A comprehensive study on the mechanical properties of Yb2SiO5 as a potential environmental barrier coating

Kassem, Reem; Nasiri, Nasrin Al

doi:10.1016/j.surfcoat.2021.127783

Cited by 24 publications

(5 citation statements)

References 35 publications

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“…From Fig. 11(a), it is noteworthy that the TEC of CrTaO 4 is much lower than that of currently investigated TBC materials [42,54−56] on superalloys, such as YSZ (10.5×10 −6 K −1 ), Tm 4 Hf 3 O 12 (9.57×10 −6 K −1 ), La 2 Hf 2 O 7 (8.76×10 −6 K −1 ), Yb 3 A l5 O 12 (8.22×10 −6 K −1 ), Y 4 Al 2 O 9 (7.51×10 −6 K −1 ), La 2 Zr 2 O 7 (9×10 −6 K −1 ) and BaZrO 3 (7.72×10 −6 K −1 ) but higher than that of SiC (4.94×10 −6 K −1 ) [36], mullite (5.18×10 [59], and other rare earth silicates [60]. Of particular interest, the TEC of CrTaO 4 is close to some refractory alloys such as Ta (6.3×10 −6 K −1 ) and Nb (7.3×10 −6 K −1 ) [2] and UHTCs such as ZrB 2 (6.8×10 −6 K −1 ), HfB 2 (6.3×10 −6 K −1 ) [61], ZrC (6.9×10 −6 K −1 ), NbC (6.8×10 −6 K −1 ), and TaC (6.6×10 −6 K −1 ) [62].…”

Section: Discussionmentioning

confidence: 97%

Microstructure, elastic/mechanical and thermal properties of CrTaO ₄: A new thermal barrier material?

Zhang,

Wang,

Zhang

et al. 2024

Journal of Advanced Ceramics

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CrTaO 4 (or Cr 0.5 Ta 0.5 O 2 ) has been unexpectedly found to play a decisive role in improving the oxidation resistance of Cr and Ta-containing refractory high-entropy alloys (RHEAs). This rarely encountered complex oxide can effectively prevent the outward diffusion of metal cations from the RHEAs. Moreover, the oxidation kinetics of CrTaO 4forming RHEAs is comparable to that of the well-known oxidation resistant Cr 2 O 3 -and Al 2 O 3 -forming Ni-based superalloys. However, CrTaO 4 has been ignored and its mechanical and thermal properties have yet to be studied. To fill this research gap and explore the untapped potential for its applications, here we report for the first time the microstructure, mechanical and thermal properties of CrTaO 4 prepared by hot-press sintering of solid-state reaction synthesized powders. Using the HAADF and ABF-STEM techniques, rutile crystal structure was confirmed and short range ordering was directly observed. In addition, segregation of Ta and Cr was identified. Intriguingly, CrTaO 4 exhibits elastic/mechanical properties similar to those of yttria stabilized zirconia (YSZ) with Young's modulus, shear modulus, and bulk modulus of 268, 107, and 181 GPa, respectively, and Vickers hardness, flexural strength, and fracture toughness of 12.2±0.44 GPa, 142±14 MPa, and 1.87±0.074 MPa•m 1/2 . The analogous elastic/mechanical properties of CrTaO 4 to those of YSZ has spurred inquiries to lucrative leverage it as a new thermal barrier material. The measured melting point of CrTaO 4 is 2103±20 K. The anisotropic thermal expansion coefficients are α a = (5.68±0.10)×10 −6 K −1 , α c = (7.81±0.11)×10 −6 K −1 , with an average thermal expansion coefficient of (6.39±0.11)×10 −6 K −1 . The room temperature thermal conductivity of CrTaO 4 is 1.31 W•m −1 •K −1 and declines to 0.66 W•m −1 •K −1 at 1473 K, which are lower than most of the currently well-known thermal barrier materials. From the perspective of matched thermal expansion coefficient, CrTaO 4 pertains to an eligible thermal barrier material for refractory metals such as Ta, Nb, and RHEAs, and ultrahigh temperature ceramics. As such, this work not only provides fundamental microstructure, elastic/mechanical and thermal properties that are instructive for understanding the protectiveness displayed by CrTaO 4 on top of RHEAs but also outreaches its untapped potential as a new thermal barrier material.

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Section: Discussionmentioning

confidence: 97%

Microstructure, elastic/mechanical and thermal properties of CrTaO ₄: A new thermal barrier material?

