three major void syste(interlamellar pores, intralamellar cracks, and volumetric globular voids), each with different volume fractions,anisotropies, sizes and shapes. This complex void morphology is expected to have a strong influence on theproperties of thermally sprayed coatings. NiCrAlY deposits manufactured by vacuum-, atmospheric- and water-stabilized plasma spraying and flame spraying techniques have previously been investigated by small angleneutron scattering (SANS) in the Porod scattering regime. A relationship between the void specific surface areaobtained and wear resistance was revealed. To characterize the void system in more detail, the technique ofmultiple small angle neutron scattering (MSANS), previously applied to thermally sprayed ceramic coatings, waapplied to the metallic NiCrAlY deposits. The above-mentioned three-component void morphology was assumedbased on empirical considerations and on analysis of SEM micrographs of coatings cross-sections. The modelliresults of the atmospheric- and water-stabilized- plasma sprayed metallic deposits suggest that, besides globularpores, interlamellar pores are most significant in the overall void systems.
Citation
International Thermal Spray Conference

Keywords

microstructure characterization, microstructure models, small-angle neutron scattering, thermal barrier coatings

Citation

Keller, T. , Wagner, W. , Ilavsky, J. , Allen, A. , Margadant, N. , Siegmann, S. , Pisacka, J. , Barbezat, G. and Enzl, R. (2021), Volumetric and Size Characterization of Void Morphologies in Thermally Sprayed Metallic Deposits Using Scattering Techniques, International Thermal Spray Conference (Accessed August 7, 2022)
Created October 12, 2021