The influence of tribochemical reactions of antiwear additives on heterogeneous surface layers in boundary lubrication

Madej, Monika; Ozimina, Dariusz; Piwoński, Ireneusz

doi:10.1007/s11249-006-9075-y

Cited by 11 publications

(8 citation statements)

References 9 publications

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“…Various systems have been developed so far of exceptional in some cases properties. Indicative systems with reinforcing phases, such as Al 2 O 3 [19][20][21][22][23], SiO 2 [24], Cr 2 O 3 [25], ZnO [26], SiC [27][28][29], B 4 C [30], WC [31], CNTs [32,33], Graphite [34], BN [35], Diamond [21,33], Si3N4 [27,36], CeO 2 [37], MoS 2 [38,39], PTFE [40,41], and combinations of them [42,43] are reported.…”

Section: Introductionmentioning

confidence: 99%

Microstructural, Surface Topology and Nanomechanical Characterization of Electrodeposited Ni-P/SiC Nanocomposite Coatings

et al. 2019

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In the present study, nickel phosphorous alloys (Ni-P) and Ni-P/ silicon carbide (SiC) nanocomposite coatings were deposited by electrodeposition on steel substrates in order for their microstructural properties to be assessed while using SEM, XRD, and three-dimensional (3D) profilometry as well as nanoindentation. The amorphisation of the as-plated coatings was observed in all cases, whereas subsequent heat treatment induced crystallization and Ni3P intermetallic phase precipitation. Examination of the surface topology revealed that the surface roughness follows the deposition characteristics and heat treatment induced microstructural changes. Additionally, substantial improvements in mechanical properties, including hardness, yield stress, and elasticity modulus, were obtained for the Ni-P, Ni-P/SiC nanocomposites when heat treated as seen from the nanoindentation results. A Finite Element Analysis (FEA) was developed to simulate the nanoindentation tests that enable the precise extraction of the Ni-P and Ni-P/SiC nanocomposite coatings’ stress-strain behavior. It is shown that the correlation between the nanoindentation tests and the computational models was satisfactory, while the stress-strain curves revealed higher yield points for the heat-treated samples.

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Section: Introductionmentioning

confidence: 99%

Microstructural, Surface Topology and Nanomechanical Characterization of Electrodeposited Ni-P/SiC Nanocomposite Coatings

et al. 2019

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“…Recently, it was also reported that WC/C coatings exhibit excellent behaviour under heavily loaded conditions of sliding and rolling contact (Krantz et al, 2003). Many efforts have been made in recent years to understand the lubrication of coated components (Michalczewski et al, 2009;Vlad et al, 2010;Podgornik et al, 2005;Madej et al, 2006;Kula et al, 1997). Despite many papers concerning this topic, the wear mechanism under scuffing conditions of coated parts is far from a complete explanation.…”

Section: Introductionmentioning

confidence: 99%

The problems of resistance to scuffing of heavily loaded lubricated friction joints with WC/C-coated parts

Michalczewski

Piekoszewski

Tuszyński

et al. 2014

Industrial Lubrication and Tribology

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Purpose -The purpose of this paper was to explore the mechanisms of scuffing propagation of heavily loaded lubricated friction pair elements coated with low-friction WC/C coating for various material combinations. Design/methodology/approach -The investigations were performed for low-friction coatings WC/C (a-C:H:W) deposited by the reactive sputtering physical vapour deposition (PVD) process. Experiments were carried out using a four-ball tester with continuously increasing loads. Tests were conducted for the following four material combinations: steel/steel tribosystem (all balls uncoated); steel/coating tribosystem (one upper ball uncoated/three lower balls WC/C-coated); coating/steel tribosystem (one upper ball WC/C-coated/three lower balls uncoated); and coating/coating tribosystem (all balls WC/C-coated). Findings -The better scuffing resistance is achieved by coating only one element (coating/steel tribosystem) than all elements (coating/coating tribosystem). The description of scuffing propagation for all investigated tribosystems was done. The high scuffing resistance of the coating/steel tribosystem resulted from reducing the adhesion between rubbing surfaces due to low chemical affinity (similarities) between the steel and the coating material and the presence of solid lubricant in the friction zone. Practical implications -In all cases, when a coating is applied, an increase in scuffing resistance is observed. However, it is better to coat only one element than all. Furthermore, the scuffing resistance for the coating/steel tribosystem is significantly higher than for the steel/coating tribosystem. Originality/value -The main value of this paper is description of scuffing propagation and revealing the new aspects in application of low-friction WC/C coating for heavily loaded lubricated friction pair elements. The overlapping ratio has been defined as an important factor influencing the scuffing resistance of the coated tribosystems.

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“…The effectiveness of a lubricant additive is measured by adsorption, hence the frequent application of zinc dialkyldithiophosphate, ZDTP. The addition of this substance causes that the coating resistance to wear, corrosion, and antioxidants is higher [7,8]. The behavior of ZDTP in a friction joint is very complex and depends on numerous factors, for instance, the type and properties of friction surfaces, load, and temperature [9].…”

Section: Introductionmentioning

confidence: 99%

The Wear Resistance of HVOF Sprayed Composite Coatings

2010

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The aim of the study was to determine the interactions between standard antiwear zinc dialkyldithiophosphate (ZDTP)-type additives and composite coatings containing hard phases of Al 2 O 3 , SiC, and TiN in the nickel matrix. The analysis was conducted for selected ceramic materials with different structures and different tribological behavior of ionic, covalent, and metallic bonds. The composite coatings were deposited on C45 steel using the high-velocity oxygen-fuel (HVOF) process. This process efficiently uses high kinetic energy and controlled thermal output to produce dense, low porosity coatings with highly predictable chemistries that are homogeneous in structure. The coatings can operate under harsh service conditions, because they are characterized by higher durability and higher wear and corrosion resistance. It was necessary to determine the interactions between the ZDTP-type antiwear additives (zinc dialkyldithiophosphates) and the coatings. The tribological properties of nickel and nickelbased composite coatings were examined by means of a T-01 M tester functioning in the ball-on-disc configuration during technically dry friction and boundary lubricated friction with lubricants containing 1% ZDTP. The comparative analysis confirmed different tribochemical activity and, accordingly, different tribological effectiveness of the nickel and nickel-based composite coatings during friction.

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The influence of tribochemical reactions of antiwear additives on heterogeneous surface layers in boundary lubrication

Cited by 11 publications

References 9 publications

Microstructural, Surface Topology and Nanomechanical Characterization of Electrodeposited Ni-P/SiC Nanocomposite Coatings

Microstructural, Surface Topology and Nanomechanical Characterization of Electrodeposited Ni-P/SiC Nanocomposite Coatings

The problems of resistance to scuffing of heavily loaded lubricated friction joints with WC/C-coated parts

The Wear Resistance of HVOF Sprayed Composite Coatings

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