DLC solid lubricant coatings on ball bearings for space applications

Vanhulsel, Annick; Velasco, Francisco; Jacobs, R. N.; Eersels, L.; Havermans, Danny; Roberts, E. W.; Sherrington, Ian; Anderson, Mike; Gaillard, L.

doi:10.1016/j.triboint.2006.12.005

Cited by 148 publications

(90 citation statements)

References 8 publications

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“…Wear coefficients using the volumes from profilometer have been compared with those obtained by the conventional method. The wear coefficients of TiN and DLC samples of all methods are consistent with the values reported in the literature 2 . Interesting results for the DLC wear coefficients were calculated by Vc-At and DI, which show significant difference between ks and kc, indicating that the wear of the coatings were lower than the substrate.…”

Section: Resultssupporting

confidence: 89%

“…One of the primary functions is to improve the wear resistance and thus increase the durability of components and products for engineering coatings such as TiN and DLC. Robust wear testing techniques are required to determine those aspects of the coatings performance 1 , and most of them are based on friction and wear [2][3][4][5] . Often, the test parameters involved depend of: the tribo system properties, the materials in contact, the surrounding and wear conditions 6 .…”

Section: Introductionmentioning

confidence: 99%

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Methods of data analysis for the ball cratering test on TiN and DLC coated steel

2016

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Titanium nitride (TiN) coatings are widely used in machining because of its mechanical characteristics which modify the surface of the substrate increasing the capacity of load support and reduction of friction, while a coating as diamond-like carbon (DLC), which also has interesting mechanical properties, needs better attention. In this sense, the development of new coatings such as DLC is as important as wear analysis techniques. This work discusses the methods available to assess abrasive wear of coatings. For this, it has been used the data of the crater volume formed in ball cratering test and compared the difference between the specific wear coefficients of substrate and coating (ks and kc). These coefficients depend of the methods used for data analyses, thus, it has been used four equations to calculate ks and kc. Moreover, profilometry (pf) has been used to calculate the volumes, and thus ks and kc. Also, the roughness of the coatings, the thickness, the images corresponding to the crater formed, the coefficient of friction, the data obtained in wear tests due to the volume removed and, in the end, a comparison between ks and kc by different methods of data analyzes are presented.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Methods of data analysis for the ball cratering test on TiN and DLC coated steel

2016

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“…They have a wide range of applications from machining to bio-implants as its hardness may approach half that of diamond (sp 3 Carbon-Carbon bonding) (1)(2)(3)(4)(5)(6). Previous investigators working with DLC have reported wear performance of the DLC coatings using pin-on-disc, ballcratering, reciprocating ball-on-plate and ring-on-disc apparatus (7)(8)(9)(10). Results have shown large variations in the wear properties owing to different deposition techniques, coating thickness above adhesion layer, type of metal substrate and experimental conditions (8,11).…”

Section: Introductionmentioning

confidence: 99%

Wear properties of diamond-like carbon coatings with silicon and chromium as adhesion layer using a high frequency reciprocating rig

Maiti

Mills

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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The application of Diamond-like-carbon coatings (DLC) to bearing surfaces is widespread from machining to bio-implants and has resulted in significant study of coating properties. The aim of this investigation was to determine the performance of two diamond-like-carbon coatings, using Chromium and Silicon as adhesion layers. Linear reciprocating wear tests were carried out at room temperature using an AISI 440C steel ball reciprocating against the DLC coated metal substrate. The performance of the coatings under different contact pressures (500 to 3000 MPa); peak sliding velocities (28 to 378 mm/s); and stroke length, (1.5 to 4 mm). An electric resistance measurement was used to monitor coating failure owing to the dielectric nature of the tested coatings.An increase in contact pressure resulted in a decrease in number of cycles to failure for both the coatings. However, the number of cycles to failure increased proportionally with sliding speed. In addition, artifacts on the coating and blister formation generated coating debris which acted as a third body during the wear process. The debris caused complete delamination of the coatings initially at the ends of the wear scar. The Silicon adhesion layer coating samples were found to provide a greater resistance to failure due to it being thicker, harder, and more elastic as compared to samples having a Chromium adhesion layer.

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“…With regard to reducing the friction coefficient at the tool/workpiece interface, the use of lubricants can enhance the ability to produce a good quality component [11]. To increase the effect of a lubricant treatment, a variety of surface engineering methods, such as diamond-like coatings (DLC) [12][13][14] and micro-scale texturing, have been applied to tool surfaces [15,16]. The DLCs act as solid lubricants and simultaneously increase wear resistance and reduce friction [12].…”

Section: Introductionmentioning

confidence: 99%

“…To increase the effect of a lubricant treatment, a variety of surface engineering methods, such as diamond-like coatings (DLC) [12][13][14] and micro-scale texturing, have been applied to tool surfaces [15,16]. The DLCs act as solid lubricants and simultaneously increase wear resistance and reduce friction [12]. Wank et al [17] investigated the capacity of DLC coatings in lubricant free cold massive forming of AA6016, the results showed that the capacity of DLCs depended strongly on tool surface roughness.…”

Section: Introductionmentioning

confidence: 99%

An experimental and numerical investigation of the effect of macro-textured tool surfaces in hot stamping

et al. 2015

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This paper presents a method of increasing drawability of materials in hot stamping processes using forming tools with macro-scale textures on the tool surfaces. Firstly, a series of tool texture designs and orientations were presented and a test programme was designed for the experimental investigation. Top-hat shape drawing experiments in cold and hot stamping conditions were conducted to evaluate the effect of macro-scale tool surface textures on the material drawing. Texture directional and texture feature effects of the blankholders on the draw-ability of the material have been investigated. A finite element model of the top-hat drawing process with textured tool surfaces has been established and validated from experimental data. Further FE process modelling has been carried out and the effects of texture features and forming speed have been studied. The relationships between texture designs and material drawing results have been analysed. The developed FE model can provide a guide to design the geometry of tool textures and optimise the hot stamping process parameters.

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DLC solid lubricant coatings on ball bearings for space applications

Cited by 148 publications

References 8 publications

Methods of data analysis for the ball cratering test on TiN and DLC coated steel

Methods of data analysis for the ball cratering test on TiN and DLC coated steel

Wear properties of diamond-like carbon coatings with silicon and chromium as adhesion layer using a high frequency reciprocating rig

An experimental and numerical investigation of the effect of macro-textured tool surfaces in hot stamping

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