THE EFFECT OF MeC NANOPARTICLES ON THE MICROMECHANICAL AND TRIBOLOGICAL PROPERTIES OF CARBON COMPOSITE COATINGS

Tribologia ◽  
2018 ◽  
Vol 280 (4) ◽  
pp. 157-163
Author(s):  
Sławomir ZIMOWSKI ◽  
Marcin KOT ◽  
Tomasz MOSKALEWICZ
Keyword(s):  
Wear Resistance ◽  
Amorphous Carbon ◽  
Tribological Properties ◽  
Composite Coatings ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Nanocrystalline Phase ◽  
Strong Adhesion ◽  
Scratch Tests ◽  
The Impact

Nanocomposite carbon coatings composed of a nanocrystalline phase and an amorphous carbon matrix (a-C or a-C:H) are an important group of coatings for tribological applications, especially if low friction is desired. Strong adhesion between the coating and the substrate as well as the ability to carry load are particularly important in ensuring the durability of the system. In this paper, the impact of a reinforcing phase in the form of hard carbides of chromium, titanium and tungsten (MeC) on the micromechanical and tribological properties of MeC/a-C coatings were analysed. The microhardness and modulus of elasticity using the indentation method and adhesion of these coatings to the substrate in scratch tests were determined. On the basis of tribological tests, the friction coefficient and wear rate of the coatings were determined during nonlubricated sliding contact with an alumina ball. The tested nanocomposite coatings showed very good sliding properties and wear resistance. The nc-WC/a-C and nc-TiC/a-C coatings exhibit the smallest coefficient of friction (below 0.1) and the highest wear resistance. The presence of nanocrystalline carbides in the amorphous carbon matrix limits the propagation of cracks in the coatings and allows the higher load carrying capacity.

Characterization and Tribological Properties of Nanostructured Copper/Carbon Composite Films Prepared by Microwave Plasma-Assisted Dual Deposition Processes

2002 ◽  
Vol 750 ◽  
Author(s):  
François Thiery ◽  
Yves Pauleau ◽  
Jacques Pelletier
Keyword(s):  
Amorphous Carbon ◽  
Electron Cyclotron Resonance ◽  
Microwave Plasma ◽  
Plasma Reactor ◽  
Composite Films ◽  
Chemical Vapor ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Carbon Films ◽  
Radius Of Curvature

ABSTRACTNanocrystalline copper/hydrogenated amorphous carbon films have been deposited on Si substrates at the floating potential using a distributed electron cyclotron resonance microwave plasma reactor. In this deposition technique, the microwave plasma-enhanced chemical vapor deposition process of carbon from argon-methane or argon-acetylene mixtures of various compositions was associated with the sputter deposition of copper from a copper target. The total pressure was fixed at 0.13 Pa. For deposition, the substrates mounted on a water-cooled substrate holder were maintained at ambient temperature. The composition of films determined by Rutherford backscattering spectroscopy, energy recoil detection analyses and nuclear reaction analyses was investigated as a function of the gas phase composition. The structure of films was identified by X-ray diffraction (XRD) techniques and the size of copper crystallites incorporated in the amorphous carbon matrix was deduced from XRD data. The magnitude of residual stresses developed in these films was calculated from the radius of curvature of film/substrate samples determined by profilometry. The residual stress values were found to be nearly independent on the composition of films and deposition parameters.

Hot Vacuum Tribological Properties of Chromium Nitride Coatings against Austenitic Stainless Steel Type AISI 316LN and Colmonoy

2011 ◽  
Vol 110-116 ◽  
pp. 600-605 ◽  
Author(s):  
A. Devaraju ◽  
A. Elayaperumal ◽  
S. Venugopal ◽  
Satish V. Kailas ◽  
J. Alphonsa
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Austenitic Stainless Steel ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
High Vacuum ◽  
Steel Type ◽  
Strong Adhesion ◽  
Pin On Disc ◽  
Type Aisi

The tribological properties of Plasma Nitrided (PN) rings were examined in high vacuum environment (1.6 x 10-4bar) at 25°C, 200°C and 400°C. The high vacuum based pin on disc tribometer was used for this investigation. The two different sliders namely austenitic stainless steel type AISI 316LN (316LN) pin and Nickel based alloy coated (Colmonoy) pin have been used. The tribological parameters such as friction coefficient, wear mechanism and wear rate have been evaluated. The PN 316LN rings exhibits excellent wear resistance against 316 LN pin and Colmonoy pin at all temperatures. However, the PN 316LN ring vs Colmonoy pin pair shows better wear resistance than PN 316LN ring vs 316 LN pin pair. Whereas the untreated 316 LN ring vs 316 LN pin pair exhibits the combination strong adhesion and plastic deformation wear mechanism.

