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

Published

December 1, 2002

Author(s)

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

Abstract

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.

Citation

Applied Physics A-Materials Science & Processing

Volume

74

Issue

Part 2

Pub Type

Journals

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Keywords

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

Citation

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], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=850535 (Accessed December 12, 2024)