Electrodeposition and Tribological Properties of Self-Lubricating Sn-Ni-PTFE Composite Coating

2013 ◽  
Vol 572 ◽  
pp. 277-280 ◽  
Author(s):  
Li Xia Ying ◽  
Jun Tao Yang ◽  
Ying Liu ◽  
Zhi Kun Yang ◽  
Gui Xiang Wang
Keyword(s):  
Composite Coating ◽  
Tribological Properties ◽  
Metal Surfaces ◽  
Smooth Surface ◽  
Composite Coatings ◽  
Tribological Performance ◽  
The Self ◽  
Extreme Conditions ◽  
Ptfe Composite ◽  
Fine Microstructure

In order to improve the self-lubricating and anti-wear performances of metal surfaces in the extreme conditions, Sn-Ni-PTFE composite coating was electrodeposited on metal surfaces from the electrolyte containing PTFE emulsion. Microstructure, microhardness and tribological properties of the Sn-NiPTFE composite coatings were investigated. Results show that Sn-Ni-PTFE composite coating has smooth surface and fine microstructure. PTFE particles disperse uniformly in the composite coatings. Simultaneously, the incorporation of PTFE particles significantly improves the tribological performance of Sn-Ni coatings. SnNiPTFE composite coatings exhibits lower friction coefficient and better wear resistance in contrast with Sn-Ni coating.

Tribological performance of AlCrN–MoS2/PTFE hard-lubricant composite coatings

2019 ◽  
Vol 234 (9) ◽  
pp. 1355-1367
Author(s):  
Yang Lu ◽  
Jianxin Deng ◽  
Wenlong Song ◽  
Xuemu Li ◽  
Liangliang Zhang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Molybdenum Disulfide ◽  
Tribological Properties ◽  
Adhesive Strength ◽  
Wear Track ◽  
Composite Coatings ◽  
Thermal Spraying ◽  
Tribological Performance ◽  
Ptfe Composite ◽  
Spraying Method

In order to improve the tribological performance of the physical vapor-deposited AlCrN coatings, molybdenum disulfide (MoS2)/poly tetra fluoroethylene (PTFE) coatings were fabricated on the AlCrN coatings surface through the thermal spraying method. The microstructure, adhesive strength, hardness, and tribological properties were investigated. Reciprocating sliding tests against SiC ball were executed with a ball-on-plate tribometer. Results showed that the adhesive strength between the AlCrN–MoS2/PTFE composite coatings and substrate was increased by about 15% compared with single AlCrN coatings. Compared with the single MoS2/PTFE coatings, the hardness of the AlCrN–MoS2/PTFE composite coatings surface was increased by about 15%. The MoS2/PTFE layer can availably reduce the friction coefficient of single AlCrN layer, and the AlCrN–MoS2/PTFE composite coatings exhibited the lowest and the most stable friction coefficient. In addition, the MoS2/PTFE layer existed on the wear track and accumulated on both the sides, which was the main reason that the friction coefficient was still lower compared with the samples without MoS2/PTFE coatings.

Preparation and tribological properties of MoS2/graphite composite coatings modified by La2O3

2018 ◽  
Vol 70 (8) ◽  
pp. 1422-1430
Author(s):  
Ming Qiu ◽  
Rui Zhang ◽  
Yingchun Li ◽  
Hui Du ◽  
Xiao Xu Pang
Keyword(s):  
Service Life ◽  
Abrasive Wear ◽  
Composite Coating ◽  
Tribological Properties ◽  
Wear Mechanisms ◽  
Adhesive Wear ◽  
Composite Coatings ◽  
The Self ◽  
Graphite Composite ◽  
Content Type

PurposeThe MoS2/graphite composite coatings modified by La2O3through spraying technique were successfully prepared on the inner rings of spherical plain bearings. As a comparison, unmodified coatings were also prepared. This paper aims to study the La-modified MoS2/graphite composite coating experimentally and improve the tribological performance of self-lubricating spherical plain bearings.Design/methodology/approachThe performance of La2O3toward the friction coefficient, temperature rise and wear rate of the coatings was studied by a self-made tribo-tester under different swing cycles. And the texture, surface morphology and element composition of the coatings were characterized by scanning electron microscope, energy dispersive spectroscopy and X-ray diffractometry.FindingsThe additives La2O3refined the coatings’ microstructure and improved the tribological properties of the coatings. The oxidation of Mo + 4 to Mo + 6 was effectively inhibited. And the amount of abrasive grains, peeling pits and local cracks on the coatings surface decreased and homogeneous lubricating films formed, which were attributed to the existence of La2O3. The wear mechanisms of unmodified coatings were severe abrasive wear, adhesive wear and delamination wear. However, it exhibited superior wear resistance of the La-modified coatings to unmodified coatings, presenting slight abrasive wear and adhesive wear. The service life of bearings was prolonged under the protection of the modified coatings.Originality/valueThe paper proposed a new modified MoS2/Graphite composite coating for the self-lubricating spherical plain bearings. The investigation on the friction, wear and temperature increase behaviors and the wear mechanisms of the coatings are beneficial to prolonging the service life of the self-lubricating spherical plain bearings.

scholarly journals Self-Lubricating PEO–PTFE Composite Coating on Titanium

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 170 ◽  
Author(s):  
Limei Ren ◽  
Tengchao Wang ◽  
Zhaoxiang Chen ◽  
Yunyu Li ◽  
Lihe Qian
Keyword(s):  
Composite Coating ◽  
Tribological Properties ◽  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Pure Titanium ◽  
Tio2 Coating ◽  
Commercially Pure Titanium ◽  
Ptfe Composite ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

