The influence of microstructure on tribological properties of WO3 thin films

Greenwood, O. D.; Moulzolf, Scott C.; Blau, Peter J.; Lad, Robert J.

doi:10.1016/s0043-1648(99)00255-0

Cited by 58 publications

(32 citation statements)

References 16 publications

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“…Over the last few years, oxides and their combinations have attracted interest for tribological applications due to their potential as low-friction coatings in the high-temperature range [1][2][3][4][5][6][7][8][9]. In an earlier study [9], we reported on the beneficial effect of vanadium oxide formation on tribological properties of V and VN coatings.…”

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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Section: Introductionmentioning

confidence: 99%

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

2008

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“…Lugscheider et al [4] studied the tribological behaviour of the tungsten oxide with low oxygen content showing their good tribological properties. Greenwood et al [5] studied the influence of the morphology of WO 3 coatings deposited by electron beam evaporation on the sliding properties concluding that the amorphous coatings exhibited higher friction coefficient and wear rate than the epitaxial ones.…”

Section: Introductionmentioning

confidence: 99%

Tungsten oxide with different oxygen contents: Sliding properties

Polcar

Parreira

Cavaleiro

2007

Vacuum

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In this study, tungsten oxide coatings with 13 and 75 at% of oxygen were prepared by DC reactive magnetron sputtering from a pure W target in an Ar+O 2 atmosphere. The coating hardness (H) decreased with increasing oxygen content from 25 to 7.7 GPa. The values of H/E ratio were 0.08 and 0.07 for W 87 O 13 and W 25 O 75 , respectively.The tribological measurements were carried out on a pin-on-disc tribometer at room temperature, with a load of 5 N and steel 100Cr6, ceramic Si 3 N 4 and Al 2 O 3 balls as sliding partners. The wear track and wear debris were visualised by scanning electron microscopy and the chemical composition of the later was estimated by energy-dispersive X-ray analysis. The friction coefficient was rather high in case of the W 87 O 13 coating reaching values in the range from 0.7 to 0.75 for both counterpart materials, and slightly lower for W 25 O 75 ($0.50). The coating wear rate decreased with increasing oxygen content with the Al 2 O 3 ball, while using Si 3 N 4 ball as a counterpart showed an opposite trend. The coating with low oxygen content was more resistant to abrasive wear. r

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“…The biggest concern about WS2 as a lubricant is its high reactivity in humid environments and formation of WO3, which affects tribological performance [23]. The biggest drawback in the performance of GNP as a lubricant is the tendency to increase porosity due to agglomeration, affecting the tribological performance [24].…”

Section: Improving Wear and Coefficient Of Frictionmentioning

confidence: 99%

“…• Needs from a humid environment to provide lubrication [20] • Rapidly degrade in humid conditions [23] • Easy folding and wrinkling [99] • Better tribological performance in vacuum than in humid environments [80] Anti-wear Mechanism…”

Section: Cons For Tribological Applicationsmentioning

confidence: 99%

“…This response of WO3 is due to the dangling bonds of WS2 when reacting with oxygen. It has been proved that the presence of WO3 highly affects the friction coefficient during tribological performance at room temperature [23]. Prasad [95] and coworkers explained that hard particles, randomly distributed in the WS2 substrate, are able to deflect or end crack propagation.…”

Section: Cons For Tribological Applicationsmentioning

confidence: 99%

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The influence of microstructure on tribological properties of WO3 thin films

Cited by 58 publications

References 16 publications

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

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

Tungsten oxide with different oxygen contents: Sliding properties

A Comparison Between Graphene and WS2 as Solid Lubricant Additives to Aluminum for Automobile Applications

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