low friction of crn coatings in presence of glycerol

[PDF] Superlubricity and tribochemistry of polyhydric

The anomalous low friction of diamondlike carbon coated surfaces lubricated by pure glycerol was observed at 80 C Steel surfaces were coated with an ultrahard 1 m thick hydrogen-free tetrahedral coordinated carbon (ta-C) layer produced by physical vapor deposition In the presence of glycerol the friction coefficient is below 0 01 at steady state corresponding to the so-called

Super

Friction 2(2): 156–163 (2014) ISSN 2223-7690 DOI 10 1007/s40544-014-0047-1 CN 10-1237/TH RESEARCH ARTICLE Super-low friction of ta-C coating in presence of oleic acid Makoto KANO1 Jean Michel MARTIN2 * Kentaro YOSHIDA1 Maria Isabel DE BARROS BOUCHET2 1 Division of Mechanical Material Engineering Kanagawa Industrial Technology Center 705-1 Shimo-Imaizumi

A review on the importance of surface coating of micro

Nov 19 2015Low friction of the coatings is contributed by the long and flexible backbones of SAM Long backbones cause low friction as well as high wear resistance whereas short backbones possess relatively higher friction and low wear resistance In a SAM coating the strong affinity of the head groups with the substrate provides an effective thin

Surface Coatings Technology

to form multi (nano)-layered coatings offers some advantages as a starting point Cr(N) is suggested because of its excellent wear and oxidation resistance to about 800 C [12 13] and Mo(N) [14] because it is likely to oxidize at about 500 C forming its low friction oxide MoO 3 The presumption is that the Mo-oxide will reduce the cutting

Continuously Growing Ultrathick CrN Coating to Achieve

The scratch test and friction test results both show that the load-bearing capacity of coating is significantly increased as CrN coatings growing thicker During the scratch test the ultrathick CrN coating of thickness 80 6 μm is not failed under the load of 180 N and the dominant failure mechanism is the cohesive failure including wedge

COMPARATIVE INVESTIGATION OF CrN CrCN AND CrSiCN

The X-ray diffraction patterns of the CrN CrCN and CrSiCN coatings are shown in Fig 1 The diffractogram for the CrN coating shows the formation of the β-Cr 2 N phase (hexagonal structure) being detected the (110) (002) (200) (300) and (220) reflections whose positions are close to those given in ICSD00-035-0803 It

Research Article Structure and Friction Behavior of CrN /a

angle clustering of the sp 2 phase presence of sp 2 rings or chains and sp 2-to-sp 3 ratio [ ] In order to investigate the bonded structure of carbon in the CrN /a-C:H lms we have studied the Raman spectra of the CrN /a-C:H lms to distinguish di erent bonding types of carbon Figure shows the Raman spectra of the CrN and CrN /a-C:H lms

Friction and wear behaviour of CrN coating at temperatures

Feb 26 2007The friction and wear characteristics of the CrN coating prepared by low arc deposition method were examined at different temperatures and with different counter-part materials The tribological performance was evaluated with respect to coating characteristics wear rate of the ball and the coating friction coefficient degree of oxidation and

CORROSION RESISTANCE OF CrN/NbN SUPERLATTICE

4 1 Phase composition and texture of the various CrN/NbN superlattice coatings Low angle XRD patterns from the CrN/NbN coatings deposited in cathodic arc ABS and UBM modes are shown in Fig 2a The superlattice periods for the cathodic arc ABS and UBM deposited coatings were 3 8 nm 3 2 nm and 3 7 nm respectively see Table 2

Tribological performance of CrN and CrN/GLC coated

Modern automotive systems strictly demands increased mechanical and thermal loads a longer service life and the weight reduction Low friction hard coatings are extensively used in power train and engine applications by wear inhibition and friction reduction The present study evaluates friction and wear responses of CrN and CrN/GLC coatings in different lubricated conditions Results showed

Continuously Growing Ultrathick CrN Coating to Achieve

The scratch test and friction test results both show that the load-bearing capacity of coating is significantly increased as CrN coatings growing thicker During the scratch test the ultrathick CrN coating of thickness 80 6 μm is not failed under the load of 180 N and the dominant failure mechanism is the cohesive failure including wedge

The Mechanism of Glycerol Superlubricity

Glycerol is a highly viscous liquid generating friction coefficient of 0 1 and up for bearing steels in boundary lubrication In full film EHL pure glycerol generates high friction as well and therefore is rarely used as a lubricant It is on the other hand non-toxic and bio degradable hence attractive for use in sensitive applications

Pushing the Limits of Performance

hard low friction wear resistant coatings based on PVD PACVD and CVD technologies for a wide range of applications It has a global presence with coating centers in strategic locations across Europe Asia and North America and has one of the largest coating networks in the world

