M. Woydt - Academia.edu (original) (raw)
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Papers by M. Woydt
Wear, 2015
This paper shows how Angle-Resolved Scattering can reveal wear on engineered surfaces. The sample... more This paper shows how Angle-Resolved Scattering can reveal wear on engineered surfaces. The samples studied, three discs made of steel 100Cr6H used in gear wheels in the automotive industry, were assessed after they had undergone ball-on-disc tests. Scattering maps recorded for spatial frequencies from 0.1 mm À 1 to 2.7 mm À 1 show a contrast inversion around 0.36 mm À 1 revealing the wear trace. Besides measurements of rms roughness, where mean values are 20 nm and 24 nm depending on the locations considered, stationarity and isotropy, we demonstrate the ability of the technique to reveal localized wear on this type of surface in a rapid, robust and convenient way. We show that the tool trace is influenced by the load magnitude rather than by the number of oscillation cycles and highlight the key role played by surface roughness in how the sample responds to wear tests.
Surface Science, 2011
A correlation of adhesion force and electrical conductivity is established for a vanadium oxide a... more A correlation of adhesion force and electrical conductivity is established for a vanadium oxide and highly oriented pyrolytic graphite (HOPG). Adhesion forces were determined by analysis of pull-off forces obtained from force–distance curves with atomic force microscopy in ultrahigh vacuum, on clean surfaces and with defined contact conditions. The investigated samples include (i) different stoichiometries of Magnéli-type vanadium oxides (V3O5,
Journal of Raman Spectroscopy, 2001
ABSTRACT
Industrial Lubrication and Tribology, 2007
Purpose – This paper aims to focus on the potential for substituting molybdenum-based piston ring... more Purpose – This paper aims to focus on the potential for substituting molybdenum-based piston ring coatings, which are recognized as “allrounder” by other candidate metallurgies. Another purpose is the tribological interaction of molybdenum-based and new triboactive/reactive piston ring coatings with low SAP, polymer- and metal-free as well as bionotox engine oils with high-viscosity indices. Design/methodology/approach – Substoichiometric titanium dioxide composed
Ewsuk/Characterization, 2010
Wear, 2015
This paper shows how Angle-Resolved Scattering can reveal wear on engineered surfaces. The sample... more This paper shows how Angle-Resolved Scattering can reveal wear on engineered surfaces. The samples studied, three discs made of steel 100Cr6H used in gear wheels in the automotive industry, were assessed after they had undergone ball-on-disc tests. Scattering maps recorded for spatial frequencies from 0.1 mm À 1 to 2.7 mm À 1 show a contrast inversion around 0.36 mm À 1 revealing the wear trace. Besides measurements of rms roughness, where mean values are 20 nm and 24 nm depending on the locations considered, stationarity and isotropy, we demonstrate the ability of the technique to reveal localized wear on this type of surface in a rapid, robust and convenient way. We show that the tool trace is influenced by the load magnitude rather than by the number of oscillation cycles and highlight the key role played by surface roughness in how the sample responds to wear tests.
Surface Science, 2011
A correlation of adhesion force and electrical conductivity is established for a vanadium oxide a... more A correlation of adhesion force and electrical conductivity is established for a vanadium oxide and highly oriented pyrolytic graphite (HOPG). Adhesion forces were determined by analysis of pull-off forces obtained from force–distance curves with atomic force microscopy in ultrahigh vacuum, on clean surfaces and with defined contact conditions. The investigated samples include (i) different stoichiometries of Magnéli-type vanadium oxides (V3O5,
Journal of Raman Spectroscopy, 2001
ABSTRACT
Industrial Lubrication and Tribology, 2007
Purpose – This paper aims to focus on the potential for substituting molybdenum-based piston ring... more Purpose – This paper aims to focus on the potential for substituting molybdenum-based piston ring coatings, which are recognized as “allrounder” by other candidate metallurgies. Another purpose is the tribological interaction of molybdenum-based and new triboactive/reactive piston ring coatings with low SAP, polymer- and metal-free as well as bionotox engine oils with high-viscosity indices. Design/methodology/approach – Substoichiometric titanium dioxide composed
Ewsuk/Characterization, 2010