Surface structuring of case hardened chain pins by cold-sprayed microparticles to modify friction and wear properties--颗粒学报PARTICUOLOGY

Buhl, S., Schmidt, K., Sappok, D., Merz, R., Godard, C., Kerscher, E., . . . Ripperger, S. (2015). Surface structuring of case hardened chain pins by cold-sprayed microparticles to modify friction and wear properties. Particuology, 21, 32-40. https://doi.org/10.1016/j.partic.2014.10.001

Surface structuring of case hardened chain pins by cold-sprayed microparticles to modify friction and wear properties

S. Buhl ^a *, K. Schmidt ^a, D. Sappok ^b, R. Merz ^d, C. Godard^c, E. Kerscher ^c, M. Kopnarski ^d, B. Sauer ^b, S. Antonyuk ^a, S. Ripperger ^a

a Particle and Process Engineering, University of Kaiserslautern, Gottlieb-Daimler-Straße 47, Kaiserslautern, Germany
b Institute of Machine Elements, Gears, and Transmissions, University of Kaiserslautern, Gottlieb-Daimler-Straße 42, Kaiserslautern, Germany
c Materials Testing, Gottlieb-Daimler-Straße 47, Kaiserslautern, Germany
d IFOS Institute, Trippstadter Straße 120, Kaiserslautern, Germany

10.1016/j.partic.2014.10.001

Volume 21, August 2015, Pages 32-40

Received 8 July 2014, Revised 19 September 2014, Accepted 7 October 2014, Available online 29 November 2014, Version of Record 6 June 2015.

E-mail: sebastian.buhl@mv.uni-kl.de

Highlights

• Microscale titania particles were bonded to case hardened steel pins using cold spraying.

• CFD simulation was used to get a better understanding of the process.

• Hardness of the structured chain pins was not decreased during cold spraying.

• Friction coefficient of the structured chain pins decreased significantly.

• Surface structure and chemistry of the particle structured pins were characterized.

Abstract

This paper presents the results of the application of a cold spray technique for structuring metallic surfaces with microparticles. The resulting changes in surface properties were characterized to observe their influences on the tribological behavior of the structured surface. The spray technique was applied to a technical component, a 16MnCr5 steel chain pin, designed to be mounted in a linear reciprocating tribometer. TiO₂ microparticles were used to structure the surface with a homogeneous distribution of singly dispersed particles, rather than a homogeneous closed coating on the surface. Tribometer tests were performed to directly compare structured and unstructured chain pins, and a significantly reduced sliding friction coefficient was observed for the structured pin. The pins were characterized in detail by surface analysis prior to and after application of the tribological load to set the surface parameters and surface chemistry, even on the microscale. It was confirmed that the particle structuring induced changes in the surface properties, and the durability of the changes after tribological loading was evaluated.

Graphical abstract

Keywords

Cold spraying; Surface structuring; TiO₂ microparticles; Driving chain; Sliding friction

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