Study on Tribological Properties of n-SiO2/FeS Solid Lubrication Composite Coating

2011 ◽  
Vol 694 ◽  
pp. 914-918
Author(s):  
Yu Qiang Zhao ◽  
Yan Zang ◽  
Yu Lin Qiao ◽  
Shan Lin Yang
Keyword(s):  
Friction Coefficient ◽  
Composite Coating ◽  
Tribological Properties ◽  
Treatment Process ◽  
Solid Lubrication ◽  
Vacuum Impregnation ◽  
Comprehensive Treatment ◽  
Low Friction ◽  
Duplex Coating ◽  
Lubrication Mechanisms

The n-SiO2/FeS solid lubrication composite coating is prepared by means of the comprehensive treatment process of gridded laser quenching, low temperature ion sulfuration and vacuum impregnation technology. The tribological properties of n-SiO2/FeS solid lubrication composite coating are investigated under the condition of dry sliding, and the lubrication mechanisms are also preliminary discussed. The experiment results reveal that the friction coefficient of the coating is in the range of 0.065~0.10 when tested in 4067 minutes. Furthermore, its wear rate is only 6% of FeS solid lubrication duplex coating. This is testified that the n-SiO2/FeS solid lubrication composite coating is durable with low friction coefficient and wear resistance.

Research on Lubrication and Wear-Resistant Mechanism of Ni60A/MoS2 Composite Coating

2011 ◽  
Vol 189-193 ◽  
pp. 231-235
Author(s):  
Yun Cai Zhao ◽  
Li Wang
Keyword(s):  
Friction Coefficient ◽  
Composite Coating ◽  
Friction Surface ◽  
Testing Machine ◽  
The Self ◽  
Wear Testing ◽  
Friction Property ◽  
Low Friction ◽  
Coverage Area ◽  
Lubricating Film

The influence of MoS2 lubrication phase on the tribological properties of the Ni60A/MoS2 composite coating was conducted on UMT-2 micro-wear testing machine (USA), discussing the self-lubricating effect and mechanism. The result shows that with the increasing content of MoS2, the friction coefficient of the coating which changed with the increasing content of the MoS2 presents firstly decreases then increases, and the value reach the minimum when the quality percent of MoS2 wrapped with Nickel is 35%. Low-friction property of the Ni60A/MoS2 composite coating is due to the forming of MoS2 lubricating film in friction surface. The decreasing of the friction coefficient of the coating is in proportion to the coverage area of MoS2 lubricating film.

Assessment of Tribological Properties of Low Friction Thin Layers Produced by Vacuum Methods

2019 ◽  
Vol 293 ◽  
pp. 125-140
Author(s):  
Agnieszka Paradecka ◽  
Krzysztof Lukaszkowicz ◽  
Jozef Sondor
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Chemical Analysis ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Structural Changes ◽  
Thin Layers ◽  
Low Friction ◽  
Topographic Analysis ◽  
Steel Substrates

Low friction thin layers are an excellent alternative for conventional coatings. They provide increased life of the elements, to which they were applied, due to enhancing the hardness or chemical and electrochemical resistance. They help to avoid the cracks, oxidation, as well as possible structural changes during the element's work. However, they primarily improve tribological properties by increasing wear resistance and reducing the friction. This also applies to components operating under variable conditions such as load, speed, temperature. The presented article analyzes the properties of various low-friction thin layers deposited by vacuum methods on the steel substrates. DLC, TiC, MoS2, CrCN thin layers were chosen, as they achieve the lowest possible coefficient of friction. In the framework of this work the measurements of adhesion of the investigated layers to the substrate as well as the friction coefficient, chemical analysis, microstructure and topographic analysis of the low-friction layers were carried out.

Tribological Properties of FeCrNi/CBN Composite Coating with Spraying High Velocity Arc

2011 ◽  
Vol 314-316 ◽  
pp. 74-77
Author(s):  
Cun Xiang Liu ◽  
Jun Hui Zhang ◽  
Zhao Feng Wang
Keyword(s):  
Friction Coefficient ◽  
Composite Coating ◽  
Cross Section ◽  
Tribological Properties ◽  
High Velocity ◽  
Composite Coatings ◽  
Structure Characteristic ◽  
High Bond ◽  
High Bond Strength ◽  
Run Up

The Tribological properties of FeCrNi/CBN composite coating with spraying high velocity arc is studied. Images and components and cross-section microstructure of coatings are analyzed by the means of SEM, and EDS etc. This research indicates that FeCrNi/CBN composite coatings have typical layered structure characteristic and high bond strength and hardness. Friction coefficient of coatings at room and high temperatures have “Run-up” period. With the increase of temperature, friction coefficient of coatings becomes low and wearing capacity of coatings becomes high. The adding of CBN powder highly improved the wearing capacity of coatings.