Microstructure and tribological properties of sprayed nanostructure Fe-based martensite coating on an aluminum cylinder liner

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Eryong Liu ◽  
Yuan Xue ◽  
Yaping Bai ◽  
Jibin Pu ◽  
Shuangming Du ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Tribological Properties ◽  
Cylinder Liner ◽  
Adhesive Force ◽  
Lubricating Oil ◽  
Strengthening Effect ◽  
Content Type ◽  
Fine Grain ◽  
Strong Adhesion ◽  
Aluminum Cylinder

Purpose The purpose of this paper is to improve the tribological properties of aluminum cylinder liner. Higher martensite contents were closely related to the higher hardness and excellent wear resistance of Fe-based coatings. Furthermore, the grain size of the Fe-based coating was approximately 40 nm, which provides an excellent fine grain strengthening effect. Design/methodology/approach To improve the tribological properties of aluminum cylinder liners, a Fe-based martensite coating was prepared by internal plasma spraying technology, whose microstructure and tribological properties were then investigated. Findings Sprayed Fe-based coating possessed a low contact angle and strong adhesion with lubricating oil. In a simulated engine condition, Fe-based coating exhibited a decreased friction coefficient and increased wear resistance under oil lubrication, which was dominated by a stronger adhesive force with lubricating oil, higher martensite contents on the worn surface, higher hardness and higher H/E value than those of the reference HT 200 and Al-19Si cylinder material. Originality/value Nanostructure Fe-based martensite coating was sprayed on an aluminum cylinder liner, which demonstrated remarkable advantages over the reference cylinder material.

ANALYSIS OF THE TRIBOLOGICAL PROPERTIES OF Cu-aTiO2 COMPOSITE COATINGS APPLIED BY THE COLD SPRAY METHOD

Tribologia ◽  
2020 ◽  
Vol 292 (4) ◽  
pp. 51-57
Author(s):  
Małgorzata Rutkowska-Gorczyca ◽  
Anita Ptak ◽  
Marcin Winnicki
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Tribological Properties ◽  
Composite Coatings ◽  
Submicron Particles ◽  
Copper Coatings ◽  
316L Steel ◽  
Long Time ◽  
Effect Of Copper ◽  
The Impact

The properties of copper have been known and used for a very long time, and research has also been carried out for a long time to expand the applications of this material. One of the methods increasing the bactericidal and bacteriostatic effect of copper is modification by means of the TiO2 phase. The research was conducted in order to determine the impact of modification of copper coatings with TiO2 titanium dioxide on their tribological properties. The paper presents the results of studies on tribological wear of composite coatings applied on steel using the method of low-pressure cold gas spraying (LPCS). The tests of resistance to abrasive wear were carried out in a ball-disc combination in reciprocating motion. The analysis of the resistance to abrasive wear of the tested coatings included the determination of the impact of the pressure force on the intensity of wear and the kinetic friction coefficient of the tested friction pairs. It was found that the samples covered only with copper coatings were characterized by a higher value of friction coefficient in relation to the substrate made of AISI 316l steel. The modification of copper with the submicron particles TiO2 fraction does not increase the value of friction coefficient. The value of this parameter is maintained at a similar level regardless of the applied counterspecimen.

MECHANICAL AND TRIBOLOGICAL ANALYSIS OF MONOLITH AND COATING POLYETHERETHERKETONE

Tribologia ◽  
2019 ◽  
Vol 286 (4) ◽  
pp. 73-86
Author(s):  
Mateusz OTTO ◽  
Sławomir ZIMOWSKI ◽  
Wojciech SIKORA ◽  
Tomasz MOSKALEWICZ
Keyword(s):  
Tribological Properties ◽  
Vickers Hardness ◽  
Research Work ◽  
Scratch Hardness ◽  
The Coefficient Of Friction ◽  
Substrate Properties ◽  
Mar Resistance ◽  
Result Analysis ◽  
Scratch Tests ◽  
The Impact

In this work, a comparative analysis of the micromechanical and tribological properties of polyetheretherketone (PEEK) in bulk and coating form was performed. The PEEK 708 coating was applied on a Ti6Al4V titanium alloy flat specimen using the electrophoretic deposition method. The micromechanical properties were determined through indentation tests performed using the Vickers method and scratch tests. Based on research work, the Vickers hardness (HV), elastic modulus (E), scratch hardness (HS), and Micro Mar Resistance (MMR) were determined. The tribological properties were defined by the coefficient of friction (fs and fw), which was obtained in scratch tests and ball-on-disk tests. The results of this research indicate, despite the slightly higher Vickers hardness (HV) of the PEEK 708 coating (HV=350 MPa, HS=300 MPa) relative to PEEK bulk (HV=300 MPa, HS=210 MPa), that there is an almost 40% difference between the scratch hardness (HS) values of these PEEK forms. It appears from the result analysis in this paper that testing methods to determine the micromechanical and tribological properties of PEEK in monolith form can be used for both PEEK coatings. Under certain test conditions, the impact of the substrate properties on the results of the PEEK 708 coating was not found.

