A review on environmental barrier coatings: History, current state of the art and future developments

Tejero-Martin, Daniel; Bennett, Chris; Hussain, Tanvir

doi:10.1016/j.jeurceramsoc.2020.10.057

Cited by 276 publications

(121 citation statements)

References 98 publications

Supporting

Mentioning

120

Contrasting

Order By: Relevance

“…A dense environmental barrier coating (EBC) is commonly applied on CMC-SiC materials to alleviate the damage from volatilization of the oxidized product of silica in a highvelocity water vapor environment. Furthermore, with the increase in engine service temperatures, there is also the danger of corrosion from siliceous debris, also named calcia-magnesia-aluminosilicate (CMAS), in the form of volcanic ash, airborne sand, and runaway debris [2][3][4][5]. Thus, ideal EBC materials should also effectively alleviate CMAS corrosion of the CMC-SiC matrix at high temperatures.…”

Section: Introduction mentioning

confidence: 99%

“…Molten CMAS attached to a coating surface can substantially reduce the high temperature capability of EBCs and compromise their performance through a 2 J Adv Ceram 2021, 10(5): 0-0 www.springer.com/journal/40145 CMAS-EBC interaction. Thus, new EBC materials that are resistant to molten CMAS corrosion are urgently required [2][3][4][5][6]. Rare-earth (RE) disilicates are considered as promising materials for EBC applications due to their good corrosion resistance, similar coefficient of thermal expansion (CTE) as CMC-SiC, and excellent high-temperature stability [7][8][9][10][11].…”

Section: Introduction mentioning

confidence: 99%

See 1 more Smart Citation

Interaction of multicomponent disilicate (Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7 with molten calcia-magnesia-aluminosilicate

et al. 2021

View full text Add to dashboard Cite

Environmental barrier coating (EBC) materials that are resistant against molten calcia-magnesia-aluminosilicate (CMAS) corrosion are urgently required. Herein, multicomponent rare-earth (RE) disilicate ((Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7, (5RE)2Si2O7) was investigated with regard to its CMAS interaction behavior at 1400 °C. Compared with the individual RE disilicates, the (5RE)2Si2O7 material exhibited improved resistance against CMAS attack. The dominant process involved in the interaction of (5RE)2Si2O7 with CMAS was reaction-recrystallization. A dense and continuous reaction layer protected the substrate from rapid corrosion at high temperatures. The results demonstrated that multicomponent strategy of RE species in disilicate can provide a new perspective in the development of promising EBC materials with improved corrosion resistance.

show abstract

Section: Introduction mentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Interaction of multicomponent disilicate (Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7 with molten calcia-magnesia-aluminosilicate

et al. 2021

View full text Add to dashboard Cite

show abstract

“…CMC materials are known to be negatively affected by the presence of steam, which is expected to be a large fraction of the expanding gas stream in this application. Therefore, a suitable Environmental Barrier Coating (EBC) should be also developed, as already proposed for some modern aeronautical gas turbine engines [50].…”

Section: System Modellingmentioning

confidence: 99%

Simulation of the HiPowAR power generation system for steam-nitrogen expansion after ammonia oxidation in a high-pressure oxygen membrane reactor

2021

View full text Add to dashboard Cite

The EU project HiPowAR studies a novel power generation system based on ammonia flameless oxidation with pure oxygen in a high-pressure membrane reactor and expansion of the resulting high-temperature H2O-N2 stream. The system combines the advantages of high temperature at expander inlet, typical of gas turbines, and small compression demand, typical of steam cycles. Water is injected into the reactor to control the very high adiabatic temperature, at the limited energy expenditure of liquid pumping. This work assesses the performance potential of the HiPowAR system under different design conditions, through simulations with a model developed in Aspen Plus®. The system shows a high efficiency (up to 55%) when operating at high temperature (e.g., 1350°C at expander inlet); hence, O2 membranes capable of working at very high temperature are required. The cycle features an optimal sub-atmospheric expansion pressure (in the range 0.1-0.2 bar), which requires the re-pressurization of the off-gas (steam-saturated nitrogen). The system also produces liquid water as a net output. A reduction of the expander inlet temperature to values acceptable by typical steam cycles (600°C) significantly limits the efficiency, despite allowing to demonstrate the process using conventional steam expanders.

show abstract

“…Environmental barrier coatings (EBCs) were then developed to negate the pernicious effects that CMAS and steam have on CMCs components [18]. The current generation of EBCs generally presents a rare earth silicate top layer, providing direct protection against CMAS attack and silica volatilization.…”

Section: Introductionmentioning

confidence: 99%

“…The current generation of EBCs generally presents a rare earth silicate top layer, providing direct protection against CMAS attack and silica volatilization. Several compositions have been suggested and studied [18], each one with its own set of advantages and disadvantages. Among those compositions, ytterbium disilicate (referred to as YbDS in this work)…”

Section: Introductionmentioning

confidence: 99%

Steam Degradation of Ytterbium Disilicate Environmental Barrier Coatings: Effect of Composition, Microstructure and Temperature

Tejero-Martin¹,

Bai²,

Romero³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Recession of environmental barrier coatings (EBC) in environments containing steam is a pressing concern that requires further research before their implementation in gas turbine engines can be realized. In this work, free-standing plasma sprayed Yb2Si2O7 coatings were exposed to flowing steam at 1350 °C and 1400 °C for 96 h. Three samples were investigated, one coating with a low porosity level (< 3 %) and 1 wt.% Al2O3 representing traditional EBCs; and two coatings with higher porosity levels (~20 %) representing abradable EBCs. Phase composition and microstructural evolution were studied in order to reveal the underlying mechanism for the interaction between high temperature steam and ytterbium disilicate. The results show depletion of Yb2SiO5 near the surface and formation of ytterbium garnet (Yb3Al5O12) on top of all three coatings due to the reaction with gaseous Al-containing impurities coming from the alumina furnace tubes. The 1 wt.% Al2O3 added to the EBC sample exacerbated the formation of garnet at 1400 °C compared to the abradable samples, which presented lower quantities of garnet. Additionally, inter-splat boundaries were visible after exposure, indicating preferential ingress of gaseous Al-containing impurities through the splat boundaries.

show abstract

A review on environmental barrier coatings: History, current state of the art and future developments

Cited by 276 publications

References 98 publications

Interaction of multicomponent disilicate (Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7 with molten calcia-magnesia-aluminosilicate

Interaction of multicomponent disilicate (Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7 with molten calcia-magnesia-aluminosilicate

Simulation of the HiPowAR power generation system for steam-nitrogen expansion after ammonia oxidation in a high-pressure oxygen membrane reactor

Steam Degradation of Ytterbium Disilicate Environmental Barrier Coatings: Effect of Composition, Microstructure and Temperature

Contact Info

Product

Resources

About