Investigation on the oxidation behavior of AlCrVxN thin films by means of synchrotron radiation and influence on the high temperature friction

Tillmann, Wolfgang; Kokalj, David; Stangier, Dominic; Paulus, Michael; Sternemann, Christian; Tolan, Metin

doi:10.1016/j.apsusc.2017.09.029

Cited by 24 publications

(8 citation statements)

References 47 publications

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“…However, it can be concluded that the oxidation state of the V component, as detected on the surface of the Fe-V coating, increases with increasing temperature. Similar findings were observed studying the oxidation behavior of AlCrV x N thin films at various temperatures [24]. With respect to the tribological investigations (Figure 1), it is found that the COF initially drops gradually until a temperature of 450 • C, which then decreases significantly with increasing temperature starting from 550 • C. Since the oxidation state of the V component increases above 450 • C, it is believed that the oxidation state of the V component in the reactive layer has a fundamental impact on the resulting friction behavior (i.e., the alumina counterbody has a high chemical inertness).…”

Section: Xanes Spectroscopysupporting

confidence: 86%

“…Concerning the tribological characteristics, the aforementioned studies revealed that the reduce in friction was attributed to certain types of V-oxides. As recently discussed [24], the temperature-induced formation of V-oxides depends, inter alia, on the V content and chemical composition of the coating system. Due to its low decohesion energy [5], vanadium pentoxide represents a promising candidate for solid lubricants at elevated temperatures.…”

Section: Introductionmentioning

confidence: 75%

“…With respect to the tribological investigations (Figure 1), it is found that the COF initially drops gradually until a temperature of 450 • C, which then decreases significantly with increasing temperature starting from 550 • C. Since the oxidation state of the V component increases above 450 • C, it is believed that the oxidation state of the V component in the reactive layer has a fundamental impact on the resulting friction behavior (i.e., the alumina counterbody has a high chemical inertness). Quoting the discussion on various studies on V-containing hard coatings, the authors recently clarified in [24] that the reduction of the COF is attributed, among others, to the formation of certain Magnéli phases. Despite a ferrovanadium alloy as feedstock, the oxidation of vanadium is fostered at elevated temperature, leading to a possible formation of self-lubricous vanadium oxides which causes the reduction of the COF.…”

Section: Xanes Spectroscopymentioning

confidence: 99%

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Temperature-Induced Formation of Lubricous Oxides in Vanadium Containing Iron-Based Arc Sprayed Coatings

et al. 2018

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In the field of surface engineering, the use of self-lubricous coatings with the incorporation of vanadium represent a promising approach to reduce friction, thus contributing to the wear behavior. For vanadium containing hard coatings produced by means of thin film technology, the reduction in friction at elevated temperatures was repeatedly attributed to temperature-induced and tribo-oxidatively formed oxides which act as solid lubricant. Only very few studies focused on the tribological characteristics of vanadium containing arc sprayed coatings. In this study, the tribological characteristics of a vanadium containing iron-based arc sprayed deposit were investigated in dry sliding experiments under ambient conditions and different temperatures. Types of wear at the worn surfaces and counterparts were examined by means of electron microscopy and energy dispersive X-ray (EDX) spectroscopy. The speciation of vanadium in the superficial layer was determined using X-ray absorption near edge structure (XANES) spectroscopy. It was found that the vanadium-containing coating exhibited a distinctly reduction of the coefficient of friction above 450 °C which further decreased with increasing temperature. XANES spectroscopy indicated an increased oxidation state for the V component on the coating surface, suggesting the prevalence of specific vanadium oxides which promote a self-lubricating ability of the coating.

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Section: Xanes Spectroscopysupporting

confidence: 86%

Section: Introductionmentioning

confidence: 75%

Section: Xanes Spectroscopymentioning

confidence: 99%

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Temperature-Induced Formation of Lubricous Oxides in Vanadium Containing Iron-Based Arc Sprayed Coatings

et al. 2018

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“…Firstly, w-Al(Cr)N precipitates are formed at the grain boundaries (GBs), followed by the formation of h-Cr(Al)N 0.5 -phase as a consequence of nitrogen loss with a subsequent two-step decomposition of CrN into Cr 2 N and Cr 5–8 . The determination of the onset temperature of the phase decomposition ( T o,d ) over a wide Al composition range, as well as its correlation to the film microstructure and intrinsic stress, is crucial because the formation of the stable w-Al(Cr)N phase results in a reduction of hardness, wear and oxidation resistance 9–13 . In the case of AlCrN-based thin films, however, the complex interplay between temperature-dependent characteristics and properties such as the onset of phase transformation, coefficients of thermal expansion (CTEs), gradients of residual stresses, defect density, hardness, toughness and elastic modulus in different atmospheres is however not yet fully understood 5,6,8,14–16 .…”

