Tribological Properties of PVD CrAlN Coating Tools

2013 ◽  
Vol 706-708 ◽  
pp. 375-378
Author(s):  
Ai Hua Liu ◽  
Jian Xin Deng ◽  
Peng Zhang
Keyword(s):  
Tribological Properties ◽  
High Speed ◽  
Vapour Deposition ◽  
Test System ◽  
Test Results ◽  
Wear Properties ◽  
Low Load ◽  
Cathodic Arc ◽  
Wear Tests ◽  
Ball On Disc

The paper reports the tribological properties of the CrAlN coating tools at different speeds and loads. The coating was deposited on cemented carbide by cathodic arc physical vapour deposition technique. Ball-on-disc wear tests were performed on the CETR UMT-2 test system against SiC balls. The coating character and test results were obtained through SEM, XRD and Wyko surface profilometer. The results are as follows: The value of friction of coefficients decreased and depth of wear tracks became sallower as speeds increased and the coating presented adhesion phenomenon under low load. CrAlN coating showed excellent anti-wear properties at high speed and low load, and was more suitable for these similar working conditions.

Friction and Wear Behaviors of CAPVD TiAlN Coating

2013 ◽  
Vol 645 ◽  
pp. 101-104
Author(s):  
Ai Hua Liu ◽  
Ze Shen Liu ◽  
Peng Zhang
Keyword(s):  
High Speed ◽  
Friction And Wear ◽  
Vapour Deposition ◽  
Test System ◽  
Test Results ◽  
Wear Properties ◽  
Tialn Coating ◽  
Cathodic Arc ◽  
Wear Tests ◽  
Ball On Disc

The paper reports friction and wear study of TiAlN coating at different speeds and loads. The coating was deposited on YG6 (WC+6 wt.% Co) cemented carbide by cathodic arc physical vapour deposition technique. Ball-on-disc wear tests were performed on the CETR UMT-2 test system against SiC balls. The coating character and test results were obtained through SEM, XRD and Wyko surface profilometer. The results are as follows: The value of friction of coefficients decreased and depth of wear tracks became smaller as speeds and loads increased. TiAlN coating showed excellent anti-wear properties at high speed and high load, and was more suitable for these similar working conditions.

Wear and Friction Properties of TiN,TiAlN and CrAlN PVD Coatings

2011 ◽  
Vol 697-698 ◽  
pp. 436-439
Author(s):  
Ai Hua Liu ◽  
Jian Xin Deng ◽  
Hui Zhang ◽  
Yun Song Lian ◽  
Jun Zhao
Keyword(s):  
High Speed ◽  
Test System ◽  
Hard Coatings ◽  
Wear Behaviour ◽  
Test Results ◽  
Pvd Coatings ◽  
Wear Rates ◽  
Wear And Friction ◽  
Wear Tests ◽  
Ball On Disc

The paper reports a comparative study of the tribological properties of the most employed hard coatings like TiN, TiAlN and CrAlN. Ball-on-disc wear tests were performed on the CETR UMT-2 test system against Si3N4balls with a relatively high speed of 100m/min. The coating character and test results were obtained through SEM, XRD and Wyko surface profilometer. The results are as follows: The friction coefficients of the three coatings are relatively high because of the superabundant wear debris during tests. The wear behaviour and wear tracks exist distinct differences for different coatings. As for wear rates, the sequence of three coatings is TiN>TiAlN>CrAlN, the combination property of CrAlN is the best.

The Improved Friction Properties of Bonded MoS2 Films by MAO Treating of Al Substrate

2013 ◽  
Vol 275-277 ◽  
pp. 1911-1914 ◽  
Author(s):  
Han Jun Hu ◽  
Hui Zhou ◽  
Yu Gang Zheng ◽  
Kai Feng Zhang ◽  
Zhi Hua Wan
Keyword(s):  
Tribological Properties ◽  
Solid Lubricants ◽  
Ceramic Coatings ◽  
Test System ◽  
Test Method ◽  
Test Results ◽  
Specimen Test ◽  
Micro Arc Oxidation ◽  
A New Technique ◽  
Porous Microstructures

The bonded MoS2 films are widely used as solid lubricants in aerospace mechanisms due to their excellent tribological properties. Traditionally, the MoS2 was directly bonded on the Al substrate that was only treated by the technique named of sandblast. For improving the tribological properties of MoS2 films, micro arc oxidation (MAO) instead of sandblast was introduced as a new technique for treating of Al substrate. In this article, the tribological properties of MoS2 films which were bonded on different surface of Al substrate as mentioned above were discussed, respectively. It was concluded from the test results that the MoS2 films bonded on substrate treated by MAO have better tribological properties than those samples treated by sandblast. The endurance life against abrasion of the former is as high as twenty times of the latter by the stand test method of ball on disk using the UMT Multi-Specimen Test System. This test results could be illustrated by the following reasons. The first is the porous microstructures of MAO ceramic coatings on the Al substrate. The coatings have numerous pits to be good at increasing the binding force with the MoS2 films, and the pits can also provide a MoS2 lubricants reservoir during processes of friction. Both of them improved the MoS2 film’s ability of wear-protective. The second is that hardness of the coating is higher than the Al, and this ensures well wearing resistance, especially in practical application to big load-supporting moving parts, such as bearing, gear, etc…

scholarly journals Effects of Reduced Graphene Oxide (rGO) at Different Concentrations on Tribological Properties of Liquid Base Lubricants

