Thermal shock resistance and bonding strength of tri-layer Yb2SiO5/mullite/Si coating on SiCf/SiC composites |
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| Affiliation: | 1. National Engineering Laboratory for Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, 510651, PR China;2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, PR China;1. School of Materials Science and Engineering, Beihang University, Beijing, China;2. Key Laboratory of High-temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology), Beihang University, Beijing, China;3. Research Institute for Frontier Science, Beihang University, Beijing, China |
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| Abstract: | A Yb2SiO5/mullite/Si tri-layer environmental-barrier-coating (EBC) were coated on SiCf/SiC substrates via Air Plasma Spraying (APS). The thermal cycle tests (TCT) were conducted under thermal corrosive condition of vapor-oxygen (50 vol% H2O and 50 vol% O2) with thermal shock from 1200 °C to 200 °C. Microstructures, weight loss and bonding strength of the samples were systemically investigated after 101, 396, 606 and 700 TCT cycles respectively. The results show that the corner of the tri-layer coating peel off from the sample with weight loss of 1.3% after 700 TCT cycles. The bonding strength between substrate and tri-layer coatings gradually decreases to 6.79 MPa (approximately 55.2% of virgin specimens) after 700 cycles due to thermal shock induced cracks distributed horizontally within Si layers and between Si layer and outer layers. |
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| Keywords: | Environmental barrier coating Ytterbium silicates Thermal cycle test |
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