Hot corrosion behavior of a Si Y co-deposition coating on a Ti2AlNb based alloy in NaCl-Na2SO4 mixture

Xiang, Jiayi; Xie, Fei; Wu, Xiangqing; Wang, Shaoqing; Li, Lang

doi:10.1016/j.surfcoat.2021.127282

Cited by 16 publications

(4 citation statements)

References 40 publications

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“…Ti + 3Al → TiAl 3 (10) TiAl 3 + 3Si + Ce → (Ti, Ce)(Al, Si) 3 (11) Ti atoms [34,35] and finally form (Ti,Ce)(Al,Si)3 composite phase layer, and the excess alloy liquid forms the Al-Si layer. The schematic diagram of formation mechanism of alloy layer was shown in Figure 9.…”

Section: Crackmentioning

confidence: 99%

“…The second solution was to prepare a protective coating on the surface of the titanium alloy [11] without changing the titanium alloy substrate so as to prevent the oxidation of the titanium alloy. Because Ti-Al coating had the advantages of high specific strength, high specific elastic modulus, low density, good oxidation resistance, high corrosion resistance, high creep resistance, and high fatigue resistance, it had great development potential [12].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Influence Law of Ce on Microstructure and High-Temperature Oxidation Resistance of Ti-Al-Si Composite Coating

Zeng

2023

Coatings

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High-temperature titanium alloys are widely used in aerospace hot parts; however, the thermal barrier temperature of 600 °C limits its service temperature. In this paper, a two-step hot-dip plating method is proposed to prepare the composite coating containing Ce on the surface of titanium alloy, which can make the oxidation resistance temperature of titanium alloy reach 800 °C The microstructure, phase composition, and element distribution of Ce-containing Ti-Al-Si hot-dip coating, Ce-containing Ti-Al-Si pre-oxidation coating and Ce-containing Ti-Al-Si high-temperature oxidation coating were studied. The results showed that the Ti-Al-Si hot-dip coating containing Ce was mainly composed of (Ti,Ce)(Al,Si)3 alloy phase layer, and the Ti-Al-Si pre-oxidation coating containing Ce was mainly composed of Ti-Al binary system phase layer and dense Al2O3 layer rich in CeO2. Ce in the high-temperature oxidation coating of Ti-Al-Si containing Ce was mainly distributed in Ti3Al, TiAl, TiAl3 + Ti5Si3 mixed phase layer and Al2O3. The addition of Ce could improve the uniformity of composite coating, prevent the spread of cracks, and improve the high-temperature oxidation resistance of Ti-Al-Si coating.

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Section: Crackmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Influence Law of Ce on Microstructure and High-Temperature Oxidation Resistance of Ti-Al-Si Composite Coating

Zeng

2023

Coatings

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“…In the case of the Si-Co-Y diffusion coating under hot corrosion, the TiSi2 outer layer came into direct contact with corrosive medium of O2, Cl2 and S at the initial stage of hot corrosion, and underwent reactions at high temperatures [25,26]: S2 and Cl2 generated by reactions (19) to (22) can infiltrate into the coating and react with Ti, Si again, resulting in a self-sustaining sulfurization/oxidation process. Thus, S2 and Cl2 can act as catalysts, accelerating the oxidation process of the coating.…”

Section: Morphology Of Hot Corrosion Productsmentioning

confidence: 99%

Microstructure and Hot Corrosion Property of a Si–Co–Y Diffusion Coating Deposited on TiAl–Nb Alloy

Li,

Lv,

Xie

et al. 2023

High Temperature Corrosion of mater.

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Si-Co-Y diffusion coatings were deposited on TiAl-Nb alloy using pack cementation process. The influence of activators and deposition temperatures on the coating structures was investigated, alongside the coating formation process and hot corrosion performance of the optimized coating in molten salt of 25%NaCl+75%K2SO4 at 850 ℃. The results show that a dense and compact Si-Co-Y diffusion coating can be prepared on TiAl-Nb alloy, with a multi-layered structure including an outmost layer of (Ti,X)Si2 (X represents Co, Al, Nb, Y), an outer layer composed of TiSi2+Ti5Si4+Ti5Si3 mixtures, a middle layer of Ti5Si3, and an inner layer of TiAl2. The coating prepared with AlCl3•6H2O and NH4Cl had many pores. Increase in deposition temperature led to a higher coating growth rate within the range of 1050-1100 o C, but temperature exceeding 1100 ℃ caused the formation of intensive holes in the coating. Hot corrosion tests at high temperatures proved that the Si-Co-Y diffusion coating prepared on TiAl-Nb alloy exhibited excellent hot corrosion resistance in 25%NaCl-75%K2SO4 molten at 850 o C. A protective hot corrosion product scale composed of a TiO2+Na2SiO3+Na2TiO3 outer layer and an Al2O3 middle layer, formed on coating after hot corrosion for 50 h. The scale can effectively inhibit the inward diffusion of corrosion medial of O, Cl and S elements.

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“…The second solution is to prepare a protective coating on the surface of the titanium alloy [11] without changing the titanium alloy substrate, so as to prevent the oxidation of the titanium alloy. Because Ti-Al coating has the advantages of high specific strength, high specific elastic modulus, low density, good oxidation resistance, high corrosion resistance, high creep resistance and high fatigue resistance, it has great development potential [12].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence Law of Ce on Microstructure and High Temperature Oxidation Resistance of Ti-Al-Si Composite Coating

Zeng¹,

Li²

2023

Preprint

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High temperature titanium alloys are widely used in aerospace hot parts, however, the thermal barrier temperature of 600 oC limits its service temperature. In this paper, a two-step hot-dip plating method is proposed to prepare the composite coating containing Ce on the surface of titanium alloy, which can make the oxidation resistance temperature of titanium alloy reach 800 oC The microstructure, phase composition and element distribution of Ce-containing Ti-Al-Si hot-dip coating, Ce-containing Ti-Al-Si pre-oxidation coating and Ce-containing Ti-Al-Si high-temperature oxidation coating were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The results show that the Ti-Al-Si hot-dip coating containing Ce is mainly composed of (Ti,Ce)(Al,Si)3 alloy phase layer, and the Ti-Al-Si pre-oxidation coating containing Ce is mainly composed of Ti-Al binary system phase layer and dense Al2O3 layer rich in CeO2. Ce in the high temperature oxidation coating of Ti-Al-Si containing Ce is mainly distributed in Ti3Al, TiAl, TiAl3+Ti5Si3 mixed phase layer and Al2O3. The addition of Ce can promote the formation of continuous Al2O3 layer, improve the uniformity of composite coating, prevent the spread of cracks, and improve the high temperature oxidation resistance of Ti-Al-Si coating.

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Hot corrosion behavior of a Si Y co-deposition coating on a Ti2AlNb based alloy in NaCl-Na2SO4 mixture

Cited by 16 publications

References 40 publications

Study on the Influence Law of Ce on Microstructure and High-Temperature Oxidation Resistance of Ti-Al-Si Composite Coating

Study on the Influence Law of Ce on Microstructure and High-Temperature Oxidation Resistance of Ti-Al-Si Composite Coating

Microstructure and Hot Corrosion Property of a Si–Co–Y Diffusion Coating Deposited on TiAl–Nb Alloy

Study on the Influence Law of Ce on Microstructure and High Temperature Oxidation Resistance of Ti-Al-Si Composite Coating

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