Tribological properties of silver- and copper-doped transition metal oxide coatings

Gulbiński, W.; Suszko, T.; Sienicki, W.; Warcholiński, B.

doi:10.1016/s0043-1648(02)00292-2

Cited by 131 publications

(59 citation statements)

References 17 publications

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“…Dry sliding tests showed that the friction coefficient of such a composite coating dropped from 0.6-0.8 to about 0.18 at 700 o C. It was concluded that the addition of vanadium to hard coatings holds promise for achieving greater lubricity during dry machining mainly because of the formation of V 2 O 5 and other easily shearable lower-oxides of vanadium [28]. Gulbinski et al [29] studied the dry sliding behavior of pure MoO 3 , V 2 O 5 as well as phases originating from Ag 2 O-MoO 3 , Cu-V 2 O 5 and Ag-V 2 O 5 . All of the phases produced were able to lower friction, but the best results were observed on silver molybdate (Ag 2 MoO 4 ) and silver-vanadium oxides forming surfaces.…”

Section: Double Oxidesmentioning

confidence: 99%

Relation of Certain Quantum Chemical Parameters to Lubrication Behavior of Solid Oxides

Erdemir

Jin

2005

IJMS

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Abstract:It is well-documented that certain oxides (such as Re 2 O 7 , B 2 O 3, MoO 3 , V 2 O 5 , etc.) can provide friction coefficients of 0.1-0.3 to sliding surfaces at elevated temperatures and thus they are often referred to as lubricious oxides in the tribology literature. In a recently proposed crystal chemical model, Erdemir was able to establish a close correlation between the reported friction coefficients of such oxides and their ionic potentials [1]. In the present paper, we expand on this original concept and explore the relevance of two other quantum chemical parameters, electronegativity and chemical hardness, to the lubricity of solid oxides. These parameters have already been used by scientists to explain the nature of tribochemical interactions between various oil additives and sliding surfaces. It is conceivable that electronegativity and chemical hardness may also be strongly related to the extent of adhesive interactions and shear rheology of solid oxides and hence to their lubricity. The new results have confirmed that electronegativity, like ionic potential, is indeed a valid quantum chemistry parameter that can be used in predicting the lubrication behavior of solid oxides. Generally, the higher the electronegativity of the solid oxides is, the lower the friction coefficients will be. However, chemical hardness did not yield a similar trend. In light of these new findings, we propose some guidelines for the formulation of novel oxide or alloy systems that can lead to the formation of lubricious oxides at elevated temperatures. The findings of this study may pave the way for designer-based tribosystems in general and smart tribochemical systems in particular in future tribological applications such as dry machining.

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Section: Double Oxidesmentioning

confidence: 99%

Relation of Certain Quantum Chemical Parameters to Lubrication Behavior of Solid Oxides

Erdemir

Jin

2005

IJMS

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“…The wear rate from RT to 700 • C is reduced by an order of magnitude, and the worn surface is covered by a continuous and smooth film at 700 • C. As temperature increases to 500 • C, MoS 2 is oxidized and becomes molybdenum oxide. Ag and Mo oxide generates silver molybdate, first proposed by Gulbinski [18], good high-temperature lubrication with a layered structure, which may be considered a mixture of AgO and MoO 3 layers separated by a silver layer. In fact, the lubrication mechanism of silver molybdate can be attributed to weaker Ag-O bridging bonds that are more easily broken to form a rich silver lubrication film when subjected to sliding, which is responsible for the low friction at the sliding interface [9].…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Behavior of an Ag–Mo Co-Implanted GH4169 Alloy via Ion-Beam-Assisted Bombardment

et al. 2017

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Ag, Mo, and Ag-Mo were respectively implanted into GH4169 alloy substrates without heating via ion-beam-assisted bombardment technology (IBAB). In addition, the wear performance under low sliding speed and applied load were researched at room temperature (RT). A small amount silver molybdate phase could be detected on the surface of the co-implanted GH4169 alloy bombarded by a high-energy ion beam. The average friction coefficients under the steady wear state had almost no change at all. Compared with the un-implanted GH4169 alloys, the wear rate of the GH4169 alloys with co-implantation of Ag and Mo was reduced by 75%. A large amount of the silver molybdate phase could be generated due to the tribo-reaction on the worn surface during sliding. It benefits the formation of continuous oxide layers as lubrication and protected layers, leading to the change in the predominant wear mechanism from abrasion and adhesion wear to oxidation wear.

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“…In the literature, several investigations on structural and optical properties of V 2 O 5 films prepared by various deposition techniques and under varying deposition conditions can be found [10][11][12][13][14][15][16][17][18]. However, with the exception of a few investigations [5,19], the tribological properties of V 2 O 5 films, particularly at elevated temperatures, have not yet been reported in detail. Therefore, the purpose of the present study was to prepare VN-V 2 O 5 bi-layer coatings by dc and bipolar-pulsed dc reactive magnetron sputtering with V 2 O 5 top-layers having a sufficient thickness and to study their tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Reactive Magnetron Sputtered V2O5 and VN–V2O5 Coatings

2008

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Next generation of advanced hard coatings for tribological applications should combine the advantages of hard wear resistant coatings with low-friction films. In this study, the tribological behaviour of vanadium pentoxide (V 2 O 5 ) single-layer as well as VN-V 2 O 5 bi-layer coatings was investigated in the temperature ranging between 25 and 600°C. For VN-V 2 O 5 bi-layer coatings, the V 2 O 5 toplayers were deposited by dc and bipolar-pulsed dc reactive magnetron sputtering, where the V 2 O 5 phase shows preferred growth orientation in (200) and (110), respectively. The V 2 O 5 single-layer coatings were prepared by dc reactive magnetron sputtering with a substrate bias of -80 V which leads to a preferred (200) growth orientation. Tribological properties were evaluated using a ball-on-disc configuration in ambient air with alumina balls as counterpart. The structure of the as-deposited films and eventual changes after tribometer testing were identified using X-ray diffraction, Raman spectroscopy and scanning electron microscopy. The friction coefficient of VN-V 2 O 5 bi-layer coatings deposited in dc and pulsed dc mode decreases from room temperature to 600°C, where the pulsed dc VN-V 2 O 5 coatings have a significantly lower coefficient of friction over the whole testing temperatures reaching a value of 0.28 at 600°C. Up to 400°C, V 2 O 5 single-layer coatings showed almost the same coefficient of friction as pulsed dc VN-V 2 O 5 bi-layer coatings but reached a value of 0.15 at 600°C. It seems that thermal activation of crystallographic slip systems is necessary for V 2 O 5 films to show a low-friction effect.

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Tribological properties of silver- and copper-doped transition metal oxide coatings

Cited by 131 publications

References 17 publications

Relation of Certain Quantum Chemical Parameters to Lubrication Behavior of Solid Oxides

Relation of Certain Quantum Chemical Parameters to Lubrication Behavior of Solid Oxides

Friction and Wear Behavior of an Ag–Mo Co-Implanted GH4169 Alloy via Ion-Beam-Assisted Bombardment

Tribological Properties of Reactive Magnetron Sputtered V2O5 and VN–V2O5 Coatings

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