Oxidation behaviour of nanoscale TiAlN/VN multilayer coatings

Zhou, Zhaoxia; Rainforth, W. M.; Lewis, D.B.; Creasy, S.; Forsyth, Jeffrey; Clegg, Francis; Ehiasarian, Arutiun P.; Hovespian, P. E. H. Eh; Münz, W.‐D.

doi:10.1016/j.surfcoat.2003.09.031

Cited by 59 publications

(28 citation statements)

References 10 publications

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“…Thus, the wear product structure cannot be classified as any individual of the above oxides. This result can be explained by the fact that the tribofilm and wear debris analysed were in amorphous state and had multicomponent composition [25] whereas the sample spectra provided in literatures [20,35,36] were obtained in crystalline oxides with determined binary or ternary composition. In particular, it has been clarified that crystalline structured V2O5 oxide did not exist in the tribofilm.…”

Section: Elnes Analysis Of Tribofilm Wear Debris and The Tialn/vn Comentioning

confidence: 95%

“…As previous Raman spectroscopy of wear debris revealed weak presence of V2O5-like structure, further attempt was made to identify the oxide bonding structure by comparing the obtained O-K edge to those of known oxides, including V2O5 [20], Al2O3 [35], TiO2 [36], and Al2TiO5 [35]. The comparisons are shown in Figure 11.…”

Section: Elnes Analysis Of Tribofilm Wear Debris and The Tialn/vn Comentioning

confidence: 99%

“…Meanwhile, it was found in a series of iso-thermal annealing tests that TiAlN/VN coatings for a range of chemical compositions oxidize at temperatures between 500 and 700 0 C, which is obviously lower than the onset oxidation temperature of TiAlN (700-800 0 C). The oxidation led to the formation of a number of oxides, including V2O5 and other types like AlVO4, TiO2 and Al2TiO5 [15,20,21]. Note that the oxide V2O5 has an orthorhombic layer structure with layers stacking along the c-axis [22,23].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2006

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A 20-50 nm thick tribofilm was generated on the worn surface of a multilayer coating TiAlN/VN after dry sliding test against an alumina counterpart. The tribofilm was characterized by applying analytical transmission electron microscopy techniques with emphasis on detailed electron energy loss spectrometry and energy loss near edge structure analysis. Pronounced oxygen in the tribofilm indicated a predominant tribo-oxidation wear. Structural changes in the inner-shell ionization edges of N, Ti and V suggested decomposition of nitride fragments.

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Section: Elnes Analysis Of Tribofilm Wear Debris and The Tialn/vn Comentioning

confidence: 95%

Section: Elnes Analysis Of Tribofilm Wear Debris and The Tialn/vn Comentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2006

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“…The full details of the high temperature oxidation are reported elsewhere [4]. High temperature XRD showed that V 2 O 5 was first detected at 597ºC, and the intensity increased to a peak at 638ºC, followed by a decrease to zero around ≥678ºC, consistent with the melting temperature of this phase.…”

Section: Resultsmentioning

confidence: 68%

“…o C for 30mins. The selected area diffraction patterns on the left are from the top particle (arrowed) of the TEM micrograph and have been indexed as AlVO 4 . The diffraction patterns on the right hand side are indexed as TiO 2 (rutile), from the particle arrowed accordingly.…”

Section: Resultsmentioning

confidence: 99%

On the structure and oxidation mechanisms in nanoscale hard coatings

Rainforth

Zhou

2006

J. Phys.: Conf. Ser.

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Abstract. Thin-film structures consisting of alternating nanoscale multilayers show substantial hardness increases compared with monolithic coatings of the constituent materials. Coatings, such as TiAlN/VN are deposited using PVD with individual coating bi-layer thickness of ~3nm. Since TiAlN and VN are isostructural and mutually soluble, mixing of the two layers during deposition is expected, which will inevitably affect properties. Energy filtered TEM using a field emission gun source allowed important information on layer structure, but failed to reveal details <1nm. Spherical aberration corrected scanning transmission electron microscopy (STEM) allowed the composition of individual atomic columns to be probed, which yielded a good match between experiment and numerical models of the layer mixing. For high speed machining operations, the oxidation behaviour of coatings becomes an important consideration. Static oxidation of TiAlN/VN films was studied in the range 550-700 o C, and characterised by high temperature in-situ XRD and STEM/EDX/EELS of selected surface cross-sections. Oxidation of the TiAlN/VN coating started at ≥550°C with the VN being the first component to oxidise. At temperatures >600 o C, a duplex oxide structure was formed, with several phases observed, including V 2 O 5 , TiO 2 and AlVO 4 , with V 2 O 5 being the dominant oxide at the outer layer at 638°C. These coatings exhibit low friction in dry sliding which is believed to arise from the inherently low friction of V 2 O 5 . Focused ion beam studies of wear tests at 630°C confirmed that the contact surface comprised small (~50nm), equiaxed and largely agglomerated V 2 O 5 crystals, confirming the hypothesis.

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Adhesion, atomic structure, and bonding variation at TiN/VN interface by chemical segregation

Yin

Peng

Qin

et al. 2012

Surface & Interface Analysis

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Introduction of alloying elements often alters properties of materials. In the technologically significant multilayered superlattice coatings, interfaces are known to play a key role in the deformation mechanisms, especially in the phenomenon of interfaceinduced superhardness at nanoscale. Here, we elucidate, by first-principles calculations, atomic structure of TiN/VN interface and its relationship to adhesion upon introducing Cr, Mo, Ta, Y, Al, Nb, Zr, and Sc, the very commonly occurring alloying elements in the coating. We find that the elements Cr, Mo, Ta, Y weaken substantially interfacial adhesion, whereas the others modify adhesion only slightly. The bond length, charge transfer, and interactions between atoms at interface are found to be the key factors to understanding the origin of shift in properties in the coatings with the chemical alloying. Using several methods of analysis, we have clarified electronic mechanism behind the variation induced by alloying elements and determined the interfacial bonding nature to be mainly ionic with a certain degree of covalency. The theoretical calculations presented provide insight into the complex electronic properties of the TiN/VN interfaces with alloying elements. Our findings help enhance performances of the multilayered coatings for wide-ranging applications.

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Oxidation behaviour of nanoscale TiAlN/VN multilayer coatings

Cited by 59 publications

References 10 publications

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

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

On the structure and oxidation mechanisms in nanoscale hard coatings

Adhesion, atomic structure, and bonding variation at TiN/VN interface by chemical segregation

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