Microstructure and Oxidation Behavior of NiCoCrAlY Coating With Different Sm2O3 Concentration on TiAl Alloy

Gong, Xue; Chen, R. R.; Wang, Y.; Su, Yan; Guo, Jing; Fu, Hengzhi

doi:10.3389/fmats.2021.710431

Cited by 6 publications

(2 citation statements)

References 32 publications

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“…It has been widely applied in turbine blades and other components for high-temperature applications. MCrAlY coatings are usually used as single overlayers or bond coatings as thermal barrier coatings (TBC) [37].…”

Section: Introductionmentioning

confidence: 99%

Behaviour Aspects of an EB-PVD Alumina (Al2O3) Film with an Interlayer (NiCrAlY) Deposited on AISI 316L Steel Investigated in Liquid Lead

Petrescu

Nitu

Golgovici

et al. 2023

Metals

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The use of lead as a primary coolant is one of the most attractive options for next-generation lead-cooled fast reactor systems (LFR). Despite many favourable features, liquid Pb is a harsh environment that induces many problems on metallic components. Therefore, candidate materials for LFR must be qualified, and the solutions to improve their properties must be found. This paper’s objective is to present the results obtained from the tensile tests of AISI 316L steel in liquid lead at 400 °C, 450 °C, and 500 °C, and the short-term corrosion tests performed on coated and uncoated AISI 316L steel at 550 °C. The coating was made of Al2O3 with a CrNiAlY interlayer using the electron beam-physical vapor deposition (EB-PVD) technique. Both the mechanical and corrosion tests were performed in stagnant lead saturated with oxygen. After testing, the specimens were characterised by several analyses, including scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), optical microscopy (OM), scratching test, and Vickers micro-hardness test. The tensile test results highlight the ductile behaviour of the material, and in the case of the corrosion tests, the coatings prove to be effective in protecting the substrate from the harsh environment.

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Section: Introductionmentioning

confidence: 99%

Behaviour Aspects of an EB-PVD Alumina (Al2O3) Film with an Interlayer (NiCrAlY) Deposited on AISI 316L Steel Investigated in Liquid Lead

Petrescu

Nitu

Golgovici

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…In recent decades, various methods have been utilized to prepare protective coatings for TiAl alloys, such as aluminide coatings (TiAl3, TiAl2, etc.) [5], M-CrAlY (M=Ni, Co or NiCo) coatings [6,7], ceramic coatings [8,9], silicide coatings [10][11][12] and composite coatings doped with noble metals [13]. Among the these coating systems, silicide coatings exhibit excellent thermal stability and can form a flowable and self-healing SiO2 protective scale at high temperatures, making them suitable for load-bearing applications in TiAl alloys [14].…”

Section: Introductionmentioning

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

Preprint

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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 oC, 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 oC. 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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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.

show abstract

Microstructure and Oxidation Behavior of NiCoCrAlY Coating With Different Sm2O3 Concentration on TiAl Alloy

Cited by 6 publications

References 32 publications

Behaviour Aspects of an EB-PVD Alumina (Al2O3) Film with an Interlayer (NiCrAlY) Deposited on AISI 316L Steel Investigated in Liquid Lead

Behaviour Aspects of an EB-PVD Alumina (Al2O3) Film with an Interlayer (NiCrAlY) Deposited on AISI 316L Steel Investigated in Liquid Lead

Microstructure and hot corrosion property of a Si-Co-Y diffusion coating deposited on TiAl-Nb alloy

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

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