Anisotropic electrical properties in thermal spray metallic coatings

Atin Sharma; Richard J. Gambino; Sanjay Sampath

doi:10.1016/j.actamat.2005.08.029

Anisotropic electrical properties in thermal spray metallic coatings

Atin Sharma
, Richard J. Gambino
, Sanjay Sampath

Materials Science and Engineering

Stony Brook University

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Direct current resistivity of freestanding metallic coatings of Ni-Al alloys made by a variety of thermal spray processes was measured in-plane (=ρ_ip) and through-thickness (=ρ_tt), using a four-contact method. The coatings exhibited anisotropic resistivities with anisotropy (=ρ_tt/ρ_ip) ranging from 1.1 to 2.2 across the processes. Results are analyzed in the context of coating microstructures and chemical compositions obtained by electron microscopy. In addition, a simple electric circuit analysis approximating the coating as brick-layer structure illustrates the significance of splat interfaces to electrical behavior.

Original language	English
Pages (from-to)	59-65
Number of pages	7
Journal	Acta Materialia
Volume	54
Issue number	1
DOIs	https://doi.org/10.1016/j.actamat.2005.08.029
State	Published - Jan 2006

Keywords

Anisotropy
Electrical resistivity
Microstructure
Nickel alloys

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10.1016/j.actamat.2005.08.029

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abstract = "Direct current resistivity of freestanding metallic coatings of Ni-Al alloys made by a variety of thermal spray processes was measured in-plane (=ρip) and through-thickness (=ρtt), using a four-contact method. The coatings exhibited anisotropic resistivities with anisotropy (=ρtt/ρip) ranging from 1.1 to 2.2 across the processes. Results are analyzed in the context of coating microstructures and chemical compositions obtained by electron microscopy. In addition, a simple electric circuit analysis approximating the coating as brick-layer structure illustrates the significance of splat interfaces to electrical behavior.",

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AU - Gambino, Richard J.

AU - Sampath, Sanjay

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AB - Direct current resistivity of freestanding metallic coatings of Ni-Al alloys made by a variety of thermal spray processes was measured in-plane (=ρip) and through-thickness (=ρtt), using a four-contact method. The coatings exhibited anisotropic resistivities with anisotropy (=ρtt/ρip) ranging from 1.1 to 2.2 across the processes. Results are analyzed in the context of coating microstructures and chemical compositions obtained by electron microscopy. In addition, a simple electric circuit analysis approximating the coating as brick-layer structure illustrates the significance of splat interfaces to electrical behavior.

KW - Anisotropy

KW - Electrical resistivity

KW - Microstructure

KW - Nickel alloys

UR - https://www.scopus.com/pages/publications/27744496499

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JO - Acta Materialia

JF - Acta Materialia

IS - 1

ER -

Anisotropic electrical properties in thermal spray metallic coatings

Abstract

Keywords

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