scholarly journals Influence of WS2Nanopowder Addition on Friction Characteristics of ta-C Coating by FCVA Method

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Si-Geun Choi ◽  
Yong-Joong Lee ◽  
Young-Jun Jang ◽  
Dawit Zenebe Segu ◽  
Seock-Sam Kim ◽  
...  
Keyword(s):  
Raman Spectrum ◽  
Friction Coefficient ◽  
Tribological Behavior ◽  
Vacuum Arc ◽  
Particle Sizes ◽  
Friction Test ◽  
Alpha Olefin ◽  
Filtered Cathodic Vacuum Arc ◽  
Nano Size ◽  
Lubrication Conditions

The influence of nano-sizeWS2powders on the tribological behavior of ta-C coatings by the filtered cathodic vacuum arc (FCVA) method under boundary lubrication conditions has been investigated. In order to characterize and understand tribological behaviors of nano-sizeWS2powders added to the synthetic oil (poly-alpha-olefin 6), lubricants with different mixture ratios, ranging from 2 to 8 wt%, have been prepared. ta-C coatings fabricated by FCVA method showed that the G-peak in the obtained Raman spectrum was shifted from 1520 to 1586 cm−1, indicating the sp3content increased for samples with the thickness of 156 nm. The average friction coefficient decreased proportionally as the nano-sizeWS2compositions increased up to 4 wt% in PAO6. After the friction test, structures and particle sizes ofWS2phases were also precisely characterized by using XRD and SEM.

scholarly journals Friction and Wear Mechanisms of Cu/ta-C Coatings Under PAO-4 and PAO-4 with MoDTC Lubrication

2020 ◽  
Vol 01 (04) ◽  
pp. 183-187
Author(s):  
Decelyne Elly Binjua ◽  
Seock-Sam Kim ◽  
Young-Jun Jang ◽  
Jong-Kuk Kim
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Friction And Wear ◽  
Vacuum Arc ◽  
Dlc Coatings ◽  
Base Oil ◽  
Tetrahedral Amorphous Carbon ◽  
Friction And Wear Mechanisms ◽  
Alpha Olefin ◽  
Filtered Cathodic Vacuum Arc

The tribological behavior of various types of DLC coatings in formulated and non-formulated lubricants are needed for proper usage of these coatings. In this research, the friction and wear mechanism of four different DLC coatings in poly-alpha-olefin type 4 (PAO-4) with and without MoDTC were investigated using ball-on-disc tribometer. One ta-C (tetrahedral amorphous carbon) and three Cu/ta-C (copper doped ta-C) with different sputter power of 50 W, 150 W, and 200 W coatings were deposited on silicon wafers by using FCVA (filtered cathodic vacuum arc) technique for this research. The results indicate that ta-C coating on silicon wafer has the lowest average friction coefficient (CoF) and better wear resistance than Cu/ta-C coating when lubricated under PAO-4 oil with MoDTC. Cu/ta-C with sputter powers of 150 W and 200 W exhibited the highest average friction coefficient under PAO-4 oil with MoDTC. Meanwhile, the average CoF for all samples were similar under PAO-4 base oil. In terms of wear, ta-C coating showed the highest wear rate under PAO-4 base oil then followed by Cu/ta-C with sputter power of 50 W. Nonetheless, Cu/ta-C with sputter powers of 150 W and 200 W exhibited significantly low wear rate under PAO-4 base oil compared to PAO-4 oil with MoDTC.

Tribological behavior of diamond-like carbon coatings with patterned structure deposited by the filtered cathodic vacuum arc

2019 ◽  
Vol 685 ◽  
pp. 123-130 ◽  
Author(s):  
Yongqing Shen ◽  
Han Zhou ◽  
Haoqi Wang ◽  
Bin Liao ◽  
Xianying Wu ◽  
...  
Keyword(s):  
Tribological Behavior ◽  
Vacuum Arc ◽  
Diamond Like Carbon ◽  
Carbon Coatings ◽  
Filtered Cathodic Vacuum Arc

scholarly journals Regression Analysis of the Effect of Bias Voltage on Nano- and Macrotribological Properties of Diamond-Like Carbon Films Deposited by a Filtered Cathodic Vacuum Arc Ion-Plating Method

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Shojiro Miyake ◽  
Takanori Shindo ◽  
Masatoshi Miyake
Keyword(s):  
Friction Coefficient ◽  
Bias Voltage ◽  
Wear Behavior ◽  
Vacuum Arc ◽  
Diamond Like Carbon ◽  
Wear Depth ◽  
Nanoindentation Hardness ◽  
Dc Bias ◽  
Filtered Cathodic Vacuum Arc ◽  
Disk Test

Diamond-like carbon (DLC) films are deposited by bend filtered cathodic vacuum arc (FCVA) technique with DC and pulsed bias voltage. The effects of varying bias voltage on nanoindentation and nanowear properties were evaluated by atomic force microscopy. DLC films deposited with DC bias voltage of −50 V exhibited the greatest hardness at approximately 50 GPa, a low modulus of dissipation, low elastic modulus to nanoindentation hardness ratio, and high nanowear resistance. Nanoindentation hardness was positively correlated with the Raman peak ratioId/Ig, whereas wear depth was negatively correlated with this ratio. These nanotribological properties highly depend on the films’ nanostructures. The tribological properties of the FCVA-DLC films were also investigated using a ball-on-disk test. The average friction coefficient of DLC films deposited with DC bias voltage was lower than that of DLC films deposited with pulse bias voltage. The friction coefficient calculated from the ball-on-disk test was correlated with the nanoindentation hardness in dry conditions. However, under boundary lubrication conditions, the friction coefficient and specific wear rate had little correlation with nanoindentation hardness, and wear behavior seemed to be influenced by other factors such as adhesion strength between the film and substrate.

