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Characterisation of Thermally Sprayed Metallic NiCrAlY Deposits by Multiple Small-Angle Scattering



T Keller, W. Wagner, Andrew J. Allen, J Ilavsky, S Siegmann, N Margadant, G Kostorz


The technique of multiple small-angle neutron scattering (MSANS), so far successfully applied to thermal-spray ceramics, has now been extended to thermal-spray metallic deposits. The samples under investigation are technologically relevant Ni-based NiCrA1Y coatings manufactured by different spraying techniques (atmospheric and water-stabilised plasma-spraying and flame-spraying). MSANS measurements were made in directions parallel and perpendicular to the surface plane. Based on empirical considerations and the analysis of SEM micrographs of coatings cross sections, the complex microstructures were modelled in terms of three distinct void systems. Employing the most recent MSANS formalism, the experimental beam broadening as a function of incident wavelength was used to derive the model parameters under the constraints of MSANS anisotropy, total measured porosity, and total surface area. The surface area was obtained from small-angle neutron scattering (SANS) analysis in the Porod regime. Relationships to macroscopic coating properties such as wear behaviour are discussed.
Applied Physics A-Materials Science & Processing
Part 2


coatings, microstructure characterization, neutron scattering, small-angle scattering


Keller, T. , Wagner, W. , Allen, A. , Ilavsky, J. , Siegmann, S. , Margadant, N. and Kostorz, G. (2002), Characterisation of Thermally Sprayed Metallic NiCrAlY Deposits by Multiple Small-Angle Scattering, Applied Physics A-Materials Science & Processing, [online], (Accessed July 24, 2024)


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Created November 30, 2002, Updated October 12, 2021