CORROSION RESISTANCE OF CrN/NbN SUPERLATTICE

4 1 Phase composition and texture of the various CrN/NbN superlattice coatings Low angle XRD patterns from the CrN/NbN coatings deposited in cathodic arc ABS and UBM modes are shown in Fig 2a The superlattice periods for the cathodic arc ABS and UBM deposited coatings were 3 8 nm 3 2 nm and 3 7 nm respectively see Table 2

Tribological performance of CrN and CrN/GLC coated

Modern automotive systems strictly demands increased mechanical and thermal loads a longer service life and the weight reduction Low friction hard coatings are extensively used in power train and engine applications by wear inhibition and friction reduction The present study evaluates friction and wear responses of CrN and CrN/GLC coatings in different lubricated conditions Results showed

Surface Coatings Technology

to form multi (nano)-layered coatings offers some advantages as a starting point Cr(N) is suggested because of its excellent wear and oxidation resistance to about 800 C [12 13] and Mo(N) [14] because it is likely to oxidize at about 500 C forming its low friction oxide MoO 3 The presumption is that the Mo-oxide will reduce the cutting

Low friction of CrN coatings in presence of glycerol

Jun 01 2020The friction and wear of CrN coatings can be greatly improved when lubricated by glycerol CrN-250 coating presents the lowest friction coefficient and the least wear showing excellent lubrication performance (3) XPS analysis shows that FeOOH is produced on both the steel ball and the CrN flat during friction by degradation of glycerol

INFLUENCE OF INCREASED SLIDING SPEED ON THE

building industry Thus the above coatings of TiN and CrN system demonstrate a wide range of high performance indicators: necessary wear resistance adhesion between the coating and the substrate low coefficient of friction corrosion resistance etc [2-6] Therefore such coatings

Friction behaviour of hydrophilic lubricious coatings for

hydrophilic lubricious coating development Key words: friction coefficient chitosan coatings hydrogels catheter coatings 1 Introduction Rapid progress and increasing needs in the biomedical field have contributed to the extensive development of polymeric coatings Many of the improvements of currently used devices and new

Low friction of CrN coatings in presence of glycerol

The tribological properties of CrN coatings under lubrication by glycerol were investigated by using a micro-friction and wear tester The results show that excellent lubrication performance of CrN coating under lubrication by glycerol The action mechanism of glycerol in steel/CrN system is proposed with help of X-ray photoelectron spectroscopy

Continuously Growing Ultrathick CrN Coating to Achieve

The scratch test and friction test results both show that the load-bearing capacity of coating is significantly increased as CrN coatings growing thicker During the scratch test the ultrathick CrN coating of thickness 80 6 μm is not failed under the load of 180 N and the dominant failure mechanism is the cohesive failure including wedge

CrN/NbN coatings deposited by HIPIMS techniques: a

Low friction coefficient (0 46) and dry sliding wear coefficient -Kc (1 22 x 10-15) were recorded The effect of superior microstructure (droplet defect and intergranular void free) on erosion-corrosion resistance has been evaluated by subjecting the coatings to a slurry impingement (Na2CO3+ NaHCO3 buffer solution with Al2O3 particles of size

DLC and Glycerol: Superlubricity in Rolling/Sliding

Low friction is one of the most important parameters for the development of machine components and machines with high efficiency Many of the common machine components of today such as gears rolling element bearings and cam-followers are defined by their non-conformal contacts leading to high-contact pressures typically 1–4 GPa The lubrication of such contacts is usually called

Ultralow friction of DLC in presence of glycerol mono

This paper presents a unique tribological system that is able to produce no measurable wear of material combination and that reduces friction markedly in the ultralow regime under boundary lubrication Ultralow friction (0 03) was obtained by sliding hydrogen-free Diamond-Like-Carbon ta-C against ta-C lubricated with Poly-alpha Olefin base oil containing Glycerol Mono-Oleate (GMO) additive

[PDF] Superlubricity and tribochemistry of polyhydric

The anomalous low friction of diamondlike carbon coated surfaces lubricated by pure glycerol was observed at 80 C Steel surfaces were coated with an ultrahard 1 m thick hydrogen-free tetrahedral coordinated carbon (ta-C) layer produced by physical vapor deposition In the presence of glycerol the friction coefficient is below 0 01 at steady state corresponding to the so-called

DLC Coating Technology Applied to Sliding Parts of

Additionally the material combination of ta-C/ta-C lubricated with pure glycerol has a superlow friction coefficient of below 0 01 (8) These experimental results obtained by rig tests are shown in detail in this paper Reducing the friction between the cam and the follower is effective in the low-engine-

TRIBOLOGICAL BEHAVIOUR OF W

Diamond-like carbon (DLC) coatings are known for their low coefficient of friction (COF) and low wear rate against aluminum compared to the other surface coatings (i e CrN TiN) tested under the ambient conditions [1-6] Studies showed that the hydrogen content of the DLC coatings influences friction and wear properties of DLC coatings [7-10]