A boron-doped diamond like carbon coating with high hardness and low friction coefficient

Wear ◽  
2019 ◽  
Vol 436-437 ◽  
pp. 203031 ◽  
Author(s):  
Zhencheng Ren ◽  
Haifeng Qin ◽  
Yalin Dong ◽  
G.L. Doll ◽  
Chang Ye
Keyword(s):  
Friction Coefficient ◽  
Carbon Coating ◽  
High Hardness ◽  
Diamond Like Carbon ◽  
Low Friction ◽  
Boron Doped Diamond ◽  
Boron Doped

Metallic contacts to nitrogen and boron doped diamond-like carbon films

2010 ◽  
Vol 518 (12) ◽  
pp. 3332-3336 ◽  
Author(s):  
F.M. Wang ◽  
M.W. Chen ◽  
Q.B. Lai
Keyword(s):  
Carbon Films ◽  
Diamond Like Carbon ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Metallic Contacts

scholarly journals Multiscale frictional behaviors of sp2 nanocrystallited carbon films with different ion irradiation densities

Friction ◽  
2020 ◽  
Author(s):  
Zelong Hu ◽  
Xue Fan ◽  
Cheng Chen
Keyword(s):  
Friction Coefficient ◽  
Contact Pressure ◽  
Electron Cyclotron Resonance ◽  
Ion Irradiation ◽  
Carbon Film ◽  
High Hardness ◽  
Carbon Films ◽  
Real Contact Area ◽  
Low Friction ◽  
Plasma Sputtering

Abstract sp2 nanocrystallited carbon films with large nanocrystallite sizes, smooth surfaces, and relative high hardness were prepared with different ion irradiation densities regulated with the substrate magnetic coil current in an electron cyclotron resonance plasma sputtering system. Their multiscale frictional behaviors were investigated with macro pin-on-disk tribo-tests and micro nanoscratch tests. The results revealed that, at an ion irradiation density of 16 mA/cm2, sp2 nanocrystallited carbon film exhibits the lowest friction coefficient and good wear resistant properties at both the macroscale and microscale. The film sliding against a Si3N4 ball under a contact pressure of 0.57 GPa exhibited a low friction coefficient of 0.09 and a long wear life at the macroscale. Furthermore, the film sliding against a diamond tip under a contact pressure of 4.9 GPa exhibited a stable low friction coefficient of 0.08 with a shallow scratch depth at the microscale. It is suggested that sp2 nanocrystallites affect the frictional behaviors in the cases described differently. At the macroscale, the contact interface via the small real contact area and the sp2 nanocrystallited transfer layer dominated the frictional behavior, while the sp2 nanocrystallited structure in the film with low shear strength and high plastic resistivity, as well as the smooth surface morphology, decided the steady low nanoscratch properties at the microscale. These findings expand multiscale tribological applications of sp2 nanocrystallited carbon films.

Sliding Wear Characteristics and Fabrication of LPS-SIC Ceramic by Sintering Additives

2007 ◽  
Vol 345-346 ◽  
pp. 1541-1544
Author(s):  
Han Ki Yoon ◽  
Sung Ho Park ◽  
Won Jo Park
Keyword(s):  
Friction Coefficient ◽  
Gas Turbines ◽  
Sliding Wear ◽  
Sintering Temperature ◽  
High Hardness ◽  
Wear Loss ◽  
Low Friction ◽  
Wear Characteristics ◽  
Sic Ceramic ◽  
High Temperature Components

Silicon carbide (SiC) materials have been extensively studied for high-temperature components in fusion blanket system and gas turbines, because they have excellent a hightemperature mechanical properties, high thermal conductivity and wear resistance. However, the brittle characteristics of SiC such as low strain-to fracture still impose a severe limitation on the practical application of SiC materials. Therefore, a study of the sliding wear characteristics and fabrication of SiC ceramic by sintering temperature and additives are need. As the result of abrasion, the friction coefficient of the monolithic SiC sintered at 1800°C was the lowest, and the friction coefficient of that sintered at 1760°C was the highest. The monolithic SiC manufactured at 1800°C showed the highest hardness and the lowest friction coefficient. The friction coefficient of the monolithic SiC sintered by the SiO2 contents of 2wt% was the lowest, and the friction coefficient that sintered by the SiO2 contents of 5wt% was the highest. 1800°C of sintering temperature and 2wt% of SiO2 contents ware shown high hardness, low friction coefficient and wear loss compare with other temperatures and SiO2 contents.

Trial on C3N4 Coating Cutter Hard-Dry Cutting on Hardened Steel

2010 ◽  
Vol 33 ◽  
pp. 483-486
Author(s):  
Hai Dong Yang ◽  
Xi Quan Xia ◽  
Zhen Hua Qing
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Tool Material ◽  
High Hardness ◽  
Hardened Steel ◽  
Hard Material ◽  
Low Friction ◽  
Dry Cutting ◽  
Coated Tool

The method of “cutting instead of grinding” on hardened steel is always attractive to engineers. To gain this aim the tool material must first be found. C3N4 is a new kind of super hard material and has comparable properties with diamond in high hardness, wear-resistance, low friction coefficient and thermal conductivity. A number of dry-cutting tests were carried out by C3N4-film coated tool on hardened steel, proved the coating tool is suitable for hard dry cutting.