A self-lubricating plasma electrolytic oxidation–polytetrafluoroethylene (PEO–PTFE) composite coating was successfully fabricated on the surface of commercially pure titanium by a multiple-step method of plasma electrolytic oxidation, dipping and sintering treatment. The microstructure and tribological properties of the PEO–PTFE composite coating were investigated and compared with the PEO TiO2 coating and the PTFE coating on titanium. Results show that most of the micro-pores of the PEO TiO2 coating were filled by PTFE and the surface roughness of PEO–PTFE composite coating was lower than that of the PEO TiO2 coating. Furthermore, the PEO–PTFE composite coating shows excellent tribological properties with low friction coefficient and low wear rate. This study provides an insight for guiding the design of self-lubricating and wear-resistant PEO composite coatings.

Tribological Performance of Polymer Composite Coatings Modified With La2O3 and MoS2 Nanoparticles

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Dongya Zhang ◽  
Zhongwei Li ◽  
Feng Gao ◽  
Xian Wei ◽  
Yuquan Ni
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Composite Coating ◽  
Polymer Composite ◽  
Polyvinylidene Fluoride ◽  
Composite Coatings ◽  
Tribological Performance ◽  
Pin On Disc ◽  
Mos2 Nanoparticles ◽  
Babbitt Alloy

Abstract In this study, composite coatings of polyvinylidene fluoride (PVDF) and epoxy resin deposited with La2O3 and MoS2 nanoparticles on the surface of a Babbitt alloy have been studied in order to improve its tribological performance. A pin-on-disc tribometer was used to evaluate the tribological properties of the Babbitt alloys with and without the composite coatings. The results showed that compared with the polymer-La2O3 composite coating, the polymer-MoS2 composite coating was more effective in reducing the friction coefficient and the wear rate of the Babbitt substrate under both dry and boundary lubrication conditions compared with the polymer-La2O3 composite coating. However, the wear rate of the Babbitt alloy with the polymer-La2O3 composite coating was lower than that of the alloy with the polymer-MoS2 composite coating. The wear scratches were analyzed using a scanning electron microscope (SEM). The worn surface of the polymer-La2O3 coating was much smoother and more continuous than that of the polymer-MoS2 coating, meanwhile transfer films were respectively detected on the pin surfaces. The addition of nanoparticles can reduce the wear rate and friction coefficient of polymer composite coating by forming a transfer film. Hence, the polymer composite coating can protect the Babbitt substrate.

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.

Tribological properties of superamphiphobic PPS/PTFE composite coating in the oilfield produced water

Wear ◽  
2014 ◽  
Vol 319 (1-2) ◽  
pp. 62-68 ◽  
Author(s):  
Huaiyuan Wang ◽  
Lei Yan ◽  
Dong Gao ◽  
Dujuan Liu ◽  
Chao Wang ◽  
...  
Keyword(s):  
Composite Coating ◽  
Tribological Properties ◽  
Produced Water ◽  
Ptfe Composite ◽  
Oilfield Produced Water

Fabrication of enamel-mimicking mineralization composite coating induced by electrolytic deposition (ELD) system

2007 ◽  
Vol 1008 ◽  
Author(s):  
Yuwei Fan ◽  
Rizhi Wang ◽  
Janet Moradian-Oldak
Keyword(s):  
Calcium Phosphate ◽  
Composite Coating ◽  
Self Assembly ◽  
Tooth Enamel ◽  
Composite Coatings ◽  
The Self ◽  
Electrolytic Deposition ◽  
Phosphate Solution ◽  
Scanning Electron Micrographs ◽  
Nano Composite

AbstractMature tooth enamel does not remodel nor self-repairs after damage. Therefore, in vitro formation of a uniquely ordered composite similar to enamel is of particular interest. In this study we applied a newly developed electrolytic deposition (ELD) system to promote the amelogenin nano-chain self-assembly and simultaneous calcium phosphate crystallization. Composite coatings of amelogenin-calcium phosphate were prepared on a cathode substrate (Si wafer), from an initial pH of 4-5, and calcium and phosphorus containing solution at room temperature. The effects of a recombinant full-length amelogenin (rP172) and truncated protein without the C-terminal (rP148) on the growth and morphology of the calcium phosphate nano-composite were investigated. A potentiostat was used to control the electrochemical parameters.Following the application of electric current, the local pH around the cathode was increased and resulted in the self-assembly of amelogenin that occurred simultaneously with calcium phosphate mineralization. Transmission and scanning electron micrographs of assembled rp172 amelogenin collected from the 25mM sodium phosphate solution during electrodeposition showed uniform nanospheres and nano-chains structures, while the rP148 formed irregular aggregates. SEM observation of the surface of the nano-composite after electrodeposition, revealed organized nano-rod structures in the presence of rP172, while only nano-sized spherical aggregates were seen in the presence of rP148. ATR-IR confirmed that the mineral phases were mainly octacalcium phosphate, but apatite and amorphous calcium phosphate were also present. Nanoindentation was tested on rP172 and rP148 composite coating. The rP172 composite coating exhibited higher elastic modulus and hardness than rP148 composite. The fracture toughness of rP172 composite was comparable to mature enamel. We therefore conclude that the 24 amino acid hydrophilic C-terminal of amelogenin is essential for the self-assembly, and therefore, for calcium phosphate crystal organization. The new electro-deposition system is effective for fabrication of amelogenin/apatite composites with defined organized structures.

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.

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