Lubricants ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 11 ◽  
Author(s):  
Jankhan Patel ◽  
Amirkianoosh Kiani
Keyword(s):  
Graphene Oxide ◽  
Physical Properties ◽  
Reduced Graphene Oxide ◽  
Tribological Properties ◽  
High Speed ◽  
Friction And Wear ◽  
Control Sample ◽  
Wear Properties ◽  
Reduced Graphene ◽  
Friction And Wear Properties

In this study, reduced graphene oxide (rGO) nano platelets were used as an additive to enhance friction and wear properties of oil-based lubricants by preparing three samples at 0.01% w/w, 0.05% w/w, and 0.1% w/w concentrations. To analyze the direct effect of rGO nano platelets on tribological properties, 99.9% pure oil was used as a liquid lubricant. A comparative tribological study was done by performing a ball-on-disk wear test in situ under harsh conditions, which was further analyzed using a non-contact 3D optical profilometer. Morphological evaluation of the scar was done using transmission and scanning electron microscopy (TEM, SEM) at micro and nano levels. The lubricants’ physical properties, such as viscosity and oxidation number, were evaluated and compared for all samples including pure oil (control sample) as per ASTM standards. Findings of all these tests show that adding rGO nano platelets at 0.05% w/w showed significant reduction in friction at high speed and in wear up to 51.85%, which is very promising for increasing the life span of moving surfaces in machinery. Oxidation and viscosity tests also proved that adding rGO nano platelets to all samples does not sacrifice the physical properties of the lubricant, while it improves friction and wear properties.

scholarly journals The Influence of Disc Surface Topography after Vapor Blasting on Wear of Sliding Pairs under Dry Sliding Conditions

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 102 ◽  
Author(s):  
Dzierwa ◽  
Pawlus ◽  
Zelasko
Keyword(s):  
Surface Topography ◽  
Tribological Properties ◽  
White Light ◽  
Dry Friction ◽  
Dry Sliding ◽  
Disc Surface ◽  
Steel Disc ◽  
42Crmo4 Steel ◽  
Wear Tests ◽  
Ball On Disc

Wear tests were performed using a ball-on-disc tribological tester. In this study, 42CrMo4 steel disc of hardness 40 HRC co-acted with 100Cr6 steel ball with hardness of 60 HRC. Disc surfaces were created using vapor blasting to obtain values of the Sq parameter close to 5 µm. However, other disc surface topography parameters varied. Dry friction tests were carried out. Wear levels of discs and balls were measured using a white light interferometer Talysurf CCI Lite. It was found that the surface topography had a significant impact on tribological properties under dry sliding conditions. The research also allowed to identify significant dependencies between surface topography parameters and wear.

Tribological properties of bronze surface with dimple textures fabricated by the indentation method

2020 ◽  
Vol 234 (10) ◽  
pp. 1680-1694
Author(s):  
Jianzhao Wu ◽  
Aibing Yu ◽  
Qiujie Chen ◽  
Maochao Wu ◽  
Lei Sun ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Wear Debris ◽  
Surface Texturing ◽  
Experimental Results ◽  
Indentation Method ◽  
Dimple Surface ◽  
Mechanical Components ◽  
Wear Tests ◽  
Ball On Disc ◽  
Worn Surfaces

Surface texturing is an effective approach to improve the tribological properties of mechanical components. An indentation method is presented to fabricate dimple textures on bronze specimen surfaces. Graphite was selected as the mating balls in ball-on-disc wear tests. The worn surfaces and the indented dimples heaped with the thin ribbon debris were observed by microscope. The morphology and evolution of wear debris were employed to explain the influence of indented dimple textures. The experimental results indicate that the generation of thin ribbon debris is due to the edge hardening of indented dimple. The thin ribbon debris and the indented conical dimple are conducive to the debris heaping on slopes of dimples, which can facilitate the formation of the graphite-rich transfer layers on indented dimple surface. Compared with nontextured surface, indented dimple surface has lower coefficients of friction and slighter wear. The tribological properties of indented dimple surface are improved because of the edge hardening, the debris heaping and the formation of transfer layers.

