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5. Bonding strength of environmental barrier coatings on surface of SiC-based ceramic matrix composites

Author

SU Chaoqun, DENG Longhui, LIU Ruoyu, JIANG Jianing, YUN Haitao, LI Gui, MIAO Xiaofeng, CHEN Wenbo, YI Chushan, LIU Li, DONG Shujuan, and CAO Xueqiang

Subjects
sic, composite, environmental barrier coatings, bonding strength, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

SiC-based ceramic matrix composites (SiC-CMC) are an ideal material for aeroengines with high thrust/mass ratio.In order to prevent the corrosion of SiC-CMC by gas (rich in H2O and O2) in the engine, it is necessary to prepare environmental barrier coatings (EBCs) with excellent water and oxygen corrosion resistance, gas erosion resistance and thermal shock resistance. Among many factors that evaluate the performance of EBCs, the bonding strength between EBCs and SiC-CMC matrix is an important indicator, but the limit value of the bonding strength has not been clearly explored.In this paper, main factors to control the bonding strength were studied in order to reach the highest value, including the SiC-CMC matrix state, the tensile strength limit of single crystal Si, and the preparation process of the Si bonding layer, etc. In the SiC-CMC/EBCs system, the interface between the SiC fiber cloth is the weakest part of the bonding strength, followed by the Si bonding layer. The bonding strength limit is 15 MPa, which is the tensile strength limit of single crystal Si in the [400] crystal direction. The bonding strength of the Si layer using atmospheric plasma spraying (APS) or high velocity oxygen-fuel(HVOF) is similar, which is lower than that of mullite or Yb2Si2O7 layer sprayed by the same process.

Published
2024
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41. Feasibility research of perovskite‐type PrAlO3+δ as high‐temperature infrared radiation coating.

Author

Xu, Mingyi, Chen, Wenbo, Lü, Kaiyue, Huang, Yan, Deng, Longhui, Jiang, Jianing, Dong, Shujuan, Cao, Xueqiang, Lu, Guoqiang, and Zhang, Yixing

Subjects
PLASMA spraying, SURFACE coatings, HEAT radiation & absorption, INFRARED radiation, THERMAL conductivity, THERMAL expansion
Abstract

Thermal radiation coating with low thermal conductivity and high infrared emissivity are desirable. In this work, a novel rare‐earth aluminate (PrAlO3+δ with rhombohedral structure) was synthesized via solid‐state reaction method, and the corresponding coating was fabricated using atmospheric plasma spraying (APS). The study encompassed an investigation into the phase structure, high‐temperature phase stability, thermo‐mechanical characteristics, and infrared properties. The results illustrate that as‐deposited coating contained amorphous phase, but recrystallized coating presented phase stability up to 1600°C. Furthermore, the recrystallized coating exhibited low thermal conductivity of 1.35 W/m K at 900°C as well as an average coefficient of thermal expansion of 10.36 × 10−6/K. Also, the coating exhibited high infrared emissivity related to high valance state (Pr4+) and oxygen vacancies. And the average infrared emissivity within 2–14 µm was 0.822 at 1300°C and presented slight decrease with the increase of temperature (the average infrared emissivity of 0.795 at 1800°C). [ABSTRACT FROM AUTHOR]

Published
2024
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45. Corrigendum to “Proposition of a robot-based free diamond abrasive grinding process and its influence on the characteristics of plasma-sprayed 8YSZ coatings” [J Mater Res Technol 26, September–October 2023, pages 4423–4435]

Author

Chen, Tingyang, primary, Dong, Shujuan, additional, Deng, Chunming, additional, Zhang, Xiaofeng, additional, Jiang, Jianing, additional, Deng, Longhui, additional, Cai, Zhenhua, additional, and Cao, Xueqiang, additional

Published
2024
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