A Study on the Tribological Properties of DLC Films Deposited with Different Reaction Gases

2005 ◽  
Vol 903 ◽  
Author(s):  
Yong Ki Cho ◽  
Gang San Kim ◽  
Kyoung Il Moon ◽  
Sang Gweon Kim ◽  
Sung Wan Kim
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Hydrogen Content ◽  
Automobile Industry ◽  
High Strength ◽  
Optical Microscope ◽  
Low Friction ◽  
Pulsed Dc ◽  
Graphite Structure ◽  
Steel Substrates

AbstractDiamond like carbon (DLC) coatings have attracted great attention for use in various applications in automobile industry and machinery because they have excellent properties such as low friction coefficient and ultra high strength. The low friction coefficient of DLC comes from anti-adhesion with other materials, smooth surface, lubrication of graphite structure at the contacting point of films, and the hydrogen content of the films. Many researches have been focused on the microstructure effects on the tribological properties of DLC films but few have been reported on the effect of hydrogen content. In this study, the effect of hydrogen content on the friction coefficient of DLC films has been investigated.DLC films have been deposited on D2 steel by plasma enhanced CVD (Pulsed DC PECVD) method with different precursor gas of C2H2and CH4and different gas pressure. The effects of gas composition on the hydrogen content in DLC films and the resulting tribological properties have been reviewed. Si interlayer was deposited on D2 to improve adhesion of DLC on steel substrates. The characteristics of microstructure were evaluated by Raman spectroscope and composition was measured by RBS and EDS. The tribological behaviors of DLC films were investigated using ball on disk tribometer. The hardness of films was examined by nano-indenter. The failure mechanism of DLC deposited on steel substrates was examined using optical microscope and SEM/EDS. The results showed that the friction coefficient of DLC films deposited with C2H2was 0.06 and that of the film with CH4was 0.15. The friction coefficient improved with decreasing hydrogen content in DLC films.

Tribological Properties Between a-C:H Coatings and SiO2 at High Temperature

2020 ◽  
Author(s):  
Noritsugu Umehara ◽  
Kota Konishi ◽  
Motoyuki Murashima ◽  
Takayuki Tokoroyama
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Track ◽  
Severe Damage ◽  
Friction Test ◽  
Low Friction ◽  
Disk Friction

Abstract Tribological properties of a-C:H coatings has been investigated in various friction conditions. It is clear that temperature and mating materials give effects on tribological properties. In this study, we especially focus on the effect of mating material on its tribological properties of a-C:H coatings. Ball-on-disk friction test is conducted between a-C:H coating and 5 kinds of mating material, which is SiC, SiC(O)_800 (SiC oxidized at 800°C), SiC(O)_1050°C, SiC(O)_1300°C, and Quartz glass. It is found that a-C:H coatings shows low friction coefficient and low specific wear rate when O/Si ratio of the element content of mating material is 2, in other words, mating material is SiO2. In the wear scar of a-C:H coating after friction test with SiC, severe damage was confirmed. It is considered that a-C:H coating and SiO2 show low adhesion even at high temperature, which leads low friction and wear. Compared SiC(O) with Quartz, the friction coefficients with a-C:H coatings are respectively 0.013 and 0.038. Even though SiC(O) and Quartz are both SiO2, the tribological properties are different. On the wear track of SiC(O), transferred things from a-C:H coating are confirmed.

Research on the Tribological Properties of SF Polymer Water-Lubricated Bearings

2010 ◽  
Vol 150-151 ◽  
pp. 102-107 ◽  
Author(s):  
Zhu Xin Wu ◽  
Lin Liu Zheng ◽  
Fa Xiao Fan
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Load Capacity ◽  
Low Friction ◽  
Swelling Properties ◽  
Shipbuilding Industry ◽  
Simulation Testing ◽  
New Type ◽  
Water Swelling ◽  
High Load Capacity

In the paper, the SF polymer water lubricated bearings is taken as the research objects. Both material testing and bearing simulation testing are carried out to research the tribological properties of bearings including water swelling properties, friction coefficient, and wear-resistant properties mainly. The results show that the SF material, which is a new type of material used in water lubricated tail bearing, has the characteristics of low friction coefficient, high load capacity, good wear-resistance, excellent self-lubricating properties, and low water swelling, which has a broad application in the shipbuilding industry.

