High-temperature performances of Si-HfO2-based environmental barrier coatings via atmospheric plasma spraying

Ding, Qianjing; Tan, Xi; Jiang, Linwen; Fan, Xinggang; He, Bing; Wang, Chao; Zhuo, Xueshi; Zhou, Kesong; Fan, Jiafeng

doi:10.1016/j.ceramint.2022.04.293

Cited by 18 publications

(5 citation statements)

References 37 publications

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“…However, Figure 3c,d clearly show that after annealing at 1250 • C, a thin film appeared on the surface and that the submicronic particles gradually combined with the silicon layer. This combination can be explained by references [27,28], which reported the possibility of SiO 2 /silicon decomposition via the apparent reaction of Si + SiO 2 → 2SiO when the oxygen pressure at high temperatures is low. However, it is believed that the reoxidation reaction 2SiO + O 2 → 2SiO 2 occurred rapidly because of the atmospheric annealing conditions.…”

Section: Surface Microstructuresmentioning

confidence: 87%

Evolution of the Microstructure and Mechanical Performance of As-Sprayed and Annealed Silicon Coating on Melt-Infiltrated Silicon Carbide Composites

et al. 2023

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In this study, silicon coating was deposited on melt-infiltrated SiC composites using atmospheric plasma spraying and then annealed at 1100 and 1250 °C for 1–10 h to investigate the effect of annealing on the layer. The microstructure and mechanical properties were evaluated using scanning electron microscopy, X-ray diffractometry, transmission electron microscopy, nano-indentation, and bond strength tests. A silicon layer with a homogeneous polycrystalline cubic structure was obtained without phase transition after annealing. After annealing, three features were observed at the interface, namely β-SiC/nano-oxide film/Si, Si-rich SiC/Si, and residual Si/nano-oxide film/Si. The nano-oxide film thickness was ≤100 nm and was well combined with SiC and silicon. Additionally, a good bond was formed between the silicon-rich SiC and silicon layer, resulting in a significant bond strength improvement from 11 to >30 MPa.

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Section: Surface Microstructuresmentioning

confidence: 87%

Evolution of the Microstructure and Mechanical Performance of As-Sprayed and Annealed Silicon Coating on Melt-Infiltrated Silicon Carbide Composites

et al. 2023

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“…A high HfO 2 content inevitably results in the continuous distribution of HfO 2 and HfSiO 4 , thus reducing its oxidation resistance. In addition, the coefficient of thermal expansion (CTE) of HfO 2 is 6.46×10 -6 -7.72×10 -6 K -1 [15][16][17]22], which is higher than that of SiC f /SiC CMCs [10]. Therefore, a higher HfO 2 content produces a greater thermal mismatch stress during thermal cycling, causing premature cracking and delamination [15,18].…”

Section: Design Of the Si-hfo Dual-state Duplex Composite Structurementioning

confidence: 99%

“…These findings emphasize the importance of maintaining a discrete distribution of the HfO 2 phase for enhanced oxidation resistance. Moreover, the coefficients of thermal expansion (CTEs) of the pure HfO 2 and Si-HfO 2 composites are 5.8×10 -6 K -1 and 5×10 -6 -6×10 -6 K -1 [15][16][17]22], respectively, both of which are greater than those of SiC f /SiC CMCs [10]. This suggests potential tensile stresses in the composite during thermal cycling, leading to vertical cracking and interfacial delamination [18].…”

Section: Implications For More Durable Ebcsmentioning

confidence: 99%

“…4 and 8). This phase separation is not conducive to inhibiting phase-transition-induced cracking and may lead to the formation of a fluorite-structured HfO 2 phase (F SS -HfO 2 ) at the HfO 2 /Yb 2 Si 2 O 7 interface [22,38]. The CTE of F SS -HfO 2 is much larger than that of the m-HfO 2 and SiC substrates, causing premature spallation of the EBCs.…”