Section: Introductionmentioning

confidence: 99%

Stress-controlled decomposition routes in cubic AlCrN films assessed by in-situ high-temperature high-energy grazing incidence transmission X-ray diffraction

Meindlhumer

Klima

Jäger

et al. 2019

Sci Rep

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The dependence of decomposition routes on intrinsic microstructure and stress in nanocrystalline transition metal nitrides is not yet fully understood. In this contribution, three Al0.7Cr0.3N thin films with residual stress magnitudes of −3510, −4660 and −5930 MPa in the as-deposited state were in-situ characterized in the range of 25–1100 °C using in-situ synchrotron high-temperature high-energy grazing-incidence-transmission X-ray diffraction and temperature evolutions of phases, coefficients of thermal expansion, structural defects, texture as well as residual, thermal and intrinsic stresses were evaluated. The multi-parameter experimental data indicate a complex intrinsic stress and phase changes governed by a microstructure recovery and phase transformations taking place above the deposition temperature. Though the decomposition temperatures of metastable cubic Al0.7Cr0.3N phase in the range of 698–914 °C are inversely proportional to the magnitudes of deposition temperatures, the decomposition process itself starts at the same stress level of ~−4300 MPa in all three films. This phenomenon indicates that the particular compressive stress level functions as an energy threshold at which the diffusion driven formation of hexagonal Al(Cr)N phase is initiated, provided sufficient temperature is applied. In summary, the unique synchrotron experimental setup indicated that residual stresses play a decisive role in the decomposition routes of nanocrystalline transition metal nitrides.

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“…Additionally, they are also likely to be promising candidates to solve the challenge of high-temperature friction reduction owing to their chemical stability in air. Many literature reports show that some chromates, molybdates, tungstates, and vanadates have attracted much attention and been applied as high temperature solid lubricants via direct preparation methods or tribochemical reaction over the course of friction at elevated temperatures [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. All these double metal oxides provide fantastic lubrication performances at elevated temperatures, and give a guide as to the usage of them to explore boundary lubrication.…”

Section: Introductionmentioning

confidence: 99%

Role of Magnesium Perrhenate in an Oil/Solid Mixed System for Tribological Application at Various Temperatures

Wang

Yan

et al. 2018

Materials

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Magnesium perrhenate used as a lubricating additive was prepared by an aqueous solution method in this paper, and was suspended in a base oil poly alpha olefin (PAO6) with the aid of surface active agents (SA). The thermal stability of the mixed oil with/without magnesium perrhenate and surface active agents was investigated by thermogravimetry testing. The influences of magnesium perrhenate as solid lubricating additive on the extreme pressure performance and the friction-reducing properties over a wide temperature range of the mixed lubricants were determined by four-ball tests and ball-on-disc frictional tests for the commercially available silicon nitride ball and a Ni-base superalloy frictional pair. The results revealed that the added magnesium perrhenate did not obviously affect the thermostability and oxidation resistance of the base oil. Meanwhile, it minimized the coefficients of friction and wear scar diameter to a certain extent in the four-ball experimental conditions. Ball-on-disc rubbing tests suggested the mixed oil had a similar lubricating performance to the base oil below the decomposition temperature point. The most significant advancement was the impressive antifriction improvement at the high temperature range, while the friction coefficients of the oil containing magnesium perrhenate compound were obviously below that of the base stock. This better tribological performance of the mixed lubricant was attributed to the native shear susceptible property and chemical stability of magnesium perrhenate under high temperature conditions, which could form an effective durable and stable antifriction layer with the oxides from the superalloy matrix, thereby decreasing the friction in the high-temperature environment.

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Investigation on the oxidation behavior of AlCrVxN thin films by means of synchrotron radiation and influence on the high temperature friction

Cited by 24 publications

References 47 publications

Temperature-Induced Formation of Lubricous Oxides in Vanadium Containing Iron-Based Arc Sprayed Coatings

Temperature-Induced Formation of Lubricous Oxides in Vanadium Containing Iron-Based Arc Sprayed Coatings

Stress-controlled decomposition routes in cubic AlCrN films assessed by in-situ high-temperature high-energy grazing incidence transmission X-ray diffraction

Role of Magnesium Perrhenate in an Oil/Solid Mixed System for Tribological Application at Various Temperatures

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