The Effect of Ni-P Alloy Pre-Plating on the Performance of Ni-P/Ni-P-PTFE Composite Coatings

2013 ◽  
Vol 561 ◽  
pp. 537-541 ◽  
Author(s):  
Jun Ying Hou ◽  
Song Rui Wang ◽  
Zhi Wei Zhou
Keyword(s):  
Corrosion Resistance ◽  
Friction Coefficient ◽  
Composite Coating ◽  
Composite Coatings ◽  
Low Friction ◽  
Excellent Performance ◽  
Ptfe Composite ◽  
Good Corrosion Resistance ◽  
Time Ratio ◽  
Composite Plating

In order to obtain more excellent performance of composite coating, a layer of Ni-P alloy was plated firstly, then Ni-P-PTFE composite coatings was plated. If plating time ratio of electroless plating Ni-P alloy and Ni-P-PTFE composite plating was properlly controlled, performance of pure Ni-P-PTFE composite coating could be improved. The study have shown that the total plating time is 2 hours, and the plating time ratio is 1:1, and good bonding strength with the substrate, right hardness, low friction coefficient, good corrosion resistance of Ni-P /Ni-P-PTFE composite coatings have been obtained.

Formation Mechanisms of Tribo-Coating for Low Friction in UHV

2005 ◽  
Author(s):  
Koshi Adachi ◽  
Hisakazu Sato ◽  
Koji Kato
Keyword(s):  
Friction Coefficient ◽  
Composite Structure ◽  
Solid Lubricant ◽  
Silicon Oxide ◽  
Solid Lubricants ◽  
Solid Lubrication ◽  
Formation Mechanisms ◽  
Coating Film ◽  
Low Friction ◽  
Indium Film

Solid lubrication film formed by tribo-coating, which deposits a solid lubricant by evaporation to the contact interface during friction in vacuum, gives low friction coefficient below 0.03 that can not be observed by any other solid lubricants of soft metals. The tribo-coating film formed on the pin has nano-order composite structure which the crystalline indium of nano size are distributed in an amorphous matrix of silicon oxide and chromium oxide. Because of the nano composite structure, a very thin indium film is formed without break down like conventional pre-coated thin film. The thinner indium film can give smaller value of friction coefficient than that of conventional solid lubricant.

Research of Electrodeposited RE-Ni-Fe-P-PTFE Composite Coating

2011 ◽  
Vol 214 ◽  
pp. 93-96
Author(s):  
Hao Chen ◽  
Jin Hui Li ◽  
Jian Gao Yang
Keyword(s):  
Rare Earth ◽  
Friction Coefficient ◽  
Composite Coating ◽  
Chemical Properties ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Low Friction ◽  
Ptfe Composite ◽  
Lubricating Property ◽  
Physical And Chemical

Composite coating is a very important part in new materials because it has special excellent physical and chemical properties, and PTFE composite coating is low friction coefficient, high temperature stability and high chemical resistance. To prepare excellent RE-Ni-Fe-P-PTFE composite coating through electrodeposition, some experiments were completed, and the effect of surfactant conc., PTFE conc., and the conc. of rare earth on PTFE content in the coating was studied. The results show that the optimum electrodeposited conditions are that the conc. of rare earth La is 3 g/L, the conc. of PTFE solution is 50 ml/L, temperature is 55 °C, current density is 10 A/dm2. And that the friction coefficient of the coating is decreased significantly, and the lubricating property is improved.

Low friction coefficient nanocomposite CrAlSiN/gradient-CrAlSiCN coatings for high speed/dry machining applications

2021 ◽  
pp. 1-24
Author(s):  
Puneet Chandran ◽  
Krishna Valleti ◽  
Venu Gopal Anne
Keyword(s):  
Friction Coefficient ◽  
Adhesion Strength ◽  
Tool Life ◽  
Tribological Properties ◽  
High Speed ◽  
Nanocomposite Coating ◽  
Dry Machining ◽  
Wear Properties ◽  
Low Friction ◽  
Dlc Coating

Abstract Providing advanced coating solutions for high speed dry machining applications is gaining importance by the day especially with the increasing employment of difficult-to-machine materials in niche areas. Taking into account the recent demands in developing such coatings, in the present study, a novel low friction coefficient nanocomposite coating: CrAlSiN/G-CrAlSiCN (G: Gradient) was developed which can be used in high speed or dry machining applications. Initially, CrAlSiN nanocomposite coating and carbon incorporated CrAlSiN coating were deposited separately using the cylindrical cathodic arc PVD technique. The as deposited films were comprehensively analyzed to determine their adhesion strength, phase composition, sliding wear properties (friction coefficient), hardness and tool life. Preliminary observations revealed that the films did not show evidence of diamond-like carbon (DLC) formation (from Raman analysis). Further, an increase in the carbon content led to a steep decrease in the adhesion strength. This result persuaded a study on developing a novel coating with gradient carbon architecture which would retain the properties of a nanocomposite whilst supporting the nanocomposite under-layer by reducing the coefficient of friction. In comparison to the CrAlSiN nanocomposite coating and a standard DLC coating, the novel gradient carbon coating showed superior tribological properties along with a better tool life. This study marks the first such attempt at studying the influence of carbon incorporation to the CrAlSiN nanocomposite coating on improving the overall mechanical and tribological properties of the coating architecture (CrAlSiN/G-CrAlSiCN) for dry machining applications.

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