Ablation performance of rare earth oxide (REO)-stabilized tetragonal and cubic zirconia coatings as a thermal protection system (TPS) for carbon/carbon composites |
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| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Xiangyang 441000, China;3. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;4. Jingdezhen Huaxun Special Ceramics Co. Ltd., Jingdezhen 333000, China;1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;1. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, PR China;2. Advanced Technology & Materials Co., Ltd., Beijing 100081, PR China;3. School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;1. Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6–1 Kasuga-koen, Kasuga-shi, Fukuoka 816-8580, Japan;2. Research Center for Structural Materials, National Institute for Materials Science, 1–2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;3. Research Network and Facility Services Division, National Institute for Materials Science, 1–2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;4. Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2–4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan;1. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;2. School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an, Shaanxi 710048, China;3. State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China |
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| Abstract: | To protect carbon/carbon (C/C) composites from severe oxidation and ablation at temperatures exceeding 500 ℃ during the hypersonic applications, a novel Sm2O3-stabilized ZrO2 coating is applied using atmospheric plasma spray. The surface was pre-treated with an oxyacetylene flame to increase the surface roughness and, therefore, to create geometric textures known as anchors. The non-equilibrium tetragonal (t΄) ZrO2 coating stabilized with 6 mol% Sm2O3 offered the best ablation resistance, with survivability maintained through 120 s of ∼390 W/cm2 heat flux oxyacetylene ablation heating without any denudation from the C/C substrate. The coating significantly improved the ablation resistance of C/C by reducing the mass ablation rate by ∼71% and the linear ablation rate by ∼94%. Despite a significant thermal expansion coefficient mismatch between the substrate and the coating, a well-defined mechanical adhesion characterized by the anchors was observed in pre- and post-ablated coating microstructures, indicating its influence in improving ablation resistance. |
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| Keywords: | Hypersonic materials Carbon/carbon Thermal protection system (TPS) Ablation Plasma sprayed coating |
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