Tribological Properties of Diamond-Like Carbon Coatings

2014 ◽  
Vol 874 ◽  
pp. 9-15 ◽  
Author(s):  
Monika Madej
Keyword(s):  
Tribological Properties ◽  
Cross Sections ◽  
Chemical Vapor ◽  
Substrate Material ◽  
Diamond Like Carbon ◽  
Linear Wear ◽  
Tribological Behaviour ◽  
Carbon Coatings ◽  
Coated Metal ◽  
Composition And Structure

The aim of the study was to analyze the superhard anti-wear diamond-like carbon coatings produced by Plasma Assisted Chemical Vapor Deposition (PACVD) and Physical Vapour Deposition (PVD). The a-C:H and a-C:H:W coatings were deposited on steel elements operating under friction conditions. The analysis involved comparing the tribological properties of coated metal elements with those of uncoated elements. It was essential to analyze how the coating composition and structure influence the tribological behaviour of elements under dry and lubrication friction conditions. The coating structure was analyzed by observing the topography of the surface and the cross-sections using an atomic force microscope (AFM) and a scanning electron microscope (SEM). The results were employed to determine the elemental composition and thickness of the coatings. The tribological tests were performed applying a ball-on-disc tribometer and using a pin-on-plate tribometer. The tribological properties were analyzed also in a micro scale using a microtribometer. Compared with the substrate material - steel, the diamond-like carbon coatings showed lower linear wear, lower friction coefficient and higher hardness.

The Effect of CNT Content on the Tribological Properties of CNTs Doped Diamond-Like Carbon Films

2015 ◽  
Vol 642 ◽  
pp. 231-235
Author(s):  
Che Hung Wei ◽  
Jui Feng Yang ◽  
Chao I Wang
Keyword(s):  
Friction Coefficient ◽  
Critical Load ◽  
Internal Stress ◽  
Tribological Properties ◽  
Chemical Vapor ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Element Analysis ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Diamond-like carbon (DLC) films is useful in many applications. To improve the tribological properties in DLC, we spin coat the multi-walled carbon nanotubes (CNTs) with different solution on (100) silicon. DLC was deposited by plasma enhanced chemical vapor deposition (PECVD) with C2H2and H2. The results show that the ID/IGratio is increasing with higher CNTs content while the friction coefficient and critical load are decreasing with larger CNTs contents. The decreasing friction coefficient results from graphitation on the surface due to higher sp2content. The decreasing critical load is attributed to higher internal stress. The effect of friction coefficient and CNT concentration on stress distribution is studied by a nanoscratch finite element analysis. The results indicate that low friction coefficient and high CNT concentration will reduce the stress magnitude in the film. Therefore, the decreasing friction coefficient in CNT doped DLC film with increasing CNT concentration should reduce stress in the film and is good for adhesion. The discrepancy between friction coefficient and critical load is explained in terms of high internal stress during deposition. A surface treatment on CNT before deposition to reduce internal stress is currently under investigation.

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

2017 ◽  
Vol 231 (12) ◽  
pp. 1605-1615 ◽  
Author(s):  
Raman Maiti ◽  
Robin Mills
Keyword(s):  
Diamond Like Carbon ◽  
Wear Properties ◽  
Adhesion Layer ◽  
Stroke Length ◽  
Carbon Coatings ◽  
Wear Process ◽  
Coated Metal ◽  
Carbon Coated ◽  
Number Of Cycles ◽  
Cycles To Failure

The application of diamond-like carbon coatings 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 diamond-like carbon-coated metal substrate. The performance of the coatings under different contact pressures (500–3000 MPa); peak sliding velocities (28–378 mm/s); and stroke length, (1.5–4 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.

Tribological properties of diamond-like carbon coatings prepared by anode layer source and magnetron sputtering

2011 ◽  
Vol 205 ◽  
pp. S99-S102 ◽  
Author(s):  
S. Paskvale ◽  
M. Kahn ◽  
M. Čekada ◽  
P. Panjan ◽  
W. Waldhauser ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Tribological Properties ◽  
Diamond Like Carbon ◽  
Anode Layer ◽  
Carbon Coatings

Mechanical and unlubricated tribological properties of titanium-containing diamond-like carbon coatings

Wear ◽  
2009 ◽  
Vol 266 (1-2) ◽  
pp. 96-102 ◽  
Author(s):  
Jia-Hu Ouyang ◽  
Shinya Sasaki ◽  
Takashi Murakami ◽  
Yu Zhou ◽  
Jian Zhang
Keyword(s):  
Tribological Properties ◽  
Diamond Like Carbon ◽  
Carbon Coatings

Influence of Silicon, Oxygen and Nitrogen Admixtures Upon the Properties of Plasma Deposited Amorphous Diamond-Like Carbon Coatings

2006 ◽  
Vol 9 (2) ◽  
Author(s):  
Vilma Buršíková ◽  
Lenka Zajíčková ◽  
Pavel Dvořák ◽  
Miroslav Valtr ◽  
Jiří Buršík ◽  
...  
Keyword(s):  
Mechanical Stability ◽  
Chemical Vapor ◽  
Optical Emission ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Depth Sensing ◽  
Capacitively Coupled ◽  
Reactive Plasma ◽  
Composition And Structure ◽  
Silicon Oxygen

AbstractAmorphous diamond-like carbon films (DLC) with various silicon, oxygen and nitrogen content were deposited by plasma enhanced chemical vapor deposition (PECVD) technique. The films were prepared from the mixture of methane and hexamethyldisiloxane (HMDSO) in r.f. capacitively coupled discharges (13.56 MHz). The reactive plasma was investigated by optical emission spectroscopy and capacitive coupled planar probe. A combination of RBS, ERDA, FTIR and XPS methods was used to study the films’ chemical composition and structure. The mechanical properties were studied using a depth sensing indentation technique. The films were mainly composed of C-C, C-H and C-Si bonds. The optimum deposition conditions for the preparation of DLC films, with enhanced thermo-mechanical stability, were determined.

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