Advances in the Development of Carbidic ADI

2010 ◽  
Vol 457 ◽  
pp. 187-192 ◽  
Author(s):  
Laino Sebastián ◽  
Jorge Antonio Sikora ◽  
Ricardo C. Dommarco
Keyword(s):  
Wear Resistance ◽  
Impact Toughness ◽  
High Stress ◽  
Field Tests ◽  
Stress Conditions ◽  
Wheel Loader ◽  
New Type ◽  
Scratch Tests ◽  
The Impact ◽  
Carbide Content

Carbidic ADI (CADI) is a new type of Austempered Ductile Iron containing free carbides in the microstructure, providing a particular combination of wear resistance and impact toughness. In this work, four CADI variants were evaluated, in which carbides were promoted by alloying with chromium. Tests performed under the low stress abrasion condition imposed by the ASTM G65 standard show that CADI can increase the wear resistance up to 100 % when compared with conventional ADI austempered at the same temperature. The carbide content must be higher than 10 % to promote a considerable reinforcing effect. However, at this carbide content level, the impact toughness varies between 7 and 11 J/cm2 for unnotched samples. These values are much lower than those of conventional ADI, but higher than those of other abrasion resistant materials, like white irons. Some CADI variants were also evaluated in field tests, producing abrasion under either low stress or high stress conditions. For this purpose, two CADI prototype parts were studied: screw segments for animal food extruders (low stress abrasion) and wheel loader bucket edges (high stress abrasion). The results gathered showed that CADI behaves satisfactorily under low stress abrasion, but the performance is not so good under high stress conditions. To analyze the differences in the abrasion response, scratch tests were performed in order to evaluate the interaction between the abrasive tip and the microstructure.

Nanocrystalline diamond/amorphous carbon composite coatings for biomedical applications

2008 ◽  
Vol 17 (4-5) ◽  
pp. 882-887 ◽  
Author(s):  
C. Popov ◽  
S. Bliznakov ◽  
S. Boycheva ◽  
N. Milinovik ◽  
M.D. Apostolova ◽  
...  
Keyword(s):  
Amorphous Carbon ◽  
Biomedical Applications ◽  
Composite Coatings ◽  
Carbon Composite ◽  
Nanocrystalline Diamond

Structure and tribological properties of super-hardened strengthening coatings based on boron carbide

2020 ◽  
pp. 134-140
Author(s):  
Aleksey G. Ipatov ◽  
Evgeniy V. Kharanzhevskiy ◽  
Sergey N. Shmykov
Keyword(s):  
Wear Resistance ◽  
Boron Carbide ◽  
Fusion Zone ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Mechanical Engineering ◽  
Ceramic Coatings ◽  
Research Purpose ◽  
Powder Materials ◽  
The Impact

The use of standard alloys, in particular steels, to increase the wear resistance of contact surfaces in mechanical engineering in most cases has lost its relevance due to low mechanical and tribological properties. Currently, in mechanical engineering, as well as in repair production, technologies for obtaining functional and restorative coatings that differ significantly from the properties of the product material are widely implemented. (Research purpose) The research purpose is in studying the physical and tribological properties of ceramic coatings obtained by laser melting of fine powder materials. (Materials and methods) Authors used a powder mixture based on boron carbide and nitride as the initial powder materials as the most solid, heat-resistant and chemically inert compounds, additionally doped with magnesium oxide and lithium. Authors used an ytterbium fiber laser with a maximum power of 50 watts as a laser radiation generator. (Results and discussion) It was found that laboratory studies confirm the high adhesion of the ceramic coating with a steel substrate. It also was found that stable chemical compounds based on iron carbides and borides are formed in the fusion zone. The article notes that the high impact strength of the coating was confirmed by the shock tests of samples-in the impact (destruction) zone, there is no formation of significant cracks and chips of the coating, the fusion zone without traces of separation and destruction. The article shows that the lowest coefficient of friction at elevated temperature and dynamic loads is observed in coatings with the presence of metal oxides, this is explained by the accelerated formation of a tribofilm based on boric acid. (Conclusions) The presented results have a high scientific basis and practical potential. The low coefficient of friction and high wear resistance allow to use the results of research in tribo-couplings that are operated under high temperatures and kinematic characteristics.

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