Thermal stability of TiAlN/CrN multilayer coatings studied by atom probe tomography

Choi, Pyuck‐Pa; Povstugar, Ivan; Ahn, Jae Pyung; Kostka, Aleksander; Raabe, Dierk

doi:10.1016/j.ultramic.2010.11.012

Cited by 32 publications

(9 citation statements)

References 35 publications

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“…Exposure temperatures of up to 1000 °C promoted significant coating microstructure modifications as nanostructured multilayers started to dissolve. Similar multilayer structural degradation on similar coatings was also reported in [89,90]. A further possible microstructure explanation of the concurring chemical structure modification in the AlTiCrxN1-x coating observed from 800 °C is possibly related to the spinodal decomposition of the multilayered coating structure in TiCr-rich compounds that tend to diffuse into the tool steel substrate (according to [91]).…”

Section: Hard Coatings Of Tools As a Means Of Saving Crmssupporting

confidence: 76%

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

et al. 2021

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The Critical Raw Materials (CRMs) list has been defined based on economic importance and supply risk by the European Commission. This review paper describes two issues regarding critical raw materials: the possibilities of their substitution in iron-based alloys and the use of iron-based alloys instead of other materials in order to save CRMs. This review covers strategies for saving chromium in stainless steel, substitution or lowering the amounts of carbide-forming elements (especially tungsten and vanadium) in tool steel and alternative iron-based CRM-free and low-CRM materials: austempered ductile cast iron, high-temperature alloys based on intermetallics of iron and sintered diamond tools with an iron-containing low-cobalt binder.

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Section: Hard Coatings Of Tools As a Means Of Saving Crmssupporting

confidence: 76%

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

et al. 2021

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“…At higher temperatures, phase separation into cubic TiN and hexagonal AlN via spinodal decomposition was observed. Similar results were obtained for TiAlNyCrN multilayers [57]. Regarding the as-deposited structure, they were thermally stable up to 600 C. At 700 C, the TiAlN layers decomposed into Ti-rich and Alrich layers, whereas the CrN layers remained intact, as revealed by atom probe tomography analyses.…”

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confidence: 81%

Oxidation behaviour of TiAlYN/CrN and CrAlYN/CrN nanoscale multilayer coatings with Al₂O₃topcoat deposited on γ-TiAl alloys

Braun

Lange

Hovsepian

et al. 2011

Materials at High Temperatures

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TiAlYNyCrN and CrAlYNyCrN nanoscale multilayer coatings were deposited on g-TiAl specimens using magnetron sputtering techniques. The nitride layers were manufactured by unbalanced magnetron sputtering (UBM) and high power impulse magnetron sputtering (HIPIMS). The CrAlYNyCrN coatings had an oxy-nitride overcoat. On some of the coated samples an additional alumina topcoat was deposited. The oxidation behaviour of the different coatings was investigated at 750 and 850 C performing quasi-isothermal oxidation tests in laboratory air. Mass change data were measured during exposure up to failure or the maximum exposure length of 2500 h. When exposed to air at 750 C, the Ti-based nitride films exhibited higher oxidation resistance than the Ti -45Al -8Nb substrate material. The alumina topcoat enhanced the oxidation protection of this coating system, acting as diffusion barrier to oxygen penetration. At 850 C, the TiAlYNyCrN films exhibited poor stability and rapidly oxidised, and therefore were not applicable for long-term protective coatings on g-TiAl alloys. The beneficial effect of the additional Al 2 O 3 layer was less pronounced at this exposure temperature. The Cr-based nitride films exhibited high oxidation resistance during exposure at 850 C. HIPIMS deposition improved the oxidation behaviour of the CrAlYNyCrN nanoscale multilayer coatings in comparison to UBM coatings. For these coatings, the decomposed and partially oxidised nitride films were an effective barrier to oxygen inward diffusion. The alumina topcoat did not significantly increase the oxidation resistance of the g-TiAl alloy coated with Cr-based nitride films.

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“…In particular, temperatures within a range from 500 to 800°C are usually detected at relatively low cutting speeds v c , when the mechanisms of adhesive and abrasive wear play a key role, while oxidation and diffusion processes are relatively weakly expressed [33][34][35]. A range of temperatures within 800-900°C is typical for significantly high cutting speeds, when oxidation and diffusion processes begin to play an important role, and the destruction of the external layers of the coating begins due to spinodal decomposition [11,[36][37][38]. At the same time, such elevated temperatures trigger the formation of protective oxide films, which have a positive influence on the tribological parameters of the cutting process.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Elemental Composition and Nanostructure of Multilayer Composite Coatings on Their Tribological Properties at Elevated Temperatures

Vereschaka¹,

Sergey²,

Табаков³

et al. 2021

Tribology in Materials and Manufacturing - Wear, Friction and Lubrication

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The chapter discusses the tribological properties of samples with multilayer composite nanostructured Ti-TiN-(Ti,Cr,Al,Si)N, Zr-ZrN-(Nb,Zr,Cr,Al)N, and Zr-ZrN-(Zr,Al,Si)N coatings, as well as Ti-TiN-(Ti,Al,Cr)N, with different values of the nanolayer period λ. The relationship between tribological parameters, a temperature varying within a range of 20–1000°C, and λ was investigated. The studies have found that the adhesion component of the coefficient of friction (COF) varies nonlinearly with a pronounced extremum depending on temperature. The value of λ has a noticeable influence on the tribological properties of the coatings, and the nature of the mentioned influence depends on temperature. The tests found that for the coatings with all studied values of λ, an increase in temperature first caused an increase and then a decrease in COF.

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Thermal stability of TiAlN/CrN multilayer coatings studied by atom probe tomography

Cited by 32 publications

References 35 publications

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

Oxidation behaviour of TiAlYN/CrN and CrAlYN/CrN nanoscale multilayer coatings with Al₂O₃topcoat deposited on γ-TiAl alloys

The Effect of Elemental Composition and Nanostructure of Multilayer Composite Coatings on Their Tribological Properties at Elevated Temperatures

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Thermal stability of TiAlN/CrN multilayer coatings studied by atom probe tomography

Cited by 32 publications

References 35 publications

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

Oxidation behaviour of TiAlYN/CrN and CrAlYN/CrN nanoscale multilayer coatings with Al2O3topcoat deposited on γ-TiAl alloys

The Effect of Elemental Composition and Nanostructure of Multilayer Composite Coatings on Their Tribological Properties at Elevated Temperatures

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Oxidation behaviour of TiAlYN/CrN and CrAlYN/CrN nanoscale multilayer coatings with Al₂O₃topcoat deposited on γ-TiAl alloys