Characterization of tribo-layers on self-lubricating plasma-assisted chemical-vapor-deposited TiN coatings

Badisch, E.; Mitterer, Christian; Mayrhofer, P.H.; Mori, Gregor; Bakker, Ronald J.; Brenner, Josef; Störi, H.

doi:10.1016/j.tsf.2004.01.091

Cited by 43 publications

(24 citation statements)

References 21 publications

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“…The low scatter of the friction coefficient is considered to be due to the alumina ball counterpart, as it has been reported that this material shows only insignificant material transfer to the tribological contact during dry sliding tests against hard coatings such as TiN or VN [23]. Hence, ball transfer material can not influence the sliding contact [24].…”

Section: Resultsmentioning

confidence: 99%

“…Tribometer testing against austenitic stainless steel balls (see figure 1(b)) significantly changes the frictional contact since the relatively low hardness of these balls compared to alumina allows considerable ball material transfer to the wear track [23]. Room temperature tests resulted in a highly scattered friction curve with a friction coefficient of approx.…”

Section: Resultsmentioning

confidence: 99%

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A New Low Friction Concept for High Temperatures: Lubricious Oxide Formation on Sputtered VN Coatings

et al. 2004

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The binary system of vanadium and nitrogen offers promising phases in order to enhance the tribological properties of common hard coatings, owing to their ability to form lubricious oxides, often also referred to as Magne´li phases, at elevated temperatures. The aim of this work is to characterize VN coatings prepared by reactive unbalanced magnetron sputtering, and to verify the new concept of solid/liquid oxide lubrication. Oxidation of the coatings and possible melting of the oxides were investigated by dynamic Thermo-Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) up to 900°C in air. On heating the coating samples, exothermal reactions appeared during the DSC measurements indicating oxidation in the temperature range of 500-650°C. Subsequently, endothermal melting reactions were observed between 650 and 850°C. To investigate the effect of oxide formation and melting, dry sliding experiments against alumina and austenitic stainless steel balls were performed using a ball-on-disc tribometer in the temperature range between 25°C and 700°C. For all coatings evaluated, a significant decrease of the friction coefficient at temperatures above 500°C was observed compared to room temperature. Additionally, oxide phases were identified by X-ray Diffraction (XRD) after DSC and tribometer testing. Finally, it can be concluded that the lubricious oxide concept should strongly contribute to the reduction of friction for future machining applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A New Low Friction Concept for High Temperatures: Lubricious Oxide Formation on Sputtered VN Coatings

et al. 2004

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“…Chlorine diffuses out of the films if annealed at temperatures above 700 C. Corresponding results have been obtained by mass-spectroscopy measurements during annealing of chlorine containing TiN films. [113] At T a = 1100 C the Cl content of the films is essentially zero.…”

Section: Decomposition Of Supersaturated Ti(nb)mentioning

confidence: 98%

Self‐Organized Nanostructures in Hard Ceramic Coatings

2005

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Nanostructures have attracted increasing interest in modern development of hard coatings for wear‐resistant applications. In plasma‐assisted vapor deposited thin films, nanostructures can evolve during growth or a post‐deposition annealing treatment. In this review we demonstrate, using TiB2.4, TiN–TiB2, Ti0.34Al0.66N, and Ti(N,B) as model‐coatings, the development of nanostructures and its influence on the mechanical properties of ceramic thin films. For TiB2.4 and TiN–TiB2 a two‐dimensional and three‐dimensional nanostructure, respectively, organizes itself during growth by segregation driven processes. Growth of Ti0.34Al0.66N and Ti(N,B) results in the formation of a supersaturated TiN based phase, which tends to decompose into its stable constituents during post‐deposition annealing via the formation of nm‐sized domains. As the hardness of a material is determined by resistance to bond distortion and dislocation formation and motion, which depend on the amount and constitution of obstacles provided, there is a direct relation between hardness and nanostructure.

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“…Optical profilometry [14,17] and microscopy [14] are often chosen to investigate wear and topographical changes in samples.…”

Section: Introductionmentioning

confidence: 99%

Effects of phosphorus on friction behaviour in wet clutch systems: A comparison of various coatings

Stadler

Brenner

Schindel

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents the investigation of effects of phosphorus-containing coatings on the friction behaviour. Three types of technologically fabricated coatings are investigated: zinc phosphate, iron phosphate, and a third the composition of which is still confidential as it is being patented. For the description of the composition and the properties of these coatings, scanning electron microscopy, energy dispersive X-ray analysis, and electron backscattered diffraction are used among other methods. Friction behaviour is characterized by a disc-on-disc tribometer, in which coated steel discs rotate against so-called paper friction discs under lubricated conditions. Tests are carried out with two different types of lubricants and at two temperatures. The disc-ondisc tests show the influence of coatings on the level and stability of the coefficient of friction (the occurrence of stick-slip or vibrations). Results show that phosphorus-containing coatings reduce or -in certain cases -even prevent the occurrence of stick-slip. Therefore, one focus of the discussion is the investigation of layers formed during tribological tests. For detailed chemical information of the surface, selected systems are also characterized by X-ray photoelectron spectroscopy. Differences in the chemical state of otherwise equal zinc phosphate coatings can explain differences in the experimental results.

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Characterization of tribo-layers on self-lubricating plasma-assisted chemical-vapor-deposited TiN coatings

Cited by 43 publications

References 21 publications

A New Low Friction Concept for High Temperatures: Lubricious Oxide Formation on Sputtered VN Coatings

A New Low Friction Concept for High Temperatures: Lubricious Oxide Formation on Sputtered VN Coatings

Self‐Organized Nanostructures in Hard Ceramic Coatings

Effects of phosphorus on friction behaviour in wet clutch systems: A comparison of various coatings

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