Iranian Journal of Ceramic Science & Engineering
Volume 13, Issue 3 (10-2024)
2024, 13(3): 0-0 |
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Mashhadi M, farhang rad F. Effect of ZrC-SiC Composite Coating on the Physical Properties and Oxidation Resistance of Carbon/Carbon Composites Prepared by Pack Cementation. Iranian Journal of Ceramic Science & Engineering 2024; 13 (3)
URL: http://ijcse.ir/article-1-1002-en.html
URL: http://ijcse.ir/article-1-1002-en.html
1- , me_mashadi@yahoo.com
Abstract: (11 Views)
Carbon/carbon (C/C) composites are considered advanced materials due to their low density, high strength-to-weight ratio, excellent thermal shock resistance, and extremely high melting point. However, their poor oxidation resistance at temperatures above 500 °C necessitates the application of protective coatings. In this study, ultra-high-temperature ceramic coatings (ZrC, SiC, and HfC) were applied to carbon/carbon composites by pack cementation method using precursor-based involving zirconium oxide/silicon/active carbon, hafnium oxide/silicon/active carbon, and zircon/active carbon precursors. The optimal synthesis compositions for the carbides were first determined: ZrC achieved the best results with a carbon-to-ZrO₂ molar ratio of 4.8, while HfC performed optimally at a carbon-to-HfO₂ ratio of 5.2 (processed at 1700 °C for 90 minutes under an argon atmosphere). The coatings were fabricated via the pack cementation (PC) process, and the desired phases were confirmed through XRD and SEM analyses. Oxidation testing using an oxyacetylene torch at approximately 2200 °C for 60 seconds revealed distinct performance differences among the coatings. The coating derived from ZrO₂ + Si + Cactive demonstrated the best resistance to oxidative ablation, achieving the lowest linear erosion rate of 1.88 µm/s. The coating prepared from ZrSiO₄ + Cactive ranked second with a slightly higher erosion rate of 2.16 µm/s, while the HfC/SiC coating obtained from HfO₂ + Si + Cactive precursors exhibited significant degradation during the test and provided substantially lower protection compared to the other samples.
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