Influence of oxide phase formation on the tribological behaviour of Ti–Al–V–N coatings

Kutschej, K.; Mayrhofer, P.H.; Kathrein, M.; Polcik, P.; Mitterer, Christian

doi:10.1016/j.surfcoat.2005.08.044

Cited by 111 publications

(46 citation statements)

References 23 publications

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“…High friction coefficients of the coatings may be linked with high coating hardness, which was reported to cause higher friction force. [55,56] The values measured in the present work are in reasonable agreement with those reported in the literature [57][58][59] and are consistent with the adhesive mode of wear. The high friction coefficient value and the low wear volume of these coatings at 1023 K (750°C) may be accounted for by the Al-rich oxide layer inside the track.…”

Section: Resultssupporting

confidence: 92%

High-Temperature Sliding Wear Testing of Cathodic Arc Physical Vapor Deposition AlTiN- and AlTiON-Coated Hot Work Tool Steels

Birol

İsler

Ürgen

2010

Metall Mater Trans A

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Thin hard coatings provide the much needed protection for steel thixoforming tools that must resist wear at high temperatures. The wear resistance of AlTiN-and AlTiON-coated hot work tool steel was investigated at 1023 K (750°C), measured to be the cavity surface temperature shortly after the steel slurry was forced into the thixoforming die. The wear tests were repeated in exactly the same fashion with uncoated tool steel samples to identify the impact of AlTiN and AlTiON coatings on the high-temperature wear performance of X32CrMoV33 tool steel. The nature, the thickness, and the adherence of the oxide scales impact the tribological behavior. The poor adherence and limited ductility of ferrous oxides promote the failure of the oxide scale impairing the resistance to wear of the hot work tool steel at elevated temperatures. The substantial softening in the X32CrMoV33 hot work tool steel is also critical in the wear volume loss it suffers. AlTiN and AlTiON coatings, on the other hand, form a stable and protective oxide surface layer at high temperatures and therefore provide an enhanced resistance to oxidation. The latter is relatively more resistant to oxidation and is thus the better of the two coatings tested in the present work.

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Section: Resultssupporting

confidence: 92%

High-Temperature Sliding Wear Testing of Cathodic Arc Physical Vapor Deposition AlTiN- and AlTiON-Coated Hot Work Tool Steels

Birol

İsler

Ürgen

2010

Metall Mater Trans A

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“…Some of them, in particular V 2 O 5 , show low shear strength in the solid state as well as low melting temperatures, thus providing lubrication by solid and/or liquid oxide phases. [13,14] However, these oxides are only formed under certain environmental conditions (high temperatures and oxygen-containing atmosphere). Apart from metal oxide lubricants, soft noble metal phases (Ag, Au) have been reported as promising candidates for lubrication over a wide temperature range (e.g.…”

mentioning

confidence: 99%

High‐Temperature Tribological Behavior of CrN‐Ag Self‐lubricating Coatings

Kutschej

Mitterer

Mulligan³

et al. 2006

Adv Eng Mater

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Transition metal nitride hard coatings like CrN or TiN are widely used in several applications due to their excellent wear, corrosion and oxidation resistance. However, the friction coefficient of most transition metal nitride coatings is fairly high (0.6-0.8) and the tribological effectiveness, especially at elevated temperatures, is insufficient. [1,2] Therefore, a lot of effort has been made in recent years to decrease the friction coefficient at room as well as at elevated temperatures. [3][4][5] Adding layered solid lubricants like DLC, MoS 2 or WS 2 to hard coatings by forming nanocomposite structures has been established as a suitable approach to reduce friction. [6][7][8][9] Nevertheless, these lubricating phases fail due to degradation and oxidation at temperatures > 350°C. [5] The incorporation of V as a high temperature lubricant into transition metal nitride coatings forming a solid solution (Ti-Al-V-N) [10] or superlattice structures of hard and lubricating layers (TiAlN/ VN, TiAlN/TiAlVN) [11,12] led to a significant enhancement of the tribological performance in high-temperature applications. At temperatures between 500 and 700°C, so-called Magneli phase oxides (V-O) are formed on the coating surface. Some of them, in particular V 2 O 5 , show low shear strength in the solid state as well as low melting temperatures, thus providing lubrication by solid and/or liquid oxide phases. [13,14] However, these oxides are only formed under certain environmental conditions (high temperatures and oxygen-containing atmosphere). Apart from metal oxide lubricants, soft noble metal phases (Ag, Au) have been reported as promising candidates for lubrication over a wide temperature range (e.g. synthesized as nanocomposites TiC/Ag, [15] yttrium-stabilized zirconia YSZ/Au, [16,17] CrN/Ag [18] ). The benefit of these nanocomposite systems is that noble metals may act as lubricants at room temperature (RT) as well as high temperatures due to their low shear strength and stable thermochemistry. Due to their low sensitivity to the environment, such coatings are applicable in ambient air as well as under vacuum conditions in a wide temperature range.We have recently shown that the incorporation of Ag as a solid lubricant in hard wear-resistant CrN coatings decreases friction and wear at RT. [18] In addition, we found that vacuum annealing at 600°C leads to the formation of Ag agglomerates on the coating surface. In this study, special emphasis is laid on the influence of surface reactions, like the formation of these agglomerates and/or surface oxidation, on the hightemperature tribological behavior at 600°C. Characterization of the friction curves and the wear tracks provides an understanding of the relation between the out-diffusion of Ag (forming agglomerates) and its lubricating effect. ExperimentalThe substrates were ground and polished 304 stainless steel samples that were cleaned in ultrasonic baths of trichloroethane, acetone, methanol, and deionized water, respectively and blown dry with N 2 . The ∼ 3 lm thick coa...

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“…V 2 O 5 , Ag 2 Mo 2 O 7 ) [6][7][8][9]. Among these elements, particular attention has been given to the vanadium-containing coatings (Magnéli phases V n O 2n−1 ), which showed interesting tribological properties in the temperature range 500-700•C [2,[10][11][12][13][14][15]. Dissimilar series of V-based hard coatings have been developed, such as ternary…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…CrVN [16], (V,Ti)N [17], multilayer AlN/VN [18] and quaternary single layered or multilayered AlCrVN [19,20] and TiAlVN [12,[21][22][23]. Independently of the configuration, the friction was decreased and the wear resistance improved; however, the oxidation resistance was degraded.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Independently of the configuration, the friction was decreased and the wear resistance improved; however, the oxidation resistance was degraded. For example, for ternary AlCrN and TiAlN coatings the onset point of oxidation decreased to 600 ºC with V incorporation [12,24,25]. oxides were observed for an annealing temperature of 700 ºC [25].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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