Oxidation Behavior of Ta–Al Multilayer Coatings

Chen, Yung-I; Lin, Nai-Yuan; Ke, Yi-En

doi:10.3390/coatings9120810

Cited by 2 publications

(2 citation statements)

References 31 publications

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“…Figure 2 shows that complex oxide films were formed on the sample surface during heat treatment; these were oxides of chromium and titanium. Similar phases appear under conditions of high-speed dry cutting [7]. Mullite-like (Al-Si-O) tribo-films with a high protective ability are also formed [8].…”

Section: Resultsmentioning

confidence: 75%

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Features of the Oxidation of Multilayer (TiAlCrSiY)N/(TiAlCr)N Nanolaminated PVD Coating during Temperature Annealing

et al. 2023

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A nano-multilayer Ti0.2Al0.55Cr0.2Si0.03Y0.02N/Ti0.25Al0.65Cr0.1N PVD coating was deposited on Kennametal carbide K 313 inserts. These coatings are widely used to protect cutting tools under severe exploitation conditions. Under equilibrium conditions, it was found that the Al2O3 oxide possessed better adhesive properties than the TiO2. The addition of chromium further enhanced the oxidation resistance of the coatings. Silicon significantly increased the oxidation resistance of this type of coating. The properties of the diffusion process in this coating have not been sufficiently investigated, despite the considerable number of articles published on this topic. For the purpose of this study, a multilayer ion-plasma (TiAlCrSiY)N/(TiAlCr)N coating was oxidized under equilibrium conditions; its chemical inhomogeneity was studied by time-of-flight mass spectroscopy using a TOF SIMS5-100 instrument. The data was collected from an area of 100 × 100 µ. A D-300 profilometer (KLA-Tencor Corp., Milpitas, California 95035, USA) was used to determine the rate of ion etching. It was found that oxidation commenced at the surface nanolayer of a TiAlCrN nitride, forming loose films of Cr2O3, TiO2, and Al2O3 oxides. This passivating film had a thickness of around 140 nm. For the first time, the interlayer diffusion coefficients of Si and Y were determined in multilayer coatings based on Ti0.2Al0.55Cr0.2Si0.03Y0.02N/Ti0.25Al0.65Cr0.1N, under open air annealing at 700 °C. The physical nature of the differences in the diffusion of these elements is discussed. The diffusion rate in the near-surface volumes was lower than in the deep layers of the multilayer coating, most likely due to the formation of passivating oxide films on the surface.

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Section: Resultsmentioning

confidence: 75%

“…At first, the formation of amorphous Al 2 O 3 oxides is predominant, but once aluminum is depleted, tantalum starts to oxidize into crystalline Ta 2 O 5 . Both oxides have high hardness and low thermal conductivity [7]. There have also been positive experiences using nitride-based coatings with ytterbium or yttrium additives [8,9].…”

Section: Introductionmentioning

confidence: 99%