Friction and wear behavior of hydrogenated diamond-like carbon coating against titanium alloys under large normal load and variable velocity

2017 ◽  
Vol 69 (2) ◽  
pp. 199-207 ◽  
Author(s):  
Jun Liu ◽  
Zhinan Zhang ◽  
Zhe Ji ◽  
Youbai Xie
Keyword(s):  
Friction Coefficient ◽  
Service Life ◽  
Carbon Coating ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Normal Load ◽  
Diamond Like Carbon ◽  
Content Type ◽  
Friction And Wear Behavior ◽  
Dlc Coating

Purpose This paper aims to investigate the effects of reciprocating frequency, large normal load on friction and wear behavior of hydrogenated diamond-like carbon (H-DLC) coating against Ti-6Al-4V ball under dry and lubricated conditions. Design/methodology/approach The friction and wear mechanisms are analyzed by scanning electron microscope, energy dispersive spectroscopy and Raman spectroscopy. Findings The results show that as reciprocating frequency increases under lubricated conditions, the friction coefficient decreases first and then increases. When the reciprocating frequency is 2.54 Hz, the value of friction coefficient reaches the minimum. The friction reduction is because of the transformation from sp3 to sp2, the formation of transfer layer on Ti-6Al-4V ball and the reduction in viscous friction, whereas the increase of friction coefficient is related to wear. In dry conditions, the friction coefficient is between 0.06 and 0.1. And, the service life of H-DLC coating decreases with the increase in reciprocating frequency and normal load. Research limitations/implications It is confirmed that adding the lubricant could prolong the service life of H-DLC coating and reduce friction and wear efficiently. And, the wear mechanisms under dry and lubricated conditions encompass abrasive wear and adhesive wear. Originality/value The results are helpful for application of diamond-like carbon coating.

Quaternary–matrix, nanocomposite self-lubricating PVD coatings in the system TiAlCN-MoS2 – structure and tological properties

2003 ◽  
Vol 788 ◽  
Author(s):  
V. Spassov ◽  
A. Savan ◽  
A. R. Phani ◽  
M. Stueber ◽  
H. Haefke
Keyword(s):  
Friction Coefficient ◽  
High Speed ◽  
High Hardness ◽  
Scratch Test ◽  
Hard Coatings ◽  
Work Piece ◽  
Low Friction ◽  
Dry Cutting ◽  
Productivity Cost ◽  
Temperature Oxidation

ABSTRACTNowadays the demands placed upon the tooling in processes such as cutting, drilling, milling, stamping, bending, etc. are constantly growing and restrictive. On one hand, productivity, cost efficiency and quality all require high-speed processes to be developed. On the other hand, environmental safety requires very little or no lubricant to be used (dry cutting or minimized spray-lubrication). When combined, these two considerations mean: the tool should wear very little, withstand high temperatures and the friction between the tool and the work piece should be minimized. An apparent approach to simultaneously satisfying such requirements is coating the tools with self-lubricating hard coatings. Quaternary TiAlCN is a rapidly developing hard coating suitable for a number of cutting applications. The well-known wear-resistant coating TiN has been demonstrated to have improved high-temperature oxidation resistance when aluminum is included, i.e. TiAl N. Addition of yet a fourth element, carbon, has the primary effect of lowering the high friction coefficient occurring between the ceramic coating and steel. The high hardness, toughness, heat resistance and low friction coefficient of TiAlCN make it the ideal candidate for applications such as milling, hobbing, tapping, stamping and punching. MoS2 is a well-known solid lubricant widely used as tribological coatings, especially for applications working in vacuum or dry environment. Combining the wear resistance of the quaternary TiAlCN matrix with the lubricating properties of MoS2 has an extremely beneficial effect in further improving the tribological performance of the resulting composite. The coatings were deposited on hardmetal (WC-Co) and Si (100) substrates using reactive magnetron sputtering. The structure of the coatings is studied by plain-view TEM and XTEM, electron diffraction and ED X. The tribological properties were examined by Pin-on-Disk (PoD) tribometer. The adhesion was estimated by scratch test, and the hardness was measured by nanoindentation. All the coatings examined had a very low friction coefficient (typically below 0.09) and volumetric wear rate against 100Cr6 steel (AISI 52100) of 7.10-7 mm3/N/m. The relation of deposition parameters to structure to properties is discussed. To the authors knowledge, this is the first paper describing quaternary TiAlCN matrix with inclusions of MoS2.

Electrode Characteristics of High Pressure Synthetic High Boron Doped Diamond

2006 ◽  
Vol 315-316 ◽  
pp. 507-510 ◽  
Author(s):  
Jian Bing Zang ◽  
Yan Hui Wang ◽  
W. Tang ◽  
H. Huang
Keyword(s):  
High Pressure ◽  
Carbon Sources ◽  
High Hardness ◽  
Diamond Powder ◽  
Grinding Wheel ◽  
Potential Range ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
High Boron ◽  
Electrode Characteristics

B-doped diamond is an excellent grinding material owing to its high hardness, oxidation resistance and chemical inertness as well as low resistance. The recent developments of Boron doped conductive diamond has further increased the scale of diamond applications including the manufacture of electrically conductive grinding wheel or the use as an electrode in EDM. The unique electrochemical properties also attract the researchers’ attention on the applications of electrode, sensor and detectors etc. This paper presents a viable technology that high boron doped diamond is synthesized under high pressure and high temperature using B-doped GICs as carbon sources. The synthetic diamond grains with electrically resistivity of 2cm are sufficiently conductive for electrochemistry measurement. Cyclic voltammotry was performed to evaluate the electrode characteristics of diamond powder. The results shows that B-doped diamond powder electrode is electrochemically stable in the supporting electrolytes such as 0.1M KCl, 0.5M Na2SO4 and 0.1M H2SO4 over a wide potential range. The level of background current is very low. The electrode reaction is quasi-reversible in 0.5M Na2SO4 containing the ferricyanide-ferrocyanide redox couple.

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