High temperature corrosion of (Er0.25Tm0.25Yb0.25Lu0.25)2Si2O7 environmental barrier coating material subjected to water vapor and molten calcium–magnesium–aluminosilicate (CMAS)

Sun, Luchao; Luo, Yixiu; Zhao, Tian; Du, Tao-Yuan; Ren, Xiaomin; Li, Jialin; Hu, Wenqiang; Zhang, Jie; Wang, Jiemin

doi:10.1016/j.corsci.2020.108881

Cited by 98 publications

(60 citation statements)

References 34 publications

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“…Basically, thermal expansion of materials originates from anharmonic vibration of lattice at finite temperatures, which is closely related to the bond strength of chemical bond. Since the TECs of HE [22], YSZ [22,62], REPO 4 (RE = Nd, Sm, Gd) [62], Ba 2 REAlO 5 (RE = Yb, Er, Dy) [63], and high-entropy RE 2 Si 2 O 7 [64].…”

Section: Thermal Properties Of Bulk He Re 2 Omentioning

confidence: 99%

Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE2O3 (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al2O3f/Al2O3 composites

et al. 2021

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Y2O3 is regarded as one of the potential environmental barrier coating (EBC) materials for Al2O3f/Al2O3 ceramic matrix composites owing to its high melting point and close thermal expansion coefficient to Al2O3. However, the relatively high thermal conductivity and unsatisfactory calcium-magnesium-aluminosilicate (CMAS) resistance are the main obstacles for the practical application of Y2O3. In order to reduce the thermal conductivity and increase the CMAS resistance, four cubic bixbyite structured high-entropy oxides RE2O3, including (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3, (Sm0.2Er0.2Lu0.2Y0.2Yb0.2)2O3, (Sm0.2Eu0.2Er0.2Y0.2Yb0.2)2O3, and (Sm0.2Eu0.2Lu0.2Y0.2Yb0.2)2O3 were designed and synthesized, among which (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 and (Sm0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 bulks were prepared by spark plasma sintering (SPS) to investigate their mechanical and thermal properties as well as CMAS resistance. The mechanical properties of (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 and (Sm0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 are close to those of Y2O3 but become more brittle than Y2O3. The thermal conductivities of (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 and (Sm0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 (5.1 and 4.6 W·m−1·K−1) are only 23.8% and 21.5% respectively of that of Y2O3 (21.4 W·m−1·K−1), while their thermal expansion coefficients are close to those of Y2O3 and Al2O3. Most importantly, HE RE2O3 ceramics exhibit good CMAS resistance. After being attacked by CMAS at 1350 °C for 4 h, the HE RE2O3 ceramics maintain their original morphologies without forming pores or cracks, making them promising as EBC materials for Al2O3f/Al2O3 composites.

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Section: Thermal Properties Of Bulk He Re 2 Omentioning

confidence: 99%

Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE2O3 (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al2O3f/Al2O3 composites

et al. 2021

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“…The concept was extended to ceramics, including oxides [21][22][23], borides [24][25][26][27], carbides [28][29][30], and silicide [31,32]. Through the high-entropy effect, these ceramics showed improved mechanical properties [26,[28][29][30]33,34], thermophysical properties [34][35][36][37][38][39], and robust corrosion resistance [40][41][42]. The recently developed multicomponent RE-disilicates [41][42][43][44] also showed better water vapor resistance at high temperatures, lower thermal conductivity, and better mechanical properties than the individual RE-disilicates, attributed to the high-entropy effect.…”

Section: Introduction mentioning

confidence: 99%

“…Through the high-entropy effect, these ceramics showed improved mechanical properties [26,[28][29][30]33,34], thermophysical properties [34][35][36][37][38][39], and robust corrosion resistance [40][41][42]. The recently developed multicomponent RE-disilicates [41][42][43][44] also showed better water vapor resistance at high temperatures, lower thermal conductivity, and better mechanical properties than the individual RE-disilicates, attributed to the high-entropy effect. Especially, Sun et al [44] reported that a multicomponent γ-type (Gd 1/6 Tb 1/6 Dy 1/6 Tm 1/6 Yb 1/6 Lu 1/6 ) 2 Si 2 O 7 disilicate presented no polymorph transition until melting point.…”

Section: Introduction mentioning

confidence: 99%

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

et al. 2021

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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.

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“…Most recently (after the initial submission of this manuscript), Sun et al reported a study of the CMAS resistance of a high‐entropy disilicate, (Er 0.25 Tm 0.25 Yb 0.25 Lu 0.25 ) 2 Si 2 O 7 57 . They reported excellent stability of the material and grain boundaries at 1500°C in contact with molten CMAS, and they further argued improved performance in comparison with the constituent disilicates.…”

Section: Resultsmentioning

confidence: 99%

“…The authors attributed this enhanced performance to entropy stabilization. However, it should also be noted that Sun et al compared the performance of their high‐entropy disilicates 57 to experiments on the constituent disilicates found in literature as opposed to measuring them under identical experimental conditions. The OB of this high‐entropy disilicate is approximately 0.70, which is substantially lower than those of 8YSZ (0.87) and our CCFOs (0.88‐0.91) and closer to that of CMAS (0.64).…”

Section: Resultsmentioning

confidence: 99%

Sand corrosion, thermal expansion, and ablation of medium‐ and high‐entropy compositionally complex fluorite oxides

et al. 2020

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Sand corrosion, thermal expansion, and ablation properties of a new class of medium-and high-entropy compositionally complex fluorite oxides (CCFOs) are examined as potential protective coating materials. Five binary oxides were mixed and sintered into dense, single-phase CCFOs of the general formula: [Hf (1-2x)/3 Zr (1-2x)/3 Ce (1-2x)/3 Y x Yb x ]O 2-δ (x = 0.2, 0.074, and 0.029). These CCFOs exhibit decreased molten sand infiltration and interaction at intermediate temperatures (1200-1300°C) in comparison with a cubic yttria-stabilized zirconia (YSZ) reference; however, at higher temperatures, the trend is reversed due to the increased chemical reactivity. The equimolar high-entropy (Hf 0.2 Zr 0.2 Ce 0.2 Y 0.2 Yb 0.2)O 2-δ exhibits no grain boundary penetration by molten sand at all examined temperatures (1200°C-1500°C), although reaction and precipitation are significant. Moreover, these CCFOs exhibit higher intrinsic thermal expansion coefficients (CTE) than the YSZ reference, thereby being more compatible with Ni-based superalloys. The 8YSZ-like (Hf 0.284 Zr 0.284 Ce 0.284 Y 0.074 Yb 0.074)O 2-δ exhibits the highest CTE in this series of CCFOs due to oxygen clustering effects. Finally, these CCFOs also exhibit lower emissivities and form unique faceted microstructures in ablative environments.

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High temperature corrosion of (Er0.25Tm0.25Yb0.25Lu0.25)2Si2O7 environmental barrier coating material subjected to water vapor and molten calcium–magnesium–aluminosilicate (CMAS)

Cited by 98 publications

References 34 publications

Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE2O3 (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al2O3f/Al2O3 composites

Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE2O3 (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al2O3f/Al2O3 composites

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

Sand corrosion, thermal expansion, and ablation of medium‐ and high‐entropy compositionally complex fluorite oxides

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