Young’s Modulus and Residual Stresses of Oxide-Free Wire Arc Sprayed Copper Coatings

verfasst von

Manuel Rodriguez Diaz, Selina Raumel, Marc Christopher Wurz, Maik Szafarska, René Gustus, Kai Möhwald, Hans Jürgen Maier

Abstract

Conventional thermal spraying processes are almost exclusively carried out in an air atmosphere, resulting in the oxidation of the particle surfaces and interfaces within the coating and between the substrate and coating. Furthermore, the initial process of surface activation conventionally takes place in an air atmosphere, preventing an oxide-free interfacial transition. Consequently, the application of spraying materials with high oxygen affinity represents a major challenge. To overcome these issues, the present study utilized silane-doped inert gases to create an environment in which the oxygen concentration was equivalent to the residual oxygen content in an extreme high vacuum. By transferring the corundum blasting and coating process (wire arc spraying) to this environment, materials with a high oxygen affinity can be applied without oxidation occurring. For industrial use, this is an interesting prospect, e.g., for repair coatings, as the homogeneity of the composite is improved by a non-oxidized coating. Using the example of arc-sprayed copper coatings, the microstructure and mechanical properties of the coatings were analysed. The results showed that the oxide-free, wire arc sprayed copper coatings exhibited an improved wetting behaviour resulting in a significant reduction of the coating porosity. Moreover, the improved wetting behaviour and led to an increase in the bonding rate and apparent Young’s modulus. Contrary to expectations, the residual stresses decrease although relaxation mechanisms should be inhibited, and possible reasons for this are discussed in the paper.

Organisationseinheit(en)

Institut für Werkstoffkunde
Institut für Mikroproduktionstechnik

Externe Organisation(en)

Technische Universität Clausthal

Typ

Artikel

Journal

COATINGS

Band

12

ISSN

2079-6412

Publikationsdatum

06.10.2022

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Oberflächen und Grenzflächen, Oberflächen, Beschichtungen und Folien, Werkstoffchemie

Elektronische Version(en)

https://doi.org/10.3390/coatings12101482 (Zugang: Offen)