Effect of Electric Current and Sliding Speed on Wear Rate of Metallized Carbon Strip Sliding against Copper Trolley

2004 ◽  
Vol 449-452 ◽  
pp. 773-776
Author(s):  
H.J. Kim ◽  
J.K. Lee ◽  
E.Y. Jeong ◽  
Jung Chan Bae ◽  
Moo Young Huh
Keyword(s):  
High Speed ◽  
Carbon Materials ◽  
Pure Copper ◽  
Testing Machine ◽  
Wear Testing ◽  
Wear Properties ◽  
Baking Process ◽  
Testing Data ◽  
Electric Railway ◽  
Wear Tests

Pure copper and copper alloy infiltrated carbon materials were newly developed for the application of the contact strip on the pantograph system of high-speed electric railway. After the compaction and following baking process at an elevated temperature, the shape and size of pores in carbon materials were controlled by the processes developed in this work. The infiltration of pure copper or copper silicon alloy was performed in a specially designed chamber equipped with an evacuation system by a diffusion pump and also a pressurizing system by a high pressure gas. In order to evaluate the performance of metallized carbon strip samples, the wear tests were performed in a wear testing machine which was designed for an actual operating condition for the high-speed electric railway. Wear properties of samples were discussed by tacking various wear testing data.

Tribology Performance of Compound Synthetic Lubricant Containing MoDTC

2013 ◽  
Vol 645 ◽  
pp. 137-140
Author(s):  
Zong Ying Shu ◽  
Yan Qiu Xia ◽  
Xiang Yu Ge
Keyword(s):  
Tribological Properties ◽  
High Speed ◽  
Friction And Wear ◽  
Synthetic Lubricant ◽  
Wear Properties ◽  
Friction Reducing ◽  
Tribology Performance

In this paper, dialkyl dithiocarbamate molybdenum (MoDTC) as a friction reducing additive was used for compound synthetic lubricant. The tribological properties of MoDTC were investigated using the MFT-R 4000-high-speed reciprocating friction and wear tester. And the results showed that the PAO +10wt% PEG +0.3wt% MoDTC have the best friction reducing and anti-wear properties.

scholarly journals Wear Characteristics of FeW/FeW-B4C Coatings Produced by TIG Process

2017 ◽  
Vol 62 (4) ◽  
pp. 2001-2006
Author(s):  
S. Islak
Keyword(s):  
Wear Behavior ◽  
Cost Effective ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Cost Effective Approach ◽  
Low Levels ◽  
Disc Configuration ◽  
Wear Tests ◽  
Ball On Disc

AbstractIn this study, wear properties of FeW-B4C coatings produced by tungsten inert gas (TIG) process on the AISI 1060 steel were investigated. TIG process was selected because it is a cost-effective approach for melting-based coatings. The treated surfaces were evaluated and characterized by means of scanning electron microscope (SEM), X-ray diffraction analysis, and electron dispersive spectrometry (EDS). The microhardness and wear experiment were also performed by using a microhardness machine and ball-on-disk tribometer. SEM observations showed that the obtained coating had a smooth and uniform surface. According to XRD analysis, borides and carbides phases formed in the coatings. The wear behavior of the coatings was compared with ball-on-disc configuration wear tests, at the same conditions. Average coefficient of friction values of the coatings were obtained at relatively low levels.

scholarly journals Preparation and Tribological Properties of Lanthanum Stearate Modified Lubricating Oil for Wire Rope in a Mine Hoist

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5821
Author(s):  
Yewei Zhang ◽  
Qing Zhang ◽  
Yuxing Peng ◽  
Chen Wang ◽  
Xiangdong Chang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Tribological Properties ◽  
High Speed ◽  
Wire Rope ◽  
Dispersion Stability ◽  
Lubricating Oil ◽  
Wear Properties ◽  
Wear Scar Diameter ◽  
Good Thermal Stability ◽  
Mine Hoist

In view of the serious friction and wear on the surface of a hoisting wire rope caused by the failure of lubrication under severe hoisting conditions, a study on the tribological characteristics of lanthanum stearate modified lubricating oil (LSMLO) was carried out. First, lanthanum stearate was prepared by the saponification reaction, and its surface morphology, chemical structure, thermal stability, and dispersion stability in IRIS-550A lubricating oil (IRIS) for wire rope were analyzed. Then, the tribological properties of LSMLO were investigated through four-ball friction tests and sliding wear tests of wire ropes. The results show that stearic acid almost completely reacts to produce lanthanum stearate, which has good thermal stability and a disordered layered structure. With the help of oleic acid, the dispersion stability of lanthanum stearate in IRIS can be significantly improved. The four-ball friction tests show that the optimal addition amount of lanthanum stearate in IRIS is 0.2 wt.%, and the CoF and wear scar diameter are reduced by about 35% and 25% respectively when lubricated with LSMLO compared to that with IRIS. LSMLO can better reduce the wear of the wire rope under different sliding speeds and contact loads than IRIS, and it exhibits improved anti-friction and anti-wear properties under high speed and low load.

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