TEM-EELS study of low-friction superlattice TiAlN/VN coating: the wear mechanisms

Luo, Quanshun; Zhou, Zhaoxia; Rainforth, W. M.; Hovsepian, P.Eh.

doi:10.1007/s11249-006-9160-2

Cited by 32 publications

(42 citation statements)

References 36 publications

(84 reference statements)

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“…see Ref. [19]). For all of the tribofilm, the roll-like wear debris and the loose wear debris, N K, Ti L2,3, V L2,3 and O K-edges are all present, suggesting a form of (TiAlV)NxOy (Al is not included in a spectrum here as the Al K is at 1560 eV, but was present as determined by EDX).…”

Section: Cross-sectional Studies Of the Worn Surfacesmentioning

confidence: 95%

Wear and friction of TiAlN/VN coatings against Al2O3 in air at room and elevated temperatures

et al. 2010

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TiAlN/VN multilayer coatings exhibit excellent dry sliding wear resistance and low friction coefficient, reported to be associated with the formation of self-lubricating V2O5. To investigate this hypothesis, dry sliding ball-on-disc wear tests of TiAlN/VN coatings on flat stainless steel substrates were undertaken against Al2O3 at 25 0 C, 300 0 C and 635 0 C in air. The coating exhibited increased wear rate with temperature. The friction coefficient was 0.53 at 25 0 C, which increased to 1.03 at 300 0 C and decreased to 0.46 at 635 0 C. Detailed investigation of the worn surfaces was undertaken using site-specific transmission electron microscopy (TEM) via focused ion beam (FIB) microscopy, along with Fourier transform infrared (FTIR) and Raman spectroscopy. Microstructure and triboinduced chemical reactions at these temperatures were correlated with the coating's wear and friction behaviour. The friction behaviour at room temperature is attributed to the presence of a thin hydrated tribofilm and the presence of V2O5 at high temperature.

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Section: Cross-sectional Studies Of the Worn Surfacesmentioning

confidence: 95%

Wear and friction of TiAlN/VN coatings against Al2O3 in air at room and elevated temperatures

et al. 2010

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“…TEM samples were prepared using a Gatan-691 precision ion polishing system (PIPS). Details of TEM sample preparation can be found elsewhere [6,[9][10].…”

Section: Characterizationmentioning

confidence: 99%

“…In the associated wear mechanism studies, Raman spectroscopy of the wear debris detected V 2 O 5 -type structure [8]. Then more comprehensive analyses of the worn surfaces indicated the formation of an amorphous and multicomponent tribofilm on the worn surface as a result of a dynamic process of wear particle generation, powdering, tribo-oxidation, self agglomeration and adhesion to the parent worn surface [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent friction and wear of magnetron sputtered coating TiAlN/VN

Luo

2011

Wear

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In this paper, a magnetron sputtered nano-structured multilayer coating TiAlN/VN, grown on hardened tool steel substrate, has been investigated in un-lubricated ball-on-disk sliding tests against an alumina counterface, to study the friction and wear behaviours at a broad range of testing temperatures from 25 to 700 0 C, followed by comprehensive analysis of the worn samples . The associated wear mechanism changed to severe wear dominated by cracking and spalling. From 500 0 C and so on, accelerated oxidation of the TiAlN/VN became the controlling process. This led first to the massive generation of oxide debris and maximum friction of µ = 1.1 at 500 0 C, and then to fast deterioration of the coating despite the lowest friction coefficient of µ < 0.3 at 700 0 C.

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“…The EELS analysis addresses several findings. In the first, the spectra exhibit almost identical N-K, Ti-L2,3 and V-L2,3 edges, in terms of energy positions and the edge shapes, as compared to the carbon-free TiAlN/VN coating [41]. In particular, the N-K edge follows the ionization threshold at 398.5 eV consists of two strong and narrow peaks at 403.5 and 412.0 eV and a low and broad peak at 431.0 -438.5 eV, which are typical features of stoichiometric nitrides.…”

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confidence: 93%

Structure characterization and tribological study of magnetron sputtered nanocomposite nc-TiAlV(N,C)/a-C coatings

et al. 2011

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Grown by reactive unbalanced magnetron sputtering in a mixed N2 and CH4 gaseous medium, heterogeneous nanocomposite coatings in the Ti-Al-V-N-C system show extraordinarily excellent tribological performance of coated machining tools. Using analytical high resolution TEM, EELS, FEG-SEM, XRD, and Raman spectroscopy, this paper reports detailed structural and chemical characterization of the coatings grown at various CH4: N2 ratios. Meanwhile, the mechanical and tribological properties were also measured, including hardness, Young's modulus, residual stress and the dry-sliding friction and wear at varying environmental humidity. When CH4 gas was introduced in the deposition, the structure of the coatings has been found to experience a change from nano-scale TiAlN-VN multilayer architecture to a complex mixture of columnar grains of nc-TiAlV(N,C)/a-C nanocomposites and inter-column network of sp 2 -type amorphous carbon. Carbon incorporation and segregation also shows remarkable influence on the columnar growth model by leading to finer grain size. As compared to the carbon-free nitride coating, the nanocomposite coatings showed substantially reduced residual stress owing to the freecarbon precipitation, whereas the coatings maintained comparable hardness to the carbon-free TiAlN/VN. Their tribological properties were found to be strongly dependent on the environment. In humid air at RH > 30%, the coatings showed low friction coefficient less than 0.4 and extremely low wear rate at a scale of ~10 -17 m 3 N -1 m -1 .

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TEM-EELS study of low-friction superlattice TiAlN/VN coating: the wear mechanisms

Cited by 32 publications

References 36 publications

Wear and friction of TiAlN/VN coatings against Al2O3 in air at room and elevated temperatures

Wear and friction of TiAlN/VN coatings against Al2O3 in air at room and elevated temperatures

Temperature dependent friction and wear of magnetron sputtered coating TiAlN/VN

Structure characterization and tribological study of magnetron sputtered nanocomposite nc-TiAlV(N,C)/a-C coatings

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