Al-Si and Al-Si-Y coatings deposited by HS-PVD for the oxidation protection of γ-TiAl

Bobzin, Kirsten; Brögelmann, Tobias; Kalscheuer, Christian; Liang, T.

doi:10.1016/j.surfcoat.2018.06.074

Cited by 27 publications

(12 citation statements)

References 44 publications

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“…The liquid Al-Si alloy rapidly cooled and solidified. Al-Si binary alloys are eutectic alloys that undergo eutectic reactions during their solidification [33]. In the solidification and crystallization processes of an Al-Si alloy layer, the α(Al) solid solution phase is first precipitated, and a liquid-solid two-phase region composed of the liquid Al-Si alloy and solid α(Al) is formed.…”

Section: Discussionmentioning

confidence: 99%

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Wang

Zhou

et al. 2020

Coatings

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A composite coating composed of intermetallic compounds, Al–Si alloys, and an oxide ceramic layer was prepared on TA2 substrate by hot-dipping Al–Si alloy and micro-arc oxidation (MAO) methods. The microstructure and composition distribution of the resulting hot-dipped Al–Si alloy layer and MAO-caused ceramic layer were studied by scanning electron microscope (SEM) and energy dispersive spectrum (EDS). In addition, the phase composition of the diffusion layer obtained by the Al–Si alloy hot-dipping procedure was investigated by electron backscattered diffraction (EBSD), and the phase structure of the MAO-treated layer was studied by X-ray diffraction (XRD) analysis and X-ray photoelectron spectroscopy (XPS). The MAO method can make the hot-dipped Al–Si alloy layer in-situ oxidized to form a ceramic layer. Finally, a three-layer composite coating composed of a diffusion layer formed by the Ti–Al–Si interdiffusion, an Al–Si alloy layer and a ceramic layer was prepared on TA2 substrate. Compared with TA2 substrate, the TA2 sample with a three-layer composite coating has larger friction coefficient and less abrasion loss. The three-layer composite coating can significantly improve the wear resistance of TA2. A technical composite method was developed to the low cost in-situ growth of alumina-based ceramic wear-resistant coatings on TA2 substrate.

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Section: Discussionmentioning

confidence: 99%

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Wang

Zhou

et al. 2020

Coatings

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“…Fabrication of Si-Al, Al-Y, and Si-Al-Y layers on TiAl alloys have been shown to produce a series of different intermetallic layers (e.g., aluminide and silicide) and oxide layers, increasing the oxidation resistance of the coated alloys [227][228][229][230][231][232]. In particular, J. Xiang et al [232] Platinum aluminide coatings seem to protect the titanium alloys from oxidation as well as from hot corrosion, preventing the formation of the alpha phase.…”

Section: Aluminide and Chromizing Metallic Coatingsmentioning

confidence: 99%

“…They observed an excellent oxidation resistance of the Ti alloys up to 800 • C, thanks to Pt, which effectively promotes continuous alumina scale formation during high temperature exposure. Fabrication of Si-Al, Al-Y, and Si-Al-Y layers on TiAl alloys have been shown to produce a series of different intermetallic layers (e.g., aluminide and silicide) and oxide layers, increasing the oxidation resistance of the coated alloys [227][228][229][230][231][232]. In particular, J. Xiang et al [232] coated a Ti alloy by means of Si-Y co-deposition and aluminization, which, due to inward diffusion of Al atoms and outward diffusion of Ti and Nb atoms, gave rise to the formation of different mixed intermetallic layers and promoted the preferential development of Al2O3 on the surface in spite of the less resistant TiO2 oxide.…”

Section: Aluminide and Chromizing Metallic Coatingsmentioning

confidence: 99%

“…In particular, J. Xiang et al [ 232 ] coated a Ti alloy by means of Si-Y co-deposition and aluminization, which, due to inward diffusion of Al atoms and outward diffusion of Ti and Nb atoms, gave rise to the formation of different mixed intermetallic layers and promoted the preferential development of Al 2 O 3 on the surface in spite of the less resistant TiO 2 oxide. In a work by K. Bobzin et al [ 230 ], different coatings based on Si-Al and Si-Al-Y were deposited and tested on TiAl, showing an enhanced oxidation resistance thanks to Si and Y addition, promoting the formation of α-Al 2 O 3 , YAlO 3 , and a continuous intermetallic scale of TiSi, with consequent suppression of inward oxidation and outward Ti diffusion.…”

Section: Coatings For Ni- and Ti-based Alloys For Aerospace Enginementioning

confidence: 99%

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Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

et al. 2021

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Several applications where extreme conditions occur require the use of alloys often containing many critical elements. Due to the ever increasing prices of critical raw materials (CRMs) linked to their high supply risk, and because of their fundamental and large utilization in high tech products and applications, it is extremely important to find viable solutions to save CRMs usage. Apart from increasing processes’ efficiency, substitution, and recycling, one of the alternatives to preserve an alloy and increase its operating lifetime, thus saving the CRMs needed for its manufacturing, is to protect it by a suitable coating or a surface treatment. This review presents the most recent trends in coatings for application in high temperature alloys for aerospace engines. CRMs’ current and future saving scenarios in the alloys and coatings for the aerospace engine are also discussed. The overarching aim of this paper is to raise awareness on the CRMs issue related to the alloys and coating for aerospace, suggesting some mitigation measures without having the ambition nor to give a complete overview of the topic nor a turnkey solution.

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“…Al-based inter-metallics have been used for high-temperature applications because of their high melting points, strength, and oxidation resistance [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. For example, Ru-Al alloys have been applied for jet engine components, bond coats for thermal barrier coatings, corrosion-and oxidation-protective coatings, and electrodes [1,2], whereas Ta-Al alloys have been applied for sulfidation and oxidation-protective coatings [3][4][5], heater materials [12][13][14], and electromagnetic shielding [15].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Ta–Al Multilayer Coatings

Chen

Lin

2019

Coatings

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Ta-Al multilayer coatings were fabricated through cyclical gradient concentration deposition by direct current magnetron co-sputtering. The as-deposited coatings presented a multilayer structure in the growth direction. The oxidation behavior of the Ta-Al multilayer coatings was explored. The results specified that Ta-rich Ta-Al multilayer coatings demonstrated a restricted oxidation depth after annealing at 600 • C in 1% O 2 -99% Ar for up to 100 h. This was attributed to the preferential oxidation of Al, the formation of amorphous Al-oxide sublayers, and the maintenance of a multilayer structure. By contrast, Ta 2 O 5 formed after exhausting Al in the oxidation process in an ambient atmosphere at 600 • C which exhibited a crystalline Ta 2 O 5 -amorphous Al-oxide multilayer structure.

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Al-Si and Al-Si-Y coatings deposited by HS-PVD for the oxidation protection of γ-TiAl

Cited by 27 publications

References 44 publications

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

Oxidation Behavior of Ta–Al Multilayer Coatings

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