Achieving high permeability of in-situ formed lightweight Cf/SiC(rGO)px/SiC porous ceramics with improved interfacial compatibility for transpiration cooling |
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| Affiliation: | 1. Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China;2. Fujian Key Laboratory of Advanced Materials (Xiamen University), Xiamen 361005, China;3. Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen 361005, China;1. Division of Nonmetallic-Inorganic Materials, Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287 Darmstadt, Germany;2. Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;1. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China;2. College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China;1. State Key laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China |
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| Abstract: | Making lightweight porous ceramics with excellent permeability applied for transpiration cooling is still challenging. Herein, an ingenious fabrication method is proposed to successfully prepare Cf/SiC(rGO)px/SiC porous ceramics possessing low density, high permeability and satisfactory mechanical properties. The introduction of carbon fibers for constructing channels and SiC(rGO)p with three-dimensional (3D) honeycomb cellular net-like structure, could effectively decrease density and improve porosity. Meanwhile, self-supporting porous skeleton, high open porosity and uniform pores distribution contribute to brilliant permeability of the products. Good interfacial compatibility among SiC(rGO)p, carbon fibers and β-SiC/SiOxCy/Cfree matrix, as well as toughening effects of carbon fibers are beneficial for enhancing fracture toughness and compressive strength. Particularly, Cf/SiC(rGO)p0.6/SiC porous ceramics exhibit low density (1.12 g·cm?3), low linear shrinkage (3.22%), especially high permeability (1.36 ×10?7 mm2), satisfactory fracture toughness (1.77 MPa·m1/2), excellent hardness (3.88 GPa) and compressive strength (6.41 MPa), focusing on potential applications as coolant medium in transpiration cooling. |
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| Keywords: | Porous ceramics Permeability Precursors SiC Carbon fibers |
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