Zhang,

Wang,

Zhang

et al. 2024

Journal of Advanced Ceramics

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“…It is worth noting that the large mud crack in LMA-200 extended inward gradually along a direction parallel to the coating surface and terminated at the YbMS/LMA interface instead of the common mode perpendicular to the coating surface. On the one hand, cracks tend to propagate along the path of the least resistance (porosity); on the other hand, this is related to the excellent mechanical properties of YbMS itself, which has higher stress tolerance [42,43]. This crack deflection acts as a toughening mechanism to reduce the risk of damage to the interlayer from thick topcoats with higher stress levels [26,44].…”

Section: Bubble and Glassy Meltmentioning

confidence: 99%

“…Coatings 2024, 14, x FOR PEER REVIEW 9 of 18 resistance (porosity); on the other hand, this is related to the excellent mechanical properties of YbMS itself, which has higher stress tolerance [42,43]. This crack deflection acts as a toughening mechanism to reduce the risk of damage to the interlayer from thick topcoats with higher stress levels [26,44].…”

Section: Bubble and Glassy Meltmentioning

confidence: 99%

Isothermal Oxidation and Thermal Shock Resistance of Thick and Porous LaMgAl11O19 Abradable Topcoat

Huang,

Chen,

et al. 2024

Coatings

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An exploration of the plasma-sprayed abradable sealing coatings (ASCs) of a thick and porous LaMgAl11O19 topcoat onto SiC/SiC ceramic matrix composites (CMCs) is detailed in this study. Interlayers comprising Si/Si + Yb2Si2O7/Yb2SiO5 environmental barrier coatings (EBCs) were strategically employed, considering their function in protecting the SiC/SiC CMCs from recession and mitigating thermal expansivity misfit. An isothermal oxidation test was conducted at 1300 °C and resulted in the formation of bubble and glassy melt on the side surface of the coated sample, while a significant reaction layer emerged at the Yb2SiO5/LaMgAl11O19 interface near the edge. The localized temperature rise caused by the exothermic oxidation of the SiC/SiC substrate was determined to be the underlying factor for bubble generation. The temperature-dependent viscosity of the melt contributed to various bubble characteristics, and due to the enrichment of Al ions, the glassy melt exacerbated the degradation of the Yb2SiO5 layer. After a thermal shock test at 1300 °C, the substrate on the uncoated backside of the sample experienced fracture, while the front coating remained intact. However, due to the presence of a through-coating crack, an internal crack network also developed within the substrate.

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“…Measuring the strain as a function of temperature of bulk samples (i.e. pressed and sintered powders, or free-standing coatings), and assuming isotropic expansion, provides a thermal expansion coefficient representative of a bulk sample (Al Nasiri et al, 2016;Kassem and Al Nasiri, 2021;Ridley et al, 2023).…”

Section: Entire Coating Systemmentioning

confidence: 99%

Characterisation techniques for investigating TBC and EBC failure: a review

Scotson,

Paksoy,

Xiao

2024

Front. Ceram.

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Materials characterisation plays a crucial role in developing thermal barrier coatings and environmental barrier coatings for gas-turbine engines. The failure of thermal barrier coatings and environmental barrier coatings is influenced by a complex interdependence of microstructure, residual stress, and thermomechanical properties. Validating our mechanistic understanding of each of these factors that contribute to failure requires a selection of suitable characterisation techniques. Presented in this review are characterisation techniques, both ex situ and in situ, that have advanced the understanding of thermal barrier coating and environmental barrier coating failure. Targeted coating development that is both effective and efficient depends on these characterisation techniques to obtain superior coatings with improved performance and lifetime.

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A comprehensive study on the mechanical properties of Yb2SiO5 as a potential environmental barrier coating

Cited by 24 publications

References 35 publications

Microstructure, elastic/mechanical and thermal properties of CrTaO ₄: A new thermal barrier material?

Microstructure, elastic/mechanical and thermal properties of CrTaO ₄: A new thermal barrier material?

Isothermal Oxidation and Thermal Shock Resistance of Thick and Porous LaMgAl11O19 Abradable Topcoat

Characterisation techniques for investigating TBC and EBC failure: a review

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A comprehensive study on the mechanical properties of Yb2SiO5 as a potential environmental barrier coating

Cited by 24 publications

References 35 publications

Microstructure, elastic/mechanical and thermal properties of CrTaO 4: A new thermal barrier material?

Microstructure, elastic/mechanical and thermal properties of CrTaO 4: A new thermal barrier material?

Isothermal Oxidation and Thermal Shock Resistance of Thick and Porous LaMgAl11O19 Abradable Topcoat

Characterisation techniques for investigating TBC and EBC failure: a review

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Microstructure, elastic/mechanical and thermal properties of CrTaO ₄: A new thermal barrier material?

Microstructure, elastic/mechanical and thermal properties of CrTaO ₄: A new thermal barrier material?