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Investigation of HVOF-sprayed hardmetal coatings for static friction applications

: Berger, Lutz-Michael; Spatzier, Jörg; Gräfensteiner, M.; Vidner, J.; Leidich, Erhard; Schiefer, S.; Gröger, Sophie; Gerlach, Marco

Lima, R.S. ; ASM International:
International Thermal Spray Conference & Exposition, ITSC 2013 : Innovative Coating Solutions for the Global Economy; Busan, Republic of Korea, 13 – 15 May 2013
Red Hook, NY: Curran, 2013
ISBN: 978-1-63266-681-9
International Thermal Spray Conference & Exposition (ITSC) <2013, Busan>
Conference Paper
Fraunhofer IWS ()
sprayed coatings; tribology; contact pressures; hardmetal coatings

Frictionally engaged joints are widely used in mechanical engineering and require a high static friction. Thermally sprayed hardmetal coatings have a high potential to fulfil this requirement. However, almost all research activities are traditionally focused on the decrease of the dynamic coefficient of friction. In this paper the static coefficient of friction of as-sprayed Cr 3C2-NiCr coatings in torsion experiments with different contact pressures was studied. The form, orientation and the geometric characteristics of the friction surface have been investigated. The slipping curves have been determined and a static coefficient of friction μmax up to 0.80 was measured. The results show a standard deviation depending on the nominal contact pressure.