Section: Implications For More Durable Ebcsmentioning

confidence: 99%

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Durable dual-state duplex Si–HfO ₂ with excellent oxidation and cracking resistance

Chen,

Luo,

Yang

et al. 2024

Journal of Advanced Ceramics

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The lifetime of Si bond coatings in environmental barrier coatings is constrained by phase-transition-induced cracking of the SiO 2 scale. In this study, Si-HfO 2 dual-state duplex composite materials are proposed to address this issue by partially forming HfSiO 4 and minimizing the SiO 2 content. The as-prepared composite exhibited a structure comprising discrete HfO 2 "bricks" embedded in a continuous Si "mortar", while the oxidized state transformed into discrete HfSiO 4 "bricks" within continuous thin SiO 2 "mortars". The results indicate that continuous thin SiO 2 contributes to reducing the oxidation rate to a level comparable to that of pure Si, and discrete HfSiO 4 particles aid in relieving phase transition-induced stress and inhibiting crack propagation, thereby enhancing oxidation and cracking resistance simultaneously. Consequently, the composite with 20 mol% HfO 2 and a mean particle size of ~500 nm at 1370 ℃ exhibited a service lifetime 10 times greater than that of pure Si. This research provides valuable insights for designing Si-based bond coatings with improved service lifetime.

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“…When water cooling was introduced, on the one hand, a higher cooling rate was provided, and on the other hand, the effect of water on the EBCs system was also involved. Ding et al 88 prepared the Si-HfO 2 /Yb 2 S 2 O 7 /Yb 2 SiO 5 EBCs system with different ratios of Si and HfO 2 using the APS process to explore their high-temperature performance. Samples were heated to 1300 • C for 10 min and then placed in deionized water for sudden cooling.…”

Section: Thermal Shockmentioning

confidence: 99%

Evaluation of environmental barrier coatings: A review

Xiao

Li²,

Huang

et al. 2023

Int J Applied Ceramic Tech

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Environmental barrier coatings (EBCs) greatly improve the service performance of SiC‐based ceramic matrix composites (CMCs) in high‐temperature combustion chambers. Working environments with physical ablation, high temperature, and chemical corrosion require the performance of designed EBC materials and/or structures to be properly evaluated before their real applications. In this paper, EBCs’ lifetime‐related phase stability, chemical compatibility, and microstructure retainability are discussed. And then, evaluation methods for basic and environmental properties of EBCs are thoroughly reviewed with newly proposed methods and improved techniques. Pros and cons of each method along with some potential strategies/techniques are also provided. We hope this article can give a timely and overall review for efficient and effective evaluation of EBCs and provide guidance not only for beginners but also for seasoned researchers when they design and develop high‐performance EBC systems.

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High-temperature performances of Si-HfO2-based environmental barrier coatings via atmospheric plasma spraying

Cited by 18 publications

References 37 publications

Evolution of the Microstructure and Mechanical Performance of As-Sprayed and Annealed Silicon Coating on Melt-Infiltrated Silicon Carbide Composites

Evolution of the Microstructure and Mechanical Performance of As-Sprayed and Annealed Silicon Coating on Melt-Infiltrated Silicon Carbide Composites

Durable dual-state duplex Si–HfO ₂ with excellent oxidation and cracking resistance

Evaluation of environmental barrier coatings: A review

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High-temperature performances of Si-HfO2-based environmental barrier coatings via atmospheric plasma spraying

Cited by 18 publications

References 37 publications

Evolution of the Microstructure and Mechanical Performance of As-Sprayed and Annealed Silicon Coating on Melt-Infiltrated Silicon Carbide Composites

Evolution of the Microstructure and Mechanical Performance of As-Sprayed and Annealed Silicon Coating on Melt-Infiltrated Silicon Carbide Composites

Durable dual-state duplex Si–HfO 2 with excellent oxidation and cracking resistance

Evaluation of environmental barrier coatings: A review

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Product

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Durable dual-state duplex Si–HfO ₂ with excellent oxidation and cracking resistance