Increasing the oxidation resistance of γ-TiAl by applying a magnetron sputtered aluminum and silicon based coating

Bauer, Peter-Philipp; Laska, Nadine; Swadźba, Radosław

doi:10.1016/j.intermet.2021.107177

Cited by 19 publications

(20 citation statements)

References 60 publications

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“…These alloys, thanks to their properties, are used even at temperatures above 600 °C, where classical titanium alloys are not suitable for use due to low creep and oxidation resistance [ 1 , 2 ]. Recent research works [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ] largely concern improving the oxidation resistance of Ti-Al intermetallic alloys.…”

Section: Introductionmentioning

confidence: 99%

Resistance to High-Temperature Oxidation of Ti-Al-Nb Alloys

Małecka

2022

Materials

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The research presented in this paper concerns the assessment of the resistance to high-temperature oxidation behaviour of a Ti-46Al-7Nb-0.7Cr-0.1Si-0.2Ni alloy and the explanation of the role of niobium during oxidation processes. The basic problem concerned the evaluation of the resistance of the studied alloy to cyclic oxidation in an air atmosphere, with particular attention to the influence of temperature, surface roughness and cooling rate from heating temperature to room temperature. The issue analysed was the effect of niobium addition on the corrosion kinetics as a high-melting element causing improved oxidation resistance, contributing to the reduction in the oxidation rate.

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Section: Introductionmentioning

confidence: 99%

Resistance to High-Temperature Oxidation of Ti-Al-Nb Alloys

Małecka

2022

Materials

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“…In the presence of Al, the Ti 5 Si 3 phase can have a positive impact on the oxidation resistance of Al-rich coatings: in several studies, the formation of Ti 5 Si 3 in Al-Si-based coatings on γ-TiAl alloys was observed [31][32][33]. Segregation of the Ti 5 Si 3 phase at the grain boundaries of the TiAl 2 and TiAl 3 phases embedded in an Al-rich matrix of Al-Si-based coatings can act as an Al diffusion barrier [34].…”

Section: Introductionmentioning

confidence: 99%

“…Segregation of the Ti 5 Si 3 phase at the grain boundaries of the TiAl 2 and TiAl 3 phases embedded in an Al-rich matrix of Al-Si-based coatings can act as an Al diffusion barrier [34]. Moreover, the inhibited Al diffusion due to the Ti 5 Si 3 phase can counteract the Al depletion in Al-rich Ti-Al coatings [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Previous thermodynamic calculations showed that the formation of Ti 5 Si 3 from the Ti(Al,Si) 3 phase helps with decelerating the transformation of the protective TiAl 3 to TiAl 2 and eventually to a non-protective TiAl. This is due to the fact that Ti is "gettered" by the formation of Ti 5 Si 3 when Al is consumed into the Al 2 O 3 growth [32,33] and thus also suppresses the formation of non-protective TiO 2 . However, the formation of the Ti 5 Si 3 phase in Al-Si coatings on TiAl alloys can also have a detrimental effect: prior to the formation of stable and slow-growing α-Al 2 O 3 , the development of a metastable and fast-growing θ-Al 2 O 3 was already reported during the initial oxidation processes of TiAl 3 at 900 • C by Gauthier et al [12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Si Content on Deposition and High-Temperature Oxidation of Al-Si Coatings Obtained by Magnetron Sputtering PVD Method

et al. 2022

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Intermetallic Al-Si-based coatings can greatly increase the oxidation resistance of γ‑TiAl alloys. However, the effects of the Si addition are not fully understood. Therefore, it is difficult to determine the Si content that is optimal for oxidation resistance. Therefore, pure Al and several Al-Si coatings with varying Si contents between 1 and 81 at.% were studied. The coatings were produced using a combinatorial magnetron sputtering process. Scanning electron microscopy and energy dispersive X-ray spectroscopy were used for structure and chemical analysis. The phases were identified by X‑ray diffraction. Cyclic oxidation tests at 900 °C were conducted up to 5000 cycles of 1 h each and subsequently evaluated by thermogravimetric analysis. Si addition in the range of 1 to 12 at.% did not deteriorate the oxidation resistance compared to a pure Al coating up for 1000 cycles (1 h) of oxidation at 900 °C, while higher Si contents led to a high mass gain. For oxidation times up to 5000 cycles (1 h), a sufficient thickness of the coatings is crucial for good oxidation resistance. The main effect of Si addition is to enhance the transformation speed of the deposited Al and Si to the high temperature stable Ti(Al,Si)3 phase during the heat treatment. Si additions of up to 12 at.% led to increased initial mass gains and a decrease in the oxidation rates during subsequent exposures compared to pure Al coatings.

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“…Most previously applied coating materials on TiAl alloys were based on Ti-Al-Cr, [18][19][20] Al-Ti, [21,22] or Al-Si. [23,24] While they provide excellent oxidation protection, they finally degrade due to an Al depletion in the coating material, which consequently results in the formation of nonprotective oxides such as TiO 2 . Combining a TiAl substrate with a MAX-phase forming coating is a promising approach, as the substrate material may serve as an Al reservoir, resupplying the coating by outward diffusion of Al.…”

Section: Introductionmentioning

confidence: 99%

Sputtering and Characterization of MAX‐Phase Forming Cr–Al–C and Ti–Al–C Coatings and Their Application on γ‐Based Titanium Aluminides

et al. 2021

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MAX‐phases are of increasing interest as coating material for high temperature applications due to their unique metallic as well as ceramic properties. Herein, the deposition of Cr2AlC and Ti3AlC2 or Ti2AlC MAX‐phase forming coatings by magnetron sputtering is demonstrated. Using pure elemental targets, the manufacturing with a coating thickness of above 7 μm is established. The MAX‐phase forming coatings are characterized by high‐temperature X‐ray diffraction (HT‐XRD) measurements and provide a good oxidation behavior due to the development of protective thermally grown oxide layers. The performance of the MAX‐phases is strongly depended on the substrate material and the accompanying interdiffusion processes. Therefore, the Ti–Al–C coating is favored for TiAl alloys due to the thermodynamic stability of the Ti2AlC MAX phase in particular in the presence of the γ‐TiAl phase. An excellent oxidation behavior is confirmed up to 300 h at 850 °C due to the development of an alumina layer above a homogenous Ti2AlC phase coating. The Cr2AlC MAX‐phase coating degrades after 100 h at 800 °C due to interdiffusion processes between coating and substrate and the accompanying development of carbides and nitride phases. Nevertheless, the oxidation resistance of the Cr–Al–C‐coated TiAl alloy is given by the formation of the Ti2AlC MAX‐phase.

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Increasing the oxidation resistance of γ-TiAl by applying a magnetron sputtered aluminum and silicon based coating

Cited by 19 publications

References 60 publications

Resistance to High-Temperature Oxidation of Ti-Al-Nb Alloys

Resistance to High-Temperature Oxidation of Ti-Al-Nb Alloys

Effect of Si Content on Deposition and High-Temperature Oxidation of Al-Si Coatings Obtained by Magnetron Sputtering PVD Method

Sputtering and Characterization of MAX‐Phase Forming Cr–Al–C and Ti–Al–C Coatings and Their Application on γ‐Based Titanium Aluminides

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