Improvement of the mechanical properties of SiC reticulated porous ceramics with optimized three-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. Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, India;2. Vikram Sarabhai Space Center, Thiruvananthapuram 695 547, India;1. High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;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. School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China;2. Department of Mechanical Engineering, University of Canterbury, Christchurch, 8140, New Zealand |
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| Abstract: | Silicon carbide reticulated porous ceramics (SiC RPCs) with three-layered struts were fabricated by polymer replica method, followed by infiltrating alumina slurries containing silicon (slurry-Si) and andalusite (slurry-An), respectively. The effects of composition of infiltration slurries on the strut structure, mechanical properties and thermal shock resistance of SiC RPCs were investigated. The results showed that the SiC RPCs infiltrated with slurry-Si and slurry-An exhibited better mechanical properties and thermal shock resistance in comparison with those of alumina slurry infiltration, even obtained the considerable strength at 1300 °C. In slurry-Si, silicon was oxidized into SiO2 in the temperature range from 1300 °C to 1400 °C and it reacted with Al2O3 into mullite phase at 1450 °C. Meantime, the addition of silicon in slurry-Si could reduce SiC oxidation of SiC RPCs during firing process in contrast with alumina slurry. With regard to slurry-An, andalusite started to transform into mullite phase at 1300 °C and the secondary mullitization occurred at 1450 °C. The enhanced mechanical properties and thermal shock resistance of SiC RPCs infiltrated alumina slurries containing silicon and andalusite were attributed to the optimized microstructure and the triangular zone (inner layer of strut) with mullite bonded corundum via reaction sintering. In addition, the generation of residual compressive stress together with better interlocked needle-like mullite led to the crack-deflection in SiC skeleton, thus improving the thermal shock resistance of obtained SiC RPCs. |
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| Keywords: | SiC reticulated porous ceramics Reaction sintering Mechanical properties Thermal shock resistance |
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