DUPLEX Al2O3/DLC COATING ON 15SiCp/2024 ALUMINUM MATRIX COMPOSITE USING COMBINED MICROARC OXIDATION AND FILTERED CATHODIC VACUUM ARC DEPOSITION

2012 ◽  
Vol 19 (04) ◽  
pp. 1250036 ◽  
Author(s):  
WENBIN XUE ◽  
HUA TIAN ◽  
JIANCHENG DU ◽  
MING HUA ◽  
XU ZHANG ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Matrix Composite ◽  
Carbon Film ◽  
Microarc Oxidation ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Vacuum Arc ◽  
Low Friction ◽  
Dlc Coating ◽  
Filtered Cathodic Vacuum Arc

Microarc oxidation (MAO) treatment produces a thick Al2O3 coating on the 15SiCp/2024 aluminum matrix composite. After pretreatment of Ti ion implantation, a thin diamond-like carbon film (DLC) was deposited on the top of polished Al2O3 coating by a pulsed filtered cathodic vacuum arc (FCVA) deposition system with a metal vapor vacuum arc (MEVVA) source. The morphology and tribological properties of the duplex Al2O3 /DLC multiplayer coating were investigated by Raman spectroscopy, scanning electron microscopy (SEM) and SRV ball-on-disk friction tester. It is found that the duplex Al2O3 /DLC coating had good adhesion and a low friction coefficient of less than 0.07. As compared to a single Al2O3 or DLC coating, the duplex Al2O3 /DLC coating on aluminum matrix composite exhibited a better wear resistance against ZrO2 ball under dry sliding, because the Al2O3 coating as an intermediate layer improved load support for the top DLC coating on 15SiCp/2024 composite substrate, meanwhile the top DLC coating displayed low friction coefficient.

The Influence of Defects in ta-C Coating Deposited by FCVA Method on Their Tribological Behavior

2020 ◽  
Author(s):  
Woo-Young Lee ◽  
Young-Jun Jang ◽  
Takayuki Tokoroyama ◽  
Motoyuki Murashima ◽  
Noritsugu Umehara
Keyword(s):  
Steady State ◽  
Structural Changes ◽  
Tribological Behavior ◽  
Protective Coatings ◽  
Testing Temperature ◽  
Vacuum Arc ◽  
Friction Behavior ◽  
Dlc Coatings ◽  
Automobile Components ◽  
Filtered Cathodic Vacuum Arc

Abstract Diamond like-carbon (DLC) coatings is a form of amorphous consisting of sp2-bonded and sp3-bonded phase. Among the DLC series, DLC coatings containing a large percentage of sp3 ratio, referred as tetrahedral amorphous carbon (ta-C) coatings, have attracted significant attention as protective coatings in various fields such as tribological applications and automobile components that demand superior durability, chemical inertness and low friction at high temperature. Particularly, the filtered cathodic vacuum arc (FCVA) technique with an energetic plasma can deposit the ta-C coating, but it has a drawback such as decreasing deposition rate and occurring macroparticles. Research on morphological and structural change of defects in ta-C coatings fabricated by FCVA is important for understanding their wear and friction behavior. In this study, the types of defects presented on a ta-C coating were classified as spike, droplet and pore with their morphology, structural and mechanical properties. The tribological behavior of the coating was characterized by ball-on-disk test using a Si3N4 ball at a testing temperature of 170 °C. In order to confirm the effect of defects in the ta-C coating on the tribological behavior, the defects in a designated area were investigated as a function of different sliding cycles. Initially, a running-in cycle is maintained until 2,000 cycles, following which a steady-state value of 0.1 is observed from sliding cycles of 2,000 to 10,000. At the end of 10,000 cycles, the wear rate of the ta-C coating is 4.3 × 10−6 mm3/Nm. Structural changes among the defects are apparent on droplet and pore after the friction test at 170 °C. The nodular defects including spikes and droplet is grinded off on top surface of that and is retained until 1,000 cycles. In steady state up to 6,000 cycles, droplet was survived, on the other hand, the spikes are almost polished from sliding.

Effect of substrate bias on the tribological behavior of ta-C coating prepared by filtered cathodic vacuum arc

2017 ◽  
Vol 18 (5) ◽  
pp. 779-784 ◽  
Author(s):  
Yeoh Chin Ean ◽  
Young-Jun Jang ◽  
Jong-Kuk Kim ◽  
Willey Liew Yun Hsien ◽  
Nancy Julius Siambun ◽  
...  
Keyword(s):  
Tribological Behavior ◽  
Vacuum Arc ◽  
Substrate Bias ◽  
Filtered Cathodic Vacuum Arc
Sign in / Sign up

Export Citation Format

Share Document