Fabrication of SiC reticulated porous ceramics with multi-layered struts for porous media combustion |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Institute of Thermal Engineering, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China;3. Technical University Bergakademie Freiberg, Institute for Ceramic, Glass, and Construction Materials, Agricolastraße 17, 09596 Freiberg, Germany;1. CEIT and Tecnun (University of Navarra), Manuel de Lardizábal 15, 20018 San Sebastián, Spain;2. CIEMAT, Avenida Complutense 22, 28040 Madrid, Spain;3. Institut Químic de Sarrià, University Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain;1. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang, China;2. Berzelii Center EXSELENT on Porous Materials, Stockholm University, S-106 91 Stockholm, Sweden;3. Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, China;1. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, PR China;2. China Academy of Launch Vehicle Technology, Beijing, 100076, PR China;1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;2. Chongqing Minghao Pipe Industry Co, Ltd. Chongqing, PR China;3. School of Materials Science and Engineering, Henan Key Laboratory of Special Protective Materials, Luoyang Institute of Science and Technology, Luoyang, Henan 471023, PR China;4. School of Energy Science and Engineering, University of Electronic Science and Technology of China, 2006 Xiyuan Road, Chengdu, PR China;5. Department of Materials Science and Engineering, University of Ioannina, GR-451 10 Ioannina, Greece |
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| Abstract: | Silicon carbide reticulated porous ceramics (SiC RPCs) with multi-layered struts were fabricated at 1450 °C by polymer sponge replica technique, followed by vacuum infiltration. The effect of additives (polycarboxylate, ammonium lignosulfonate and sodium carboxymethyl-cellulose) on the rheological behavior of silicon carbide slurry was firstly investigated, and then the slurry was coated on polyurethane open-cell sponge template. Furthermore, alumina slurry was adopted to fill up the hollow struts in vacuum infiltration process after the coated sponge was pre-treated at 850 °C. The results showed that the coating thickness on the struts and the microstructure in SiC RPCs were closely associated with the solid content of alumina slurry during vacuum infiltration. The typical multi-layered strut of SiC RPCs could be achieved after the infiltration of an alumina slurry containing 77 wt% solid content. The compressive strength and thermal shock resistance of the infiltrated specimens were significantly improved in comparison with those of non-infiltrated ones. The improvement was attributed to the in-situ formation of reaction-bonded multilayer struts in SiC RPCs, which were characterized by the exterior coating of aluminosilicate-corundum, middle part of mullite bonded SiC and interior zone of corundum. |
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| Keywords: | SiC reticulated porous ceramics Rheological properties Multi-layered struts Mechanical properties Thermal shock resistance |
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