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Influence of oxidation on the dry sliding properties of HVOF-sprayed hardmetal coatings

 
: Berger, L.-M.; Saaro, S.; Woydt, M.

European Powder Metallurgy Association -EPMA-:
PM in Belgium, a crossroads in industry development. Vol.1: Hard materials : Euro PM 2006 Congress & Exhibition, 23 - 25 October 2006, Ghent, Belgium. Proceedings
Shrewsbury: EPMA, 2006
ISBN: 1-89907-232-2
ISBN: 978-1-89907-232-3
S.225-232
European Congress and Exhibition on Powder Metallurgy (EURO PM) <2006, Ghent>
Englisch
Konferenzbeitrag
Fraunhofer IWS ()
experimentelle Untersuchung; Gleitverschleiß; Voroxidation; Chromoxid; Aluminiumoxid; Sauerstoff-Hochgeschwindigkeitsspritzen; Hartbeschichten; Trockenreibung; Hammerschlag; Plasmaspritzen; Mikrohärte; Vickershärte; Röntgenbeugung; optische Mikroskopie; Rasterelektronenmikroskopie; Temperatureinfluß; WC=Wolframcarbid; Cobalt; Chrom; Nickel; Chromcarbid; Titancarbid; Molybdäncarbid; Titannitrid; Molybdännitrid; Reibkraft; Eisennickellegierung; Reibungskoeffizient; Gleitgeschwindigkeit

Abstract
In order to investigate the influence of the oxide scales on their tribological behavior the tribological properties of a variety of preoxidized hardmetal coatings (WC-CoCr, WC- (W,Cr)2C-Ni, Cr3C2-NiCr, (Ti,Mo) (C,N)-Ni, (Ti,Mo) (C,N)-Co) against sintered alumina were studied in an unlubricated dry sliding wear test. Tests were performed at room temperature, 600 deg C and 800 deg C with sliding speeds in the range 0.1-3 m/s with a wear distance of 5000 m and a normal force of 10 N. For comparison, preoxidized electrolytic hard chromium and APS-sprayed (atmospheric plasma spraying) Mo-NiCrBSi coatings were studied in the same conditions as well as APS-sprayed Cr2O3 coatings. The results of preoxidized coatings in this work are compared with those of non-oxidized coatings in previous experimental series. Preoxidation of hardmetal coatings did not lead to an improvement of the sliding wear resistance.

: http://publica.fraunhofer.de/dokumente/N-58596.html