Abstract
To address the industrial usage of carbon/carbon (C/C) substrates with plasma-sprayed ZrB2/SiC coatings, a continuous and dense chemical vapor deposition (CVD)-SiC interlayer of 150 µm was deposited on a C/C substrate. The integration of CVD-SiC with the C/C substrate and plasma sprayed (PS) ZrB2/SiC coatings results in a tight interface. The SiC interlayer significantly reducing thermal stress in the optimized composites up to 1828 Mpa, a decrease of approximately 60% compared to standard composites without CVD-SiC. Ablation tests conducted showed that the optimized composite displayed remarkable mass ablation rate of − 11.7% after ablation for 600 s, with a notable increase of − 3.5% even after ablation for 1800 s. After 600 s of ablation, the exposed SiO2 layer is approximately 500 µm in size. After 900 s of ablation, the exposed SiO2 layer is approximately 1500 µm. After 1800 s of ablation, the SiO2 is completely evaporated, exposing the C/C matrix, at which point the coating has failed. The SiC interlayer improve the ablation resistance due to the continuous SiO2 film formed by the self-sealing and O anti-diffusive properties.
Original language | English |
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Article number | 106591 |
Journal | Materials Today Communications |
Volume | 36 |
DOIs | |
Publication status | Published - Aug 2023 |
Keywords
- Ablation resistance
- C/C substrate
- CVD-SiC interlayer
- Plasma spraying