Microstructure and ablation behaviour of a strong,dense, and thick interfacial ZrxHf1-xC/SiC multiphase bilayer coating prepared by a new simple one-step method |
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| Affiliation: | 1. State Key laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;2. National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha, 410083, China;1. State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China;3. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353, Ko?ice, Slovak Republic;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;2. China Academy of Launch Vehicle Technology, Beijing, 100076, China |
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| Abstract: | In order to solve the shortcomings of chemical vapour deposition (CVD), such as CVD-prepared coatings that are weakly bound to the carbon base, ZrxHf1-xC/SiC multiphase bilayer ceramic coatings were prepared on substrate surfaces by slurry brushing and the one-step in-situ thermal evaporation reaction method. The coating exhibits multiphase bilayer characteristics due to the self-diffusion of the matrix carbon source and the self-assembly of gaseous Zr and Si with the matrix. The 200-μm-thick ZrxHf1-xC solid-solution phase is distributed on the outer coating layer, while the 100-μm-thick SiC phase is distributed in the inner layer such that it contacts the substrate. The coating prepared by brushing with Hf and vapour-deposited with a masterbatch containing 7:3 (w/w) Zr:Si (H-ST) exhibits excellent ablation resistance, attributable to the presence of dense and spallation-free oxide scale and the low oxygen diffusion coefficient of (Zr, Hf)CyOz. |
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| Keywords: | Ablation performance Multiphase bilayer coating Ultrahigh temperature ceramic